Amorphous Tb40Fe60-Fe80B20-Tb40Fe60 sandwich films were prepared by multitarget rf magnetron co-sputtering. Their magnetization and magnetostriction were studied to examine whether magnetic softening of the amorphous TbFe films could be achieved without loosing their giant magnetostriction by introducing the simple sandwich structure. The results revealed that a considerably soft in-plane magnetization (coercive force H≈ 6Oe and the squareness ratio Mr/Ms≈ 0.8) and a huge magnetostriction (λ >500ppm) could be obtained in the sandwich films at room temperature, provided that the thickness of the FeB interlayer was within the range of 10% to 40% of the total film thickness (1 μm).
High field ferromagnetic resonance measurements of the anisotropy field of longitudinal recording thin-film media Magnetic and structural properties of hexagonal-close-packed-CoCrPt-C granular media for high areal density recordingThe magnetic anisotropy derived from interparticle interactions in a CoPtCr/SiO 2 granular thin film longitudinal medium has been experimentally studied. In order to clarify the effect of magnetostatic interactions between particles in the medium, the angular dependence of the interaction fields has been investigated. The interaction fields in the medium were obtained from the remanent magnetization curves measured in several directions in the plane normal to the medium plane by compensating for the demagnetizing fields at each measurement direction. It has been shown that the interparticle interactions in the medium exhibit clear anisotropy, which is related to the magnetostatic interactions. As a result, the intrinsic magnetic anisotropy of the medium has been quantitatively separated into two contributions, the magnetic interaction anisotropy between particles and the anisotropy of each particle. The magnetic anisotropy caused by the interparticle interactions in the medium plays an important role in the thermal stability of the magnetization in the recorded media, in the minor-loop magnetizing process and in the recording process of the medium when using a ring-type head.
A computer-controlled laser probe surface-acoustic-wave (SAW) observation system was constructed, which facilitates reconstruction of 3-dimensional images of travelling Rayleigh SAWs. Vivid images of a propagating single SAW and two colliding SAWs on a glass plate were observed by this system. The system is thus used as a powerful tool for elucidating the dynamic behaviors of SAW, especially for identification of surface acoustic solitons.
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