Magneto-optical study of anomalous magnetization reversal in the presence of anisotropy dispersion in CoPd thin films

Mehran Sedrpooshan, Hossein Ahmadvand, Sebastiaan Van Dijken, Diego López González

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
149 Downloads (Pure)

Abstract

Magnetization reversal is investigated in the presence of anisotropy dispersion in weakly disordered CoxPd100-x(x=23,36,43) thin films. A fourfold in-plane magnetic anisotropy is observed for x=23, whereas an increase of the Co:Pd ratio induces a uniaxial anisotropy in x=36 and 43 films. Anomalous magnetization reversal appears along the hard axes (referred to as collapse of hard axes) in x=23 and 36 films, but disappears for x=43. The results are consistent with the two-grain Stoner-Wohlfarth model. It is argued that the collapse of the hard axes can be controlled by intergranular exchange interaction. Quadratic magneto-optical Kerr effect (QMOKE) is also observed in the films and is found to weaken if the in-plane anisotropy is lowered through the Co:Pd ratio. QMOKE is observed for magnetic field orientations near the hard axes but not exactly along it, in agreement with the two-grain Stoner-Wohlfarth model.

Original languageEnglish
Article number214444
Pages (from-to)1-8
JournalPhysical Review B
Volume98
Issue number21
DOIs
Publication statusPublished - 28 Dec 2018
MoE publication typeA1 Journal article-refereed

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