Oscillatory Interlayer Exchange Coupling and Its Temperature Dependence in [Pt/Co]3/NiO/[Co/Pt]3 Multilayers with Perpendicular Anisotropy

Z. Y. Liu and S. Adenwalla
Phys. Rev. Lett. 91, 037207 – Published 17 July 2003

Abstract

Interlayer exchange coupling that oscillates between antiferromagnetic and ferromagnetic as a function of NiO thickness has been observed in [Pt(5   Å)/Co(4   Å)]3/NiO(tNiO   Å)/[Co(4   Å)/Pt(5   Å)]3 multilayers with out-of-plane anisotropy. The period of oscillation corresponds to 2 monolayers of NiO. This oscillatory behavior is possibly attributed to the antiferromagnetic ordering in NiO. The antiferromagnetic interlayer exchange coupling for the 11   Å NiO layer shows an increase in coupling strength with increasing temperature, in agreement with the quantum interference model of Bruno for insulating spacer layers. A coexistence of exchange biasing and antiferromagnetic interlayer exchange coupling has been observed below T=250   K.

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  • Received 11 February 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.037207

©2003 American Physical Society

Authors & Affiliations

Z. Y. Liu and S. Adenwalla

  • Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111, USA

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Issue

Vol. 91, Iss. 3 — 18 July 2003

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