MAGNETIC ANISOTROPY DISTRIBUTED NEAR THE SURFACE OF AMORPHOUS RIBBONS

概要

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Magnetic anisotropy in an amorphous ribbon of Fe_<40>Ni_<40>P_<14>B_6, Allied Chemical Metglas 2826, has been studied. Magnetic domain structures and the in-plane anisotropy were measured as a function of the depth from the ribbon surface by a powder technique, transmission electron microscopy and a torque method. The data have an obvious connection with the surface topography of the ribbon that is introduced in the melt and quench process. Groups of fine domains, which originate from the perpendicular anisotropy, cover a large part of the as-quenched surface. They diminish rapidly with depth. In accordance with the disappearance of fine domains the in-plane anisotropy also decreases. It shows a maximum, an order of 10^5 erg/cc, at the surface and decreases one or two orders smaller at the center of the ribbon. These results suggest an inhomogeneous distribution of internal stress that is introduced at the quenching process.
東北大学の論文