Strong perpendicular exchange bias in sputter-deposited CoPt/CoO multilayers

J. Wang, T. Omi, T. Sannomiya, S. Muraishi, J. Shi, Y. Nakamura

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Strong perpendicular exchange bias was realized in sputter-deposited CoPt/CoO multilayers. The as-deposited multilayer shows strong perpendicular magnetic anisotropy (PMA) which remains up to a critical CoPt layer thickness as thick as 4 nm. After perpendicular field cooling, the multilayer with antiferromagnetic CoO and ferromagnetic CoPt interfaces exhibits large perpendicular exchange bias of 1730 Oe. Strong PMA in the CoPt/CoO multilayer is mainly attributed to the positive magnetoelastic energy due to the remarkable in-plane tensile stress originating from the local epitaxial growth. The mechanism for the exchange bias was explained in terms of the interfacial spin structure.

Original languageEnglish
Article number042401
JournalApplied Physics Letters
Volume103
Issue number4
DOIs
Publication statusPublished - 2013 Jul 22

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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