Abstract
The interlayer coupling in Co/Pt multilayers has been investigated via the measurements of extraordinary Hall effect. In the conventional [Co/Pt]n multilayer, the coercivity HC has been observed to increase exponentially for n<6 and almost linearly for n>6 with the decrease of temperature. Surprisingly, HC for n=1 shows the fastest increase at low temperatures, and becomes the largest one at T<40K. As a function of the repetition number n, the almost temperature-independent oscillation of HC has been observed, being indicative of the Ruderman–Kittel–Kasuya–Yosida type ferromagnetic interlayer coupling in the [Co/Pt]n multilayer. However, the antiferromagnetic interlayer coupling can be realized via the spin-valve configuration of the Co/Pt multilayer. In the Co/Pt/[Co/Pt]n multilayer, the antiferromagnetic-to-ferromagnetic transition of the interlayer coupling has been observed at low temperatures. These observed phenomena are strongly related to the temperature-dependent polarization in the Co/Pt multilayers.
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