Abstract
Fe(100)bcc single-crystal film, Fe-B amorphous film, and Fe-B film consisting of a mixture of epitaxial bcc(100) crystal and amorphous are prepared on MgO(100) single-crystal substrates. The influence of crystallographic property on the magnetostriction behavior under rotating magnetic fields is investigated. The output waveform of magnetostriction is sinusoidal for the amorphous film, whereas that of single-crystal film shows a triangle shape. 90° magnetic domain walls are observed for the single-crystal Fe film and the film shows a four-fold symmetry in in-plane magnetic anisotropy. The observation of triangle waveforms is related to the domain wall motion in magnetically unsaturated Fe(100)bcc film under rotating magnetic fields. A distortion from triangle wave is observed for the Fe-B film consisting of a mixture of bcc-crystal and amorphous. The magnetostriction behavior is influenced by the magnetization structure.
Highlights
Soft magnetic materials have been widely used in applications like transformers, motors, and magnetic devices, where the materials are often exposed to alternating magnetic fields
In order to investigate the magnetostriction of materials with magnetic anisotropies, it is useful to employ an epitaxial single-crystal thin film, because the film uniformity and the magnetic anisotropy are controlled by the orientation of single-crystal substrate
Thin films were prepared on polished MgO(100) substrates by using a radio-frequency (RF) magnetron sputtering system equipped with a reflection high-energy electron diffraction (RHEED) facility
Summary
Soft magnetic materials have been widely used in applications like transformers, motors, and magnetic devices, where the materials are often exposed to alternating magnetic fields. In order to apply soft magnetic materials for such practical applications, it is important to understand the magnetostriction behavior under rotating magnetic fields. Fe and FeB-alloy are typical soft materials. In order to investigate the magnetostriction of materials with magnetic anisotropies, it is useful to employ an epitaxial single-crystal thin film, because the film uniformity and the magnetic anisotropy are controlled by the orientation of single-crystal substrate. In our previous study [4], the effects of Fe/B composition and formation temperature on the crystallographic properties of FeB-alloy films were investigated. Fe(100) singlecrystal film, FeB amorphous film, and FeB film consisting of a mixture of bcc(100) crystal and amorphous are prepared on single-crystal substrates by adjusting the Fe/B composition and the substrate temperature. The relationship between crystallographic property and magnetostriction behavior under rotating fields is investigated
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