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Dipole-Induced Exchange Bias

Abstract

The discovery of dipole-induced exchange bias (EB), switching from negative to positive sign, is reported in systems where the antiferromagnet and the ferromagnet are separated by a paramagnetic spacer (AFM-PM-FM). The magnitude and sign of the EB is determined by the cooling field strength and the PM thickness. The same cooling field yields negative EB for thin spacers, and positive EB for thicker ones. The EB decay profile as a function of the spacer thickness, and the change of sign, are attributed to long-ranged dipole coupling. Our model, which accounts quantitatively for the experimental results, ignores the short range interfacial exchange interactions of the usual EB theories. Instead, it retains solely the long range dipole field that allows for the coupling of the FM and AFM across the PM spacer. The experiments allow for novel switching capabilities of long range EB systems, while the theory allows to describe structures where the FM and AFM are not in atomic contact. The results provide a new approach to design novel interacting heterostructures.

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Publication details

The article was received on 26 Jul 2017, accepted on 02 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05491B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Dipole-Induced Exchange Bias

    F. Torres, R. Morales, I. K. Schuller and M. Kiwi, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05491B

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