Title:
|
Microstructure and random magnetic anisotropy in Fe–Ni based nanocrystalline thin films |
Author:
|
Anantharaman, M R; Senoy, Thomas; Al-Harthi, S H; Sakthi Kumar, D; Al-Omari, I A; Ramanujan, R V; Yasuhiko, Yoshida
|
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
|
Date:
|
2008-07-17 |