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Magneto-optical and magnetic properties of single and exchange-coupled double-layered TbNdFeCo films were examined. Very thin TbNdFeCo films with small Tb content were found to be suitable as the 1st layer of double-layered TbNdFeCo films. Large coercivity and large Kerr rotation were concurrently realized in exchange-coupled double-layered TbNdFeCo films. It was also shown that the exchange-coupled double layered TbNdFeCo film has a good recording characteristics at the wavelength of 830nm and the potentiality as a recording medium for shorter wavelength is suggested.
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Fujii et al. (1991) studied this question.
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