光磁気記録材料における交換結合(<特集>「磁性薄膜作製技術II」)

概要

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Exchange-coupling in magneto-optical recording is reviewed. Exchange-coupling has been widely used for improving the S/N ratio of the readout signal, overwriting by light intensity modulation or readout of tiny marks, and other purposes. Although the strength of the exchange-coupling is characterized using the interface wall energy σ_w or the exchange-coupling energy J, σ_w and J should be distinguished. A relatively large value of σ_w can be easily obtained, using a conventional sputtering apparatus. Exchange-coupling in rare earth-3d transition metal films and methods of controlling it are summarized. The value of σ_w can be reduced by inserting an intermediate layer. Control of the temperature dependence of σ_w is somewhat difficult. In the case of switching of the exchange-coupling, the thickness as well as Curie temperature of the switching layer is an important parameter.
社団法人日本磁気学会の論文
2005-12-01