Abstract. Crystallographic orientation dependence of Gilbert damping constant, !, has been measured under different static magnetic fields for Fe 70 Co 30 (100) single-crystal thin film samples prepared at various substrate temperatures. Lorentz type resonance peaks are observed for the samples prepared below 200 ºC. For a sample deposited at 400 ºC, broadening of the resonance peak is observed, which is related with an increased surface roughness. ! value decreases monotonically with increasing the static field when the field is applied parallel to the easy magnetization axis, whereas it increases when the field is applied along the hard magnetization axis up to around the anisotropy field and then decreases. The minimum value of ! is determined to be 0.012 for the hard axis under static fields greater than 650 Oe. The value is twice larger compared with that of Fe (100)
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.
Fe-B alloy films of 40 nm thickness are prepared on MgO(001) single-crystal substrates using alloy targets of Fe 100-x B x (x = 0, 8, 13, 18, 25 at. %) by varying the substrate temperature from room temperature to 600 °C. The structure is systematically investigated by reflection high-energy electron diffraction, X-ray diffraction, and cross-sectional high-resolution transmission electron microscopy. (001) single-crystal films with bcc-based disordered A2 structure epitaxially grow at the investigated substrate temperatures for the B contents less than 8 at. %. On the contrary, the Fe87B13, the Fe82B18, and the Fe75B25 films respectively deposited at temperatures lower than 200, 400, and 600 °C involve amorphous. The crystallization temperature increases with increasing the B content. The surface roughness increases with increasing the substrate temperature. Island-like surfaces are formed for the films deposited at elevated temperatures. The (001) films show four-fold symmetries in in-plane magnetic anisotropy, whereas the amorphous films show isotropic magnetic properties. The coercivity increases with increasing the substrate temperature due to that domain wall motion is suppressed by the crevasses in the films existing between large islands.
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