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Abstract
Investigation has been performed on exchange bias in a Co(32Å)∕NiO(10Å)∕[Co(4Å)∕Pt(6Å)]4 multilayer after cooling at remanence. The easy axes of the Co∕Pt multilayer and the 32Å Co layer are different. Both exchange bias and vertical loop shifts have been observed in the out-of-plane loop, and they disappear at the same temperature of 170K. No obvious vertical shift is observed in the in-plane loops, but the exchange bias transitions from negative at T<50K to positive at T>50K. These phenomena have been ascribed to the interfacial induced net moment in the NiO spacer.
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