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)

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タイトル別名
  • Magnetic Properties of Exchange-Coupled α-Fe/Nd-Fe-B Multilayer Films Fabricated by Sputtering
  • α-Fe/Nd-Fe-B 交換結合スパッタ多層膜の磁気特性
  • アルファ Fe Nd Fe B コウカン ケツゴウ スパッタ タソウ マク ノ

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抄録

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/m2, which is about 10% of that in Fe/Fe and Nd−Fe−B/Nd−Fe−B couplings.

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