期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 385, 期 -, 页码 230-235出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2015.03.028
关键词
Magnetron sputtering; Inter layer coupling; Exchange bias
资金
- National Basic Research Program of China [2010CB934603]
- National Natural Science Foundation of China [51331006, 51271177]
- Ministry of Science, ICT and Future Planning/Korea Research Council for Industrial Science and Technology
Exchange coupling in NiO/Co bilayers and [Pd/Co(t(Co))](n)/NiO/Co trilayers prepared by magnetron sputtering has been investigated. With decreasing thickness (t(Co)) of the Co layers in [Pd/Co] multilayers (MLs) and increasing number of [Pd/Co] repeats (n), the ferromagnetic easy axis of the [Pd/Co] MLs switches from in-plane to out-of-plane direction. Ferromagnetic and non-collinear interlayer couplings between the [Pd/Co] MLs and the Co layer across the antiferromagnetic NiO spacer are found in trilayers. After cooling at in-plane and out-of-plane remanent state, respectively, for t(Co)=1 nm and n=2, a larger inplane exchange bias held of 724 Oe is observed which vanishes at temperatures above 90 K which is the same as the in-plane blocking temperature observed in the NiO/Co bilayer. For t(Co)=0.3 nm and n=7, the in-plane blocking temperature in the trilayer enhances up to 210 K, which strongly depends on orientation and strength of the ferromagnetic [Pd/Co] ML anisotropy axis. (C) 2015 Elsevier B.V. All rights reserved.
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