Experimental Study on Interlayer Magnetic Coupling in Sputtered Al/Fe/Al/Gd Magnetic Multilayer Films. I
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概要
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Interlayer magnetic coupling (IMC) between Fe and Gd layers through Al spacer has been experimentally studied on [Al(<I>R</I> Å)/Gd(40 Å)/Al(<I>R</I> Å)/Fe(20 Å)]×<I>N</I>/Al(5 Å) magnetic multilayers, where <I>R</I>=0, 5, 10, and 20 as nominal figures. Magnetization curves and the temperature dependence of magnetization are reported. Magnetic Compton-profile technique has been used to determine the amounts and the signs of spin magnetizations of Fe and Gd layers for <I>R</I>=5 and 20. A line-shape analysis of the magnetic Compton profile on the multilayer of <I>R</I>=5 has verified that the IMC is antiferromagnetic, and the negative small amount of magnetization of Gd layer exists even at room temperature under 1 kOe, despite the absence of ferromagnetic magnetization of a Al(5 Å)/Gd(40 Å) multilayer at room temperature. The antiferromagnetic IMC has been confirmed in the case of <I>R</I>=0, 5 and 10, but the IMC is not observed in the case of <I>R</I>=20.
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