Perpendicular exchange bias of (Pt/Co)_n/FeMn multilayers

Zhonghai Zhai1,2), Yang liu1), Jiao Teng1), Baohe Li1,3), Guanghua Yu1), and Fengwu Zhu1) 1) Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2) College of Science, Shenyang Jianzhu University, Shenyang 110168, China 3) Department of Mathematics and Physics, Beijing Technology and Business University, Beijing 100037, China

摘 要：(Pt/Co)n/FeMn multilayers with perpendicular anisotropy （PA） were prepared by magnetron sputtering with Pt as the buffer layer and the capping layer. The dependence of perpendicular exchange bias （PEB）, Hex, on the thickness of the FeMn antiferromagnet （AFM） layer is similar to that of in-plane exchange bias. The value of Hex for the （Pt/Co）3/FeMn multilayer reaches 22.3 kA/m. A thin Pt spacer was inserted between the Co/FeMn interface to enhance PEB. The PEB reaches the largest at 39.8 kA/m when the thickness of the Pt spacer is 0.4 nm.

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