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Yugo Asai,Mitsuru Ohtake,Tetsuroh Kawai,Masaaki Futamoto 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
(Fe0.7Co0.3)100−xBx alloy thin films are prepared on MgO single-crystal substrates with (100),(110), and (111) orientations at 200C by ultra-high vacuum radio-frequency magnetron sputteringwith various B compositions, x, from 0 to 15 at.%. The effects of composition and substrate orientationon the structure and the magnetic properties are studied. Fe-Co epitaxial films with bccstructures are obtained on all substrates. Fe-Co(100) single-crystal films are formed on MgO(100)substrates. Fe-Co films epitaxially grown on MgO(110) substrates consist of two (211) variantswhose orientations are rotated around the film’s normal by 180 each other. Fe-Co(110) filmsgrow epitaxially on MgO(111) substrates with two types of variants, Nishiyama-Wasserman andKurdjumov-Sachs relationships. As the B composition increases up to around 5 at.%, the filminvolves an amorphous structure in addition to an epitaxial bcc crystal structure. With furtherincreases in the B content, the film is only amorphous. The magnetization properties of the filmsinvolving epitaxial crystals reflect the magnetocrystalline anisotropy of the bulk Fe-Co crystal. The easy magnetization direction varies depending on the crystallographic orientation of the film. Isotropic in-plane magnetic properties are observed for amorphous films.
Taiki Ohtani,Tetsuroh Kawai,Mitsuru Ohtake,Masaaki Futamoto 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Ni80Fe20 (at. %), Co, and Ni epitaxial thin films of fcc(100) and fcc(111) orientations are preparedon single-crystal substrates by using an ultra-high-vacuum radio-frequency magnetron sputteringsystem. The influence of the magnetocrystalline anisotropy on the magnetostriction behavior underin-plane rotating magnetic fields is investigated. Triangular waveforms are observed in themagnetostriction measurements under low rotating fields for films that show four-fold symmetryin the in-plane magnetic anisotropies. The magnetostriction behavior is related to the motion ofninety-degree magnetic domain walls in magnetically unsaturated films. The waveform changesfrom a triangular to a sinusoidal shape when magnetization saturation is approached under increasingmagnetic field. On the other hand, films having almost isotropic in-plane magnetic propertiesshow sinusoidal waveforms even when the films are not magnetically saturated.