FePt(001) エピタキシャル垂直磁化膜の作製と磁気特性

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  • Preparation of FePt(001) Epitaxial Perpendicularly Magnetized Thin Films and Their Magnetic Properties
  • FePt 001 エピタキシャル スイチョク ジカ マク ノ サクセイ ト ジ

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Epitaxial FePt(001) thin films were prepared on MgO(100) substrates by RF-magnetron sputtering. Magnetization measurements revealed that all the samples were more easily magnetized by a field applied perpendicular to the film plane than by one applied parallel to it. The square-ness Mr/Ms improved with decreasing FePt layer thickness dFePt; this is considered to be due to a change in the magnetic domain structure. Pt buffer layers were also found to be effective for improving the magnetic properties. The maximum energy product (B·H)max a sample with dPt=1000Å grown on a polished substrate had a maximum value of 30 MG-Oe This effect of the Pt buffer layer on the magnetic properties is sensitive to the surface condition of the substrate.

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