Abstract
Spin flopping phenomena in multilayers consisting of two magnetic materials were investigated. In contrast to usual ferrimagnets where spin flopping occurs at a very high field, multilayers can be designed so as to exhibit the spin flopping in a rather low field. Samples were prepared by alternate deposition of Gd-rich amorphous GdFe alloy and pure Fe, and spin flopping processes were studied at room temperature. Since the magnetization of a pure Fe layer is larger than that of a GdFe layer, at low magnetic fields, the magnetization of the Fe layer is aligned to the direction of the external field whereas that of the GdFe layer is antiparallel. A certain critical field, the magnetization of the GdFe layer begins to turn to the direction of the external field. The field dependence of magnetization is accounted for by assuming a twisted spin structure in GdFe layer.
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