• B

    Bachelor Degree

    Orta Doğu Teknik Üniversitesi, Fen-Edebiyat Fakültesi Fizik Bölümü

  • M

    Master

    Gebze Yüksek Teknoloji Enstitüsü, Fen Bilimleri Enstitüsü, Fizik ABD

  • D

    Doctorate

    Gebze Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Fizik ABD

Articles Published in International Refereed Journals:

     1.  Development of Halbach magnet for portable NMR device

N. Doğan, R. Topkaya, H. Subaşı, Y. Yerli, B. Rameev

J. Physics: Conference Series, 153, 012047, (2009)

 

     2.  Ferromagnetic resonance studies of exchange coupled ultrathin Py/Cr/Py trilayers

     R. Topkaya, M. Erkovan, A. Öztürk, O. Öztürk, B. Aktaş, and M. Özdemir

Journal of Applied Physics, 108 (2), 023910, (2010)

 

     3.  Synthesis and characterization of CuFe2O4 nanorods synthesized by polyol route

T. G. Altınçekic, İ. Boz, A. Baykal, S. Kazan, R. Topkaya, M. S. Toprak

Journal of Alloys and Compounds, 493 (1-2), 493, (2010)

 

     4.  Sonochemical synthesis and chracterization of Mn3O4 nanoparticles

Abdulhadi Baykal, Hüseyin Kavas, Zehra Durmuş, Mine Demir, Sinan Kazan, Ramazan Topkaya, Muhammet S. Toprak

Cent. Eur. J. Chem. 8 (3), 633–638 (2010)

 

5.  Electron Paramagnetic Resonance Characterization of Gamma Irradiation Damage Centers in Powder of L-(+)-Tartaric Acid, D-Alanine and L-Histidine

M. Halim Baskan, Murat Aydın, Şemsettin Osmanoğlu, Ramazan Topkaya

Radiation Effects and Defects in Solids, 165 (12), 938-943 (2010)

 

6.  Investigation of magnetic profile of Fe77Cr2Si5B16 metallic glass by using ferromagnetic resonance (FMR) and vibrating sample magnetometry (VSM) techniques

R. ŞAHİNGÖZ, M. EROL, S. YILMAZ, S. KAZAN, R. TOPKAYA

OPTOELECTRONICS AND ADVANCED MATERIALS, 4 (4), 465, (2010)

 

7.  Magnetic and dielectric properties of Mn0.2Ni0.8Fe2O4 nanoparticles synthesized by PEG-assisted hydrothermal method

Y. Köseoğlu, M. Bay, M. Tan, A. Baykal, H. Sözeri, R. Topkaya, N. Akdoğan

Journal of Nanoparticle Research, 13 (5), 2235-2244 (2011)

 

8.  Size effects and origin of easy-axis in nickel nanowire arrays

G. Kartopu, O. Yalçın, K. L. Choy, R. Topkaya, S. Kazan and B. Aktaş

Journal of Applied Physics, 109, 033909 (2011)

 

9.  Magnetic and dielectric characterization of alginic acid-Fe3O4 nanocomposite

Z. Durmus, H. Sözeri, B. Unal, A. Baykal, R. Topkaya, S.Kazan, M.S. Toprak

Polyhedron, 30 (2), 322-328 (2011)

 

10. EPR and FT-IR spectroscopic studies of L-lysine monohydrochloride and L-glutamic  acid hydrochloride powders

M. Aydin, Z. Kartal, S. Osmanoglu, M.H. Baskan, R. Topkaya

JOURNAL OF MOLECULAR STRUCTURE, 994 (1-3), 150-154 (2011)

 

11. From Metalloligand to Extended 3D Network: Synthesis, Crystal Structure and Magnetic Property of {[Cu(en)2][Cu(μ3-pydc)2] ∙ 6H2O}n

Fatih Semerci, Okan Zafer Yeşilel, Ertan Şahin, Yusuf Yerli, Ramazan Topkaya

J. Inorg. Organomet. Polym. 21, 261–268 (2011)

 

12. Ferromagnetic resonance investigation of Py/Cr multilayer system

M. Erkovan, S. T. Öztürk, R. Topkaya, M. Özdemir, B. Aktaş, O. Öztürk

Journal of Applied Physics, 110 023908 (2011)

 

13. Structural, optical and magnetic properties of Mn diffusion-doped CdS thin films prepared by vacuum evaporation

S. Aksu, E. Bacaksiz, M. Parlak, S. Yılmaz, I. Polat, M. Altunbas¸ M. Türksoy, R. Topkaya, K. Özdoğan Materials Chemistry and Physics 130, 340-345 (2011)

 

14. Complexes Containing N-(2-hydroxyethyl)-ethylenediamine with Tetracyanometallate (II): Synthesis, IR Spectra, Thermal Behavior, Crystal Structure, Magnetic Properties and Catalysis

Ahmet Karadağ, Ayşegül Şenocak, Yusuf Yerli, Ertan Şahin, Ramazan Topkaya

J. Inorg. Organomet. Polym. 22 (2), 369-378 (2012)

 

15. Influence of the annealing atmosphere on structural, optical and magnetic properties of Co-doped ZnO microrods

S. Aksu, E. Bacaksiz, S. Yılmaz, I. Polat, M. Altunbas, M. Türksoy, R. Topkaya, K. Özdoğan

Physica E, 44, 1244–1249 (2012)

 

16. Comparison of the structural and magnetic properties of submicron barium hexaferrite powders prepared by molten salt and solid state calcination routes

Sinan Dursun, Ramazan Topkaya, Numan Akdoğan, Sedat Alkoy

Ceramics International, 38, 3801-3806 (2012)

 

     17. Surface spin disorder and spin-glass-like behaviour in manganese-substituted cobalt ferrite nanoparticles

 R. Topkaya, Ö. Akman, S. Kazan, B. Aktaş¸ Z. Durmus, A. Baykal

 J. Nanopart. Res. 14 (10), 1156 (2012)

 

     18. Magnetisation dynamics of as quenched and pulse annealed soft metallic glasses

 S. Yılmaz, M. Erol, S. Kazan, R. Topkaya, R. Şahingöz

 Materials Research Innovations, 16 (5), 332-337 (2012)

 

     19. Gilbert Damping Constant of Quaternary Co2MnAl1-xSnx Heusler Alloy Thin Films

 Abdullah N. Koçbay, Resul Yilgin, Ramazan Topkaya, Ali Ş. Ahsen, Osman Öztürk, Mustafa  Özdemir, and Bekir Aktaş

Journal of Superconductivity and Novel Magnetism, 25 (8), 2813-2817 (2012)

 

20. Annealing Effect on Structural and Magnetic Properties of Cu2MnAl Heusler Alloy Films

R. Topkaya, N. Akdogan, R. Yilgin, S. Kazan, M. Obaida, H. İnam, K. Westerholt

Journal of Superconductivity and Novel Magnetism, 25 (8), 2605-2609 (2012)

 

    21. Effect of exchange bias on magnetic anisotropies in Fe/CoO bilayers

M. Öztürk E.Demirci, R. Topkaya, S. Kazan, N. Akdoğan, M. Obaida, and K. Westerholt

Journal of Superconductivity and Novel Magnetism, 25 (8), 2597-2603 (2012)

 

    22. Thickness and Temperature Dependence of Exchange Bias in Co/CoO Bilayers

E.Demirci, M. Öztürk, R. Topkaya, S. Kazan, N. Akdoğan, M. Obaida, and K. Westerholt

Journal of Superconductivity and Novel Magnetism, 25 (8), 2591-2595 (2012)

 

23. Magnetic properties of a new N-TEMPO-tert-butyl substituted salicylaldimines and their    biradical palladium(II) complexes

Veli T. Kasumov, Yusuf Yerli, Ramazan Topkaya

Solid State Sciences, 15, 95-101 (2013)

 

24. Yafet-Kittel-type magnetic order in Zn-substituted cobalt ferrite nanoparticles with uniaxial anisotropy

R. Topkaya, A. Baykal, A. Demir

J. Nanopart. Res. 15 (1), 1359 (2013)

 

25. Polymer Assisted Co-precipitation Synthesis and Characterization of Polyethylene Glycol (PEG)/CoFe2O4 Nanocomposite

R. Topkaya, U. Kurtan, A. Baykal, H. Sözeri, M. S. Toprak

J. Inorg. Organomet. Polym. 23 (3), 592-598 (2013)

 

26. Polyvinylpyrrolidone (PVP)/MnFe2O4 nanocomposite:Sol–Gel autocombustion synthesis and its magnetic characterization

 R. Topkaya, U. Kurtan, A. Baykal, M. S. Toprak

 Ceramics International, 39 (5), 5651-5658 (2013)

 

27. Polyaniline (PANI)-Co0.5Mn0.5Fe2O4 nanocomposite: Synthesis, characterization and  magnetic properties evaluation

H. Sozeri, U. Kurtan, R. Topkaya, A. Baykal, M. S. Toprak

Ceramics International, 39 (5) 5137–5143 (2013)

 

28. Temperature dependent magnetic properties of CoFe2O4/CTAB nanocomposite synthesized by sol gel auto-combustion technique

U. Kurtan, R. Topkaya, A. Baykal, M. S. Toprak

Ceramics International, 39 (6) 6551-6558 (2013)

 

29. Sol-gel auto combustion synthesis of CoFe2O4/1-methyl-2-pyrrolidone nanocomposite:  Its magnetic characterization

U. Kurtan, R. Topkaya, S. Esir, A. Baykal

Ceramics International, 39 (6) 6407-6413 (2013)

 

30. Sol–gel auto combustion synthesis of CoFe2O4/1-methyl-2-pyrrolidone nanocomposite with ethylene glycol: Its magnetic characterization

R. Topkaya, U. Kurtan, Y. Junejo, A. Baykal

Materials Research Bulletin, 48 (9), 3247-3253 (2013)

 

31. Facile synthesis of PVA–MnFe2O4 nanocomposite: Its magnetic investigation

S. Shafiu, R. Topkaya, A. Baykal, M. S. Toprak

Materials Research Bulletin, 48 (10), 4066-4071 (2013)

32. Five complexes containing N,N-bis(2-hydroxyethyl)-ethylenediamine with

tetracyanidopalladate(II): synthesis, crystal structures, thermal, magnetic, and catalytic properties

Ş. Aslan Korkmaz, A. Karadağ, N. Korkmaz, Ö. Andaç, N. Gürbüz, İ. Özdemir, R. Topkaya

Journal of Coordination Chemistry, 66 (17), 3072-3091 (2013)

 

33. Green synthesis of superparamagnetic Fe3O4 nanoparticles with maltose: Its magnetic investigation

A. Demir, R. Topkaya, A. Baykal

Polyhedron, 65, 282–287 (2013)

 

34. Sol–gel auto-combustion synthesis of PVP/CoFe2O4 nanocomposite and its magnetic characterization

Materials Research Bulletin 48, 4889–4895 (2013)

U. Kurtan, R. Topkaya, A. Baykal

 

35. Synthesis of Polyaniline–MnFe2O4–CTAB Nanocomposite in Ionic Liquid: Its Magnetic Properties

S. Esir, S. Shafiua, R. Topkaya, A. Baykal

J. Inorg. Organomet. Polym. 23 (6), 1368–1374 (2013)

 

36. Low temperature magnetic investigation of Fe3O4 nanoparticles filled into multiwalled carbon nanotubes

A. Demir, A. Baykal, H. Sözeri, R. Topkaya

Synthetic Metals, 187, 75–80 (2014)

 

37. Ferromagnetic resonance studies of exchange biased CoO/Fe film grown on MgO substrate

Ramazan Topkaya, Sinan Kazan, Resul Yilgin, Numan Akdoğan, Mustafa Özdemir, Bekir Aktaş

J. Supercond. Nov. Magn. 27(6), 1503-1512 (2014)

 

38. FMR Study of Co/Ti Bilayer Thin Films

M. Erkovan, S. Tokdemir Öztürk, D. Taşkın Gazioğlu, R. Topkaya, O. Öztürk

Acta Physica Polonica A, 125(2), 673-676 (2014)

 

39. Polyaniline–MnFe2O4–CTAB Nanocomposite: Low Temperature Magnetic Investigation

A. Baykal, R. Topkaya

J. Supercond. Nov. Magn. 27, 1517-1523 (2014)

 

40. Magnetic Properties of Annealed CoFe2O4 Nanoparticles Synthesized by the PEG-Assisted Route

S. Esir, R. Topkaya, A. Baykal, O. Akman, M. S. Toprak

J. Inorg. Organomet. Polym. 24 (2), 424-430 (2014)

41. Enhancement of exchange bias with crystal orientation in NiFe/CoO and CoO/NiFe bilayers grown on MgO(100) and MgO(111)

R. Topkaya, S. Kazan

J. Magn. Magn. Mater. 368, 300-307 (2014)

 

42. Macrocyclic Cu(II)-organophosphonate building block with room temperature magnetic ordering

A. Bulut, Y. Zorlu, R. Topkaya, B. Aktaş, S. Doğan, H. Kurt and G. Yücesan

Dalton Transactions, 2015, 44, 12526–12529

 

43. The Effect of Milling Time and Sintering Temperature on Crystallization of BaFe12O19 Phase and Magnetic Properties of Ba-Hexaferrite Magnet

G. Sadullahoğlu, B. Ertuğ, H. Gökçe, B. Altuncevahir, M. Öztürk, R. Topkaya, N. Akdoğan, M.L. Öveçoğlu and O. Addemir

Acta Physica Polonica A, 128(3), 377-382 (2015)

 

44. Effect of bimetallic (Ni and Co) substitution on magnetic properties of MnFe2O4 nanoparticles

R. Topkaya, H. Güngüneş, Ş. Eryiğit, Sagar E. Shirsath, A. Yıldız, A. Baykal

Ceramics International, 42, 13773–13782 (2016)

 

45. Effect of temperature on magnetic properties of BaYxFe12-xO19 hexaferrites

R. Topkaya, I.Auwal, A.Baykal

Ceramics International 42, 16296–16302 (2016)


Articles Published in National Refereed Journals:

1. Tunnelling Magnetoresistance at Low Magnetic Fields in LSMO/STO/LSMO Magnetic Tunnel Junction

R. Topkaya,  Iğdır Univ. J. Inst. Sci. & Tech. 7(2): 125-130 (2017).

Papers Presented in International Scientific Meetings and Published in Proceedings:

1.  Two Frequency NQR studies on 14N nuclei

N. Doğan, G.V. Mozzhukhin, B.Z. Rameev, R.R. Khusnutdinov, D.Ya. Osokin, R. Topkaya, H. Subaşı, B. Aktaş

International Conference on Superconductivity and Magnetism (ICSM-2008), August 25-29, 2008, Side- Antalya, Türkiye

 

2.  Development of NMR analyzer device

R. Topkaya, N. Doğan, H. Subaşı, Y.Yerli, B.Rameev

International Conference on Superconductivity and Magnetism (ICSM-2008), August 25-29, 2008, Side- Antalya, Türkiye

 

3.  Interlayer Exchange Coupling in Py/Cr Multilayer Thin Films

B. Aktaş, R.Topkaya, M.Erkovan, M.Özdemir, O.Öztürk

International Conference on Nanostructures and Nanosystems (NANOMAT–09) 10–13 August 2009 Istanbul, Türkiye

 

4.  FMR Investigations on Exchange Coupled Py/Cr/Py trilayer films

B. Aktas, M.Erkovan, R.Topkaya, M.Özdemir, O.Öztürk

20th International Colloquium on Magnetic Films and Surfaces, July 20-24 2009, Berlin, Germany

 

5.  FMR Study on Single Crystalline Co2MnAl Heusler Alloy Thin Films

A. N. Kocbay, R. Yilgin, R. Topkaya, B. Aktaş, M. Oogane, Y. Ando, T. Miyazaki

20th International Colloquium on Magnetic Films and Surfaces, July 20–24 2009, Berlin, Germany

 

6.  Magnetic properties of exchange coupled soft Py/Cr/Py thin trilayer films

Bekir Aktaş, Abdullah N. Koçbay, Ramazan Topkaya, Mustafa Özdemir, Mustafa Erkovan, Osman Öztürk

19th Soft Magnetic Materials Conference, 6-9 September 2009, Torino, Italy

 

7.  Annealing Effect on Gilbert Damping Parameter of Heusler Alloys Thin Films

R. Yilgin, Ramazan Topkaya, Abdullah N. Kocbay, Bekir Aktas,Yuya Sakuraba, Mikihiko Oogane, Yasuo Ando, Terunobu Miyazaki

19th Soft Magnetic Materials Conference, 6-9 September 2009, Torino, Italy

 

 8.  FMR Investigations on Exchange Coupled Py/Cr/Py trilayer films

B. Aktaş, M.Erkovan, R. Topkaya, M. Özdemir, O. Öztürk

5. National Nanotechnology and Nanoscience Conference, Eskişehir, TÜRKIYE, 2009

 

9.  Single Crystalline Co2MnAl Heusler Alloy Thin Films Investigated by FMR

A. N. Kocbay, R. Yilgin, R. Topkaya, B. Aktas, M. Oogane, Y. Ando, T. Miyazaki

5. National Nanotechnology and Nanoscience Conference, Eskişehir, TÜRKIYE, 2009

 

10. FMR Investigations on Exchange Coupled Co/Ti/Co Trilayer Films

 M.Erkovan, B. Aktaş, R. Topkaya, M. Özdemir, O. Öztürk

 5. National Nanotechnology and Nanoscience Conference Eskişehir, TÜRKIYE 2009

 

11. FMR Investigations on Exchange Coupled Py/Cr/Py trilayer films

 B.Aktaş, M.Erkovan, R.Topkaya, M. Özdemir, O. Öztürk

 International Conference on Magnetism, July 26–31, 2009, Karlsruhe, Germany

12. The effect of substrate and annealing temperatures on magnetic properties of Cu2MnAl  Heusler Alloy films

R. Topkaya, N. Akdogan, R. Yilgin, S. Kazan, B. Aktas, M. Obaida, H. Inam and K. Westerholt

International Conference on Superconductivity and Magnetism (ICSM-2010), April 25-30, 2010, Antalya, Türkiye

13. Magnetic properties and Gilbert damping constant study of Co2MnAl1-xSnx Heusler  Alloy thin films

 A.N. Kocbay, R. Topkaya, R. Yilgin, A.S. Ahsen, O. Ozturk, B. Aktas

 International Conference on Superconductivity and Magnetism (ICSM-2010), April 25-30,  2010, Antalya, Türkiye

 

14. Magnetic properties of Mn0.4Ni0.6Fe2O4 nanoparticles synthesized by PEG assisted hydrothermal method

M. Bay, Y. Koseoglu, M. Tan, A. Baykal, R. Topkaya and N. Akdogan

International Conference on Superconductivity and Magnetism (ICSM-2010), April 25-30, 2010, Antalya, Türkiye

 

15. Magnetic properties of Mn0.4Ni0.6Fe2O4 nanoparticles synthesized by PEG assisted hydrothermal method

M. Bay, Y. Koseoglu, M. Tan, A. Baykal, R. Topkaya and N. Akdogan

International Conference on Superconductivity and Magnetism (ICSM-2010), April 25-30, 2010, Antalya, Türkiye

 

16. Interlayer Exchange Coupling in Multilayers

 B. Aktaş, R. Topkaya, M. Erkovan, A. Öztürk, O. Öztürk, M. Özdemir

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze, Türkiye

 

17. Magnetic and Dielectric Properties of MnxNi1-xFe2O4 Nanoparticles Synthesized by PEG Assisted Hydrothermal Method

Y. Köseoğlu, M. Bay, M. Tan, A. Baykal, R. Topkaya, N. Akdoğan

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze, Türkiye

 

18. Magnetic and Dielectric Properties of Mn0.6Co0.4Fe2O4 Nanoparticles Synthesized by Polyol Method

Yüksel Köseoğlu, Furkan Alan, Abdülhadi Baykal, Ramazan Topkaya

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze, Türkiye

19. Magnetic and Dielectric Properties of Mn0.6Ni0.4Fe2O4 Nanoparticles Synthesized by PEG Assisted Hydrothermal Method

Muhammet Tan, Yüksel Köseoğlu, Mehmet Bay, Abdülhadi Baykal, Ramazan Topkaya

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze, Türkiye

 

20. Magnetic Properties of Exchange-Biased Co/CoO Bilayers

Erdem Demirci, Ramazan Topkaya, Mustafa Özdemir, Mohamed Obaida, Kurt Westerholt, Sinan Kazan, and Numan Akdoğan

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze, Türkiye

 

21. Temperature Dependent FMR Studies of Exchange Biased Fe/CoO Bilayers

M. Öztürk, R. Topkaya, M. Özdemir, M. Obaida, K. Westerholt, S. Kazan, and N. Akdoğan

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze, Türkiye

 

22. Magnetic Properties of Monolayer CoSb Thin Films

E. Billor, R. Topkaya, N. Akdoğan, M. Özdemir, S. Budak and S. Güner

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze Türkiye

 

23. Structural and Magnetic Properties of Cu2MnAl Heusler Films

Ramazan Topkaya, Numan Akdoğan, Resul Yilgin, Sinan Kazan, Mustafa Özdemir, Jörg Dudek, Mohamed Obaida, Hasan Inam, and Kurt Westerholt

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze Türkiye

 

24. Comparison of the Structural and Magnetic Properties of Submicron Barium Hexaferrite Powders Prepared by Molten Salt and Conventional Synthesis Routes

Sinan Dursun, Ramazan Topkaya, Numan Akdoğan and Sedat Alkoy

International Conference on Nanoscale Magnetism (ICNM), September 28 – October 2, 2010, Gebze Türkiye

 

25. Magnetic Properties of Exchange Coupled Py/Cr/Py trilayer film

B. Aktaş, R. Topkaya, M.Erkovan, M.Özdemir, O.Öztürk

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

26. What determines the easy-axis in magnetic nanowire arrays?

Orhan Yalçın, Giray Kartopu, K. L. Choy, Ramazan Topkaya

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

27. Effect of Exchange Bias on Magnetic Anisotropies in Fe/CoO Bilayers

Mustafa Öztürk, Ramazan Topkaya, Mustafa Özdemir, Mohamed Obaida, Kurt Westerholt, Sinan Kazan, and Numan Akdogan

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

 

 

28. Investigation of Thickness Dependent Magnetic Anisotropies in FeCo Alloys

Sinem Gök, Ramazan Topkaya, Sinan Kazan, Numan Akdogan, Mustafa Özdemir, Mohamed Obaida, and Kurt Westerholt

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

29. The Effect of Annealing Temperature on Magnetic Properties of Cu2MnAI Heusler Films

Ramazan Topkaya, Numan Akdoğan, Resul Yilgin, Sinan Kazan, Mustafa Özdemir, Jörg Dudek, Mohamed Obaida, Hasan Inam, and Kurt Westerholt

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

30. Magnetic Properties of Co2MnAl1-xSnx Heusler Alloy Thin Films

A. N. Koçbay, R. Topkaya, R. Yilgin, V. Keskin, A. Ahsen, O. Öztürk, B. Aktaş

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

31. Exchange-Bias Effect in Co/CoO Bilayers Studied by Ferromagnetic Resonance

Erdem Dernirci, Ramazan Topkaya, Mustafa Özdemir, Mohamed Obaida, Kurt Westerholt, Sinan Kazan, and Numan Akdoğan

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 

32. Thickness Dependence of Magnetic Properties of Polycrystalline Co2MnAlxSn1-x Heusler Alloy Thin Films

Vedat Keskin, Ramazan Topkaya, Abdullah N. Koçbay, Resul Yilgin, Ali Şems Ahsen, Osman Öztürk, and Bekir Aktaş

6th Nanoscience and Nanotechnology Conference, NanoTr VI, June 15-18, 2010, İzmir, Türkiye

 33. Magnetization Dynamics of As-Quenched and Pulse Annealed Soft Metallic Glasses

Recep ŞAHİNGÖZ, M. EROL, S. YILMAZ, S. KAZAN, R. TOPKAYA

Turkish Physical Society, 27. International Physics Congress, 14-17 September 2010, İstanbul, Türkiye

 

34. Investigation of Magnetic Profile of Fe77Cr2Si5B16 Metallic Glass By Using Ferromagnetic Resonance (FMR) and Vibrating Sample Magnetometry (VSM) Techniques

Mustafa EROL, R. ŞAHİNGÖZ, S. YILMAZ, S. KAZAN, R. TOPKAYA

Turkish Physical Society, 27. International Physics Congress, 14-17 September 2010, İstanbul, Türkiye

 

35. Magnetic Properties of Exchange-Coupled Py/Cr/Py Films

B. Aktaş, R. Topkaya, M. Erkovan, M. Özdemir

SPIN PHYSICS, SPIN CHEMISTRY AND SPIN TECHNOLOGY, November 1–5, 2011, Kazan

 

36. Interlayer Exchange Coupling in Py/Cr/Py Multilayers

B. Aktaş, R. Topkaya, M. Erkovan, O. Öztürk, M. Özdemir

NanoTR VII - Nanoscience and Nanotechnology Conference, June 27 - July 1, 2011,

Sabancı Üniversitesi, İstanbul - Türkiye

 

37. Magnetic Properties of Mn0.4Ni0.6Fe2O4 Nanoparticles Synthesized by PEG Assisted Hydrothermal Method

Mehmet Bay, Yüksel Köseoğlu, Muhammet Tan, Abdülhadi Baykal, Ramazan Topkaya, Numan Akdoğan

NanoTR VII - Nanoscience and Nanotechnology Conference, June 27 - July 1, 2011,

Sabancı Üniversitesi, İstanbul - Türkiye

 

38. Effect of Crystallinity and Particle Morphology on the Magnetic Anisotropy of Submicron Barium Hexaferrite Powders

Sedat Alkoy, Sinan Dursun, Ramazan Topkaya and Numan Akdoğan

NanoTR VII - Nanoscience and Nanotechnology Conference, June 27 - July 1, 2011,

Sabancı Üniversitesi, İstanbul – Türkiye

 

39. Thickness Dependent Magnetic Properties of Fe/CoO Bilayers

Mustafa Öztürk, Erdem Demirci, Ramazan Topkaya, Mohamed Obaida, Kurt Westerholt, Sinan Kazan, and Numan Akdoğan

NanoTR VII - Nanoscience and Nanotechnology Conference, June 27 - July 1, 2011,

Sabancı Üniversitesi, İstanbul – Türkiye

 

40. Thickness and temperature dependence of exchange bias in Co/CoO bilayers

Erdem Demirci, Mustafa Öztürk, Ramazan Topkaya, Mohamed Obaida, Kurt Westerholt, Sinan Kazan, and Numan Akdoğan

NanoTR VII - Nanoscience and Nanotechnology Conference, June 27 - July 1, 2011,

Sabancı Üniversitesi, İstanbul – Türkiye

 

41. FMR STUDY OF Co/Ti BILAYER THIN FILMS

R. TOPKAYA, O. ÖZTÜRK, M. ERKOVAN

Türk Fizik Derneği 28. Uluslararası Fizik Kongresi, Bodrum, Türkiye, 6-9 Eylül 2011

 

42. Ferromagnetic Resonance studies of Exchange Coupled Py/Cr/Py thin multilayer films for magnetic field sensing applications

M.Özdemir, B. Aktaş, R.Topkaya, M. Erkovan, A. Öztürk

Workshop on Magnetic resonance detection of explosives and illicit materials (MRDE), 18-23 September 2011, Yalova, Turkey

 

 

43. Magnetic Behaviour of Exchange Coupled Py/Cr/Py films

 B. Aktaş, R.Topkaya, M. Erkovan, M.Özdemir

 International Conference on Materials Science and its Applications: Development and        Innovation (ICMSA), 13-15 February, 2012, Taif University, Kingdom of Saudi Arabia

 

44. Thickness and Temperature Dependent Magnetic Properties of Co/CoO Bilayers

Mustafa Öztürk, Erdem Demirci, Ramazan Topkaya, Sinan Kazan, and Numan Akdoğan

International Conference on Materials Science and its Applications: Development and Innovation (ICMSA), 13-15 February, 2012, Taif University, Kingdom of Saudi Arabia

 

45. Magnetization dynamics of epitaxially grown Fe/CoO magnetic Bilayer on MgO (100) substrate

Sinan Kazan, Nurettin Koçbay, Ramazan Topkaya, Erdem Demirci, Numan Akdoğan, Mustafa Öztürk, Resul Yilgin and Mustafa Özdemir

International Conference on Materials Science and its Applications: Development and Innovation (ICMSA), 13-15 February, 2012, Taif University, Kingdom of Saudi Arabia

 

46. Magnetic Properties of Exchange-biased NiFe/CoO Bilayers

R. Topkaya, S. Kazan

8th Nanoscience and Nanotechnology Congress, 25-29 June, 2012, Hacettepe Üniversitesi, Ankara-Türkiye

 

47. Spin Dynamics of Interlayer Exchange Coupled Magnetic Multilayers

B. Aktaş, M.Özdemir, R.Topkaya, M. Erkovan

NanoTR-9, June 24-28, 2013, Ataturk Üniversitesi, Erzurum, Türkiye

48. Yafet–Kittel-type magnetic order in Zn-substituted cobalt ferrite nanoparticles

R. Topkaya, A. Baykal and A. Demir

International Conference on Nanoscale Magnetism (ICNM), September 2-6, 2013, İstanbul, Türkiye

 

49. FMR Study of Co/Ti Bilayer Thin Films

Mustafa Erkovan, Sibel Tokdemir Öztürk, Dilek Taşkın Gazioğlu, Ramazan Topkaya, Osman Öztürk

3rd International Advances in Applied Physics and Materials Science Congress, APMAS 2013, Antalya-Türkiye, 24-28 Nisan 2013

 

50. MgO Alttaş Üzerinde Büyütülen CoO/NiFe ve CoO/Fe Filmlerinde Exchange Bias Etkisi

Ramazan Topkaya, Sinan Kazan, Bekir Aktaş

20. Yoğun Madde Fiziği Ankara Toplantısı, Hacettepe Üniversitesi, 26 Aralık 2014

 

51. ESR, electrical and chemical properties of powdered basalt rocks

Süreyya A. Yüksel, Çiğdem Nuhoğlu, Mucip Tapan, Yaşar Nuhoğlu, A. Nihat Bilgen, Ramazan Topkaya, Özlem Yağcı, Orhan İçelli

INTERNATIONAL CONFERENCE ON LUMINESCENCE AND ESR DOSIMETRY, LumiDoz 8, 27‐29 Ağustos 2014 – Ankara/TÜRKİYE

 

52. Exchange bias properties of CoO-based thin films

R. Topkaya, S. Kazan, B. Aktas

9th International Conference on Magnetic and Superconducting Materials, MSM15, Antalya-TURKEY 30 April-3 May, 2015

 

53. CoO BAZLI İNCE FİLMLERDE EXCHANGE BIAS ETKİSİ

Ramazan Topkaya, Sinan Kazan

ADIM FİZİK GÜNLERİ IV, 28-29 Mayıs 2015, Kütahya, Türkiye

 

54. Enhancement of exchange bias with crystal orientation in cobalt oxide based magnetic thin films

R. Topkaya and S. Kazan

11th Nanoscience and Nanotechnology Conference (NanoTR-11), Orta Doğu Teknik Üniversitesi, Ankara, Turkey. 22 -25 June, 2015

 

55. Effect of annealing and concentration on magnetic properties of CoTa alloy thin films

 Ramazan Topkaya, Salih Akbulut and Fikret Yıldız

12th International Nanoscience and Nanotechnology Conference, (NanoTR-12), 03-05 June 2016, Darıca - Kocaeli / Turkey

 

56. Effect of annealing and concentration on magnetic properties of CoTa alloy thin films

Salih ÖNGÜL, Recep ŞAHİNGÖZ, Ramazan TOPKAYA

12th International Nanoscience and Nanotechnology Conference, NanoTR-12, Darıca, Kocaeli/ Turkey, 03-05 June 2016

 

57. Magnetic properties of BaYxFe12-xO19 hexaferrites synthesized by facile ceramic method

 Ramazan Topkaya

2nd International Congress on the World of Technology and Advanced Materials

(WITAM 2016), 28 September-02 October 2016 Kırşehir/Turkey

 

58. Growth and magnetic characterization of iron, nickel, and nickel-iron nanowires by electrochemical deposition in hard anodized aluminum oxide templates

 O. Yalçın, G. Kartopu, H. Tarim, R. Topkaya and N. Akdoğan

2nd International Congress on the World of Technology and Advanced Materials

(WITAM 2016), 28 September-02 October 2016 Kırşehir/Turkey

 

59. Ferromagnetic Resonance Study of Fe/Cu Multilayer Thin Film

 Ramazan Topkaya

II. International Iğdır Symposium, October 9-11 2017 Iğdır/Turkey

 

60. Magnetic Properties of Bi-La Substituted Barium Hexaferrites

 Ramazan Topkaya

II. International Iğdır Symposium, October 9-11 2017 Iğdır/Turkey

 

61. Structural, Optical and Magnetic Properties of Transition Metal Doped ZnO

 Ramazan Topkaya, Adem Kocyigit, Genber Kerimli

International Engineering and Technology Symposium, 3-5 May 2018, Batman, Turkey

 

62. Exchange Bias Effect in CoO-Based Thin Films,

 Ramazan Topkaya, Sinan Kazan

International Engineering and Technology Symposium, 3-5 May 2018, Batman, Turkey

 

63. Magnetic Properties of Yttrium-Substituted Barium Hexaferrites,

 Ramazan Topkaya

International Engineering and Technology Symposium, 3-5 May 2018, Batman, Turkey

 

64. Development of Multiferroic Materials for Spintronics Applications

 Ramazan Topkaya

4th International Energy & Engineering Congress, 24-25 October 2019, Gaziantep, Turkey


Papers Presented in National Scientific Meetings and Published in Proceedings:

1.   FMR Investigations on Exchange Coupled Py/Cr/Py trilayer films

      B. Aktaş, M.Erkovan, R. Topkaya, M. Özdemir, O. Öztürk

      5. National Nanotechnology and Nanoscience Conference, Eskişehir, TÜRKIYE, 2009

 

2.   Single Crystalline Co2MnAl Heusler Alloy Thin Films Investigated by FMR

      A. N. Kocbay, R. Yilgin, R. Topkaya, B. Aktas, M. Oogane, Y. Ando, T. Miyazaki

      5. National Nanotechnology and Nanoscience Conference, Eskişehir, TÜRKIYE, 2009

 

3.   FMR Investigations on Exchange Coupled Co/Ti/Co Trilayer Films

      M.Erkovan, B. Aktaş, R. Topkaya, M. Özdemir, O. Öztürk

      5. National Nanotechnology and Nanoscience Conference Eskişehir, TÜRKIYE 2009

 

4.   MgO Alttaş Üzerinde Büyütülen CoO/NiFe ve CoO/Fe Filmlerinde Exchange Bias Etkisi

Ramazan Topkaya, Sinan Kazan, Bekir Aktaş

20. Yoğun Madde Fiziği Ankara Toplantısı, Hacettepe Üniversitesi, 26 Aralık 2014

 

5.   CoO BAZLI İNCE FİLMLERDE EXCHANGE BIAS ETKİSİ

Ramazan Topkaya, Sinan Kazan

ADIM FİZİK GÜNLERİ IV, 28-29 Mayıs 2015, Kütahya, Türkiye

National & International Books Written:

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Chapters in National & International Books:

1.  Magnetic Characterization of Exchange Coupled Ultrathin Magnetic Multilayers by Ferromagnetic Resonance Technique

Bekir Aktaş, Ramazan Topkaya, Mustafa Erkovan, Mustafa Özdemir

Nanostructured Materials for Magnetoelectronics, Springer Series in Materials Science, Volume 175, pp 85-117 (2013)

Directed Doctoral Dissertations:

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Directed Master Dissertations:

1. Iğdır İlinin Şalt Sahasında Yüksek Gerilim Sistemlerinin Analizi

Fizik-I

Fizik-II

İleri Elektromanyetik Alan Teorisi

Mikrodalga Tekniği

1. Mayın ve patlayıcı madde bulma amaçlı çok hassas çekirdek kuadrupol rezonans (NQR) tekniğinin geliştirilmesi, TUBITAK-MAG (No.106T321), 2008, Araştırmacı (tamamlandı)

2. Nano boyutta Spin-RAM’lerin spin dinamiğinin araştırılması, TUBITAK-TBAG (No. 107T648), 2010, Araştırmacı (tamamlandı)

2005, Spring :  METU – Honour Student

 

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