MgO単結晶基板上におけるFe薄膜のエピタキシャル成長(薄膜・微粒子・多層膜・人工格子)

概要

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Fe thin films were prepared on MgO(100), MgO(110), and MgO(111) substrates by UHV-MBE. The film growth structure and the magnetic properties were investigated. Insitu RHEED observation showed that epitaxial Fe thin film with the (100)_<bcc>, (211)_<bcc>, and (110)_<bcc> planes parallel to the substrate surface grew on respective MgO substrates at elevated temperatures. The Fe(100)_<bcc> film formed on MgO(100) is a single crystal, while the Fe(211)_<bcc> films on MgO(110) consists of two domains with a twin relationship. The Fe(110)_<bcc> film on MgO(111) consists of two types of sub-domains with Nishiyama-Wasserman and Kurdjumov-Sachs epitaxial orientation relationships. A 0.3%-0.5% reduction of the lattice spacing perpendicular to the substrate surface was observed by X-ray diffraction for Fe thin films prepared at a substrate temperature of 200 ℃. This reduction decreases with increasing the substrate temperature for the MgO(100) and (111) substrates. The in-plane magnetic anisotropy measured for three epitaxial films reflects the magneto-crystalline anisotropy of bulk Fe crystal.
社団法人日本磁気学会の論文
2008-05-01