Positive exchange bias observed in Pt-inserted Cr2O3/Co exchange coupled bilayers

T. Nozaki, M. Oida, T. Ashida, N. Shimomura, T. Shibata, M. Sahashi

研究成果: Article査読

23 被引用数 (Scopus)

抄録

We investigated the effect of Pt insertion on a Cr2O3/Co exchange coupling system. The perpendicular exchange bias μ0Hex decreased with increasing Pt insertion layer thickness, and we observed positive μ0Hex for samples with relatively thick Pt insertion layers. We also examined the cooling field μ0Hfc dependence of μ0Hex for the samples. At small μ0Hfc, all samples exhibited negative μ0Hex. With increasing μ0Hfc, a shift of μ0Hex from negative to positive was observed. In the past, similar behaviors were observed for FeF2/Fe systems exhibiting positive μ0Hex. In addition, the μ0Hfc dependence of μ0Hex was well fitted by an equation taking into account the Zeeman energy at the surface of an antiferromagnet as well as an antiferromagnetic exchange coupling. The results strongly suggest that (1) Cr2O3 surface spin is affected by the external magnetic field and (2) the coupling at the Cr2O3/Pt/Co interface is antiferromagnetic.

本文言語English
論文番号212406
ジャーナルApplied Physics Letters
105
21
DOI
出版ステータスPublished - 2014 11月 24

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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