Microstructure and random magnetic anisotropy in Fe-Ni based nanocrystalline thin films

Senoy Thomas, S. H. Al-Harthi, D. Sakthikumar, I. A. Al-Omari, R. V. Ramanujan, Yasuhiko Yoshida, M. R. Anantharaman

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Nanocrystalline Fe-Ni thin films were prepared by partial crystallization of vapour deposited amorphous precursors. The microstructure was controlled by annealing the films at different temperatures. X-ray diffraction, transmission electron microscopy and energy dispersive x-ray spectroscopy investigations showed that the nanocrystalline phase was that of Fe-Ni. Grain growth was observed with an increase in the annealing temperature. X-ray photoelectron spectroscopy observations showed the presence of a native oxide layer on the surface of the films. Scanning tunnelling microscopy investigations support the biphasic nature of the nanocrystalline microstructure that consists of a crystalline phase along with an amorphous phase. Magnetic studies using a vibrating sample magnetometer show that coercivity has a strong dependence on grain size. This is attributed to the random magnetic anisotropy characteristic of the system. The observed coercivity dependence on the grain size is explained using a modified random anisotropy model.

Original languageEnglish
Article number155009
JournalJournal of Physics D: Applied Physics
Volume41
Issue number15
DOIs
Publication statusPublished - Aug 7 2008

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Magnetic anisotropy
Coercive force
coercivity
grain size
Annealing
Thin films
microstructure
Microstructure
anisotropy
annealing
Scanning tunneling microscopy
Magnetometers
thin films
Crystallization
Grain growth
magnetometers
Oxides
x ray spectroscopy
scanning tunneling microscopy
Anisotropy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Microstructure and random magnetic anisotropy in Fe-Ni based nanocrystalline thin films. / Thomas, Senoy; Al-Harthi, S. H.; Sakthikumar, D.; Al-Omari, I. A.; Ramanujan, R. V.; Yoshida, Yasuhiko; Anantharaman, M. R.

In: Journal of Physics D: Applied Physics, Vol. 41, No. 15, 155009, 07.08.2008.

Research output: Contribution to journalArticle

Thomas, Senoy ; Al-Harthi, S. H. ; Sakthikumar, D. ; Al-Omari, I. A. ; Ramanujan, R. V. ; Yoshida, Yasuhiko ; Anantharaman, M. R. / Microstructure and random magnetic anisotropy in Fe-Ni based nanocrystalline thin films. In: Journal of Physics D: Applied Physics. 2008 ; Vol. 41, No. 15.
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