Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1804687 | Journal of Magnetism and Magnetic Materials | 2007 | 7 Pages |
Abstract
In the Co(32Â Ã
)/NiO(tNiOÂ Ã
)/[Co(4Â Ã
)/Pt(6Â Ã
)]4/Pt(50Â Ã
) multilayers, the Co/Pt multilayer keeps its out-of-plane magnetic easy axis, while for the Co(32Â Ã
) layer, its easy axis does no longer lie in-plane completely as observed in the Co(32Â Ã
)/NiO(tNiO Ã
) bilayer, tilting a little out-of-plane due to the noncollinear interlayer coupling between the Co(32Â Ã
) layer and the Co/Pt multilayer. After cooling down to 10Â K from 300Â K at the remanent state for tNiO=20Ã
, it has been observed that the in-plane exchange bias related to the 32Â Ã
Co layer is changed from negative at low temperature to positive at high temperature, and the in-plane blocking temperature is enhanced to be 120Â K much higher than 80Â K observed in the Co(32Â Ã
)/NiO(20Â Ã
) bilayer. The transition of the in-plane exchange bias from negative to positive has been observed for the NiO spacer of at least 80Â Ã
. This transition and the enhanced in-plane blocking temperature can be attributed to the noncollinear interlayer coupling between the 32Â Ã
Co layer and the Co/Pt multilayer across the spin structure in the NiO spacer.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Z.Y. Liu, J.L. He, D.L. Yu, Y.J. Tian, G.H. Yu, Y. Jiang,