Co-Fe-B合金薄膜の磁気緩和定数測定(スピンエレクトロニクス)

概要

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We investigated magnetic damping parameters (a) in Co-Fe-B alloy thin films having various compositions, thicknesses, and annealing temperatures. Ferromagnetic resonance (FMR) was used to determine α values. The out-of-plane angular dependencies of the resonance field and the line width of FMR spectra were measured and analyzed by using the Landau-Lifshitz-Gilbert equation, taking the effect of magnetic inhomogeneities in the films into consideration. The Co-Fe-B films with an fcc structure phase had a larger α value than that of the film with a bcc structure. The damping parameter of the Co-Fe-B film was increased by increasing the B concentration and annealing temperature, and the very thin Co-Fe-B film (〜2 nm) had a large damping parameter. We discuss the advantages of Co-Fe-B thin film as a material for current-induced magnetization switching (CIMS) systems.
社団法人日本磁気学会の論文
2007-05-01