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Please use this identifier to cite or link to this item: http://purl.org/purl/4368

Title: Microstructure and random magnetic anisotropy in Fe–Ni based nanocrystalline thin films
Authors: Anantharaman, M R
Senoy, Thomas
Al-Harthi, S H
Sakthi Kumar, D
Al-Omari, I A
Ramanujan, R V
Yasuhiko, Yoshida
Issue Date: 17-Jul-2008
Publisher: IOP Publishing LTD
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
Description: J. Phys. D: Appl. Phys. 41 (2008) 155009 (8pp)
URI: http://dyuthi.cusat.ac.in/purl/4368
Appears in Collections:Dr. M R Anantharaman

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