Study of interface wall energy in exchange-coupled double-layer film
- Mitsubishi Electric Corporation, 8-1-1, Tsukaguchi-Honmach, Amagasaki, Hyogo 661, Japan (JP)
Recently, exchange-coupled multilayer films have been investigated intensively for the magneto-optical recording medium. We studied the interface wall energy density ({sigma}{sub {ital w}}) in the exchange-coupled double-layer TbFeCo films which were prepared by the dc-sputtering method. The composition of the first layer was Tb{sub {ital x}}(Fe{sub 85}Co{sub 15}){sub 100{minus}{ital x}} ({ital x}=14.0--35.0), and that of the second layer was fixed at the compensation composition of Tb{sub 23.8}(Fe{sub 85}Co{sub 15}){sub 76.2}. The magnitude of {sigma}{sub {ital w}} stored in the boundary was determined by the shift field of the minor hysteresis loop of the first layer measured with VSM. It was found that {sigma}{sub {ital w}} depended on the Tb content of the first layer. As a result, {sigma}{sub {ital w}} was correlated with the perpendicular anisotropy ({ital K}{sub {ital u}}), and well explained by the formula, {sigma}{sub {ital w}}{proportional to}({ital K}{sub {ital u}}){sup 1/2}. We can treat the interface wall energy practically as Bloch wall energy; however, {sigma}{sub {ital w}} was determined by the magnetic properties of both layers.
- OSTI ID:
- 6906454
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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