α-Fe/Nd-Fe-B交換結合スパッタ多層膜の磁気特性 (<特集>ハード材料)

概要

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Multilayers of Ti/Fe/[Nd-Fe-B/Fe]×5/Ti/glass whose Fe layers had thicknesses ranging from 0 to 50 nm and whose Nd-Fe-B layers had thicknesses ranging from 0 to 100 nm were fabricated by RF sputtering. Magnetization measurements showed that the minor loops of almost all the multilayers exhibited spring-back behavior, which suggests exchange-coupling between the Fe and Nd-Fe-B layers. To estimate the coupling strength between the Fe and Nd-Fe-B layers, we performed a micromagnetic calculation of the magnetization curves. From a comparison of the experimental and calculated results, we can infer that the coupling strength between Fe and Nd-Fe-B layers is about 2.0×10^<-3> J/m^2, which is about 10% of that in Fe/Fe and Nd-Fe-B/Nd-Fe-B couplings.
社団法人日本磁気学会の論文
1997-04-15