イオンビームスパッタ法によって作製したFeNiエピタキシャル薄膜の結晶構造および磁気特性

概要

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We prepared epitaxially grown Fe_<100-x>Ni_x films on (110) GaAs single-crystal substrates by means of ion-beam sputtering, and examined their fundamental properties such as crystal structure and magnetic anisotropy in detail. In epitaxially grown Fe_<100-x>Ni_x films, we found that singlecrystalline bcc phase remains unless x exceeds 30 at% judging from streaky RHEED patterns. A decrease in magnetization was observed at x=40 at%, which means that the invar composition shifts by about 10 at% toward Ni-rich composition. Reflecting single-crystal bcc alloys, magnetization curves measured with a VSM and a torque magnetometer could be well reproduced by biaxial magnetocrystalline anisotropy and magnetoelastic anisotropy caused by the lattice misfit between film and GaAs substrate, where the internal stress is considered to be greatly reduced.
2001-03-01