Studies of the magnetoelastic inverse Wiedemann effect in pulsed laser deposited cylindrical cobalt films
Authors: C. Favieres; V. Madurga
Source: Journal of Physics: Condensed Matter, Volume 16, Number 26, 7 July 2004 , pp. 4725-4741(17)
Publisher: Institute of Physics Publishing
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Abstract:
Cylindrical soft magnetic Co films, nanostructured with a grain size of 1–2 nm and between &{approx }1.3 ; and 90 nm in thickness, were produced by the pulsed laser deposition technique. These films showed a magnetostrictive property. The magnetoelastic inverse Wiedemann effect, or IWE, of longitudinal magnetization as a function of the circular applied magnetic field, Mz–H
, was measured. The IWE made it possible to explain the magnetization processes according to an initial reversible rotation of the magnetization followed by magnetic wall nucleation and propagation. A magnetization rotation model allowed us to compare the reversible part and the first irreversible magnetization processes corresponding to the IWE. In this way, the values of the helical magnetic anisotropy, Kh, due to the helical stresses, 
h, generated by an applied torque to the films, were determined. A linear increase of the nucleating magnetic wall field, HN, with the applied torque, or with h, was observed. In addition, the IWE made it possible to establish the non-dependence of the saturation magnetostriction constant, 
s, on the sample thickness and to determine the value of this negative isotropic &lambda _{mathrm {s}} approx-4.8times 10ˆ{-6} ;.
Document Type: Research article
DOI: 10.1088/0953-8984/16/26/007
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