Exchange bias due to coupling between coexisting antiferromagnetic and spin-glass orders

Eran Maniv, Ryan A. Murphy, Shannon C. Haley, Spencer Doyle, Caolan John, Ariel Maniv, Sanath K. Ramakrishna, Yun Long Tang, Peter Ercius, Ramamoorthy Ramesh, Arneil P. Reyes, Jeffrey R. Long, James G. Analytis

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Exchange bias is a property of widespread technological utility, but its underlying mechanism remains elusive, in part because it is rooted in the interaction of coexisting order parameters in the presence of complex magnetic disorder. Here we show that a giant exchange bias housed within a spin-glass phase arises in a disordered antiferromagnet. The magnitude and robustness of the exchange bias emerges from a convolution of two energetic landscapes, namely the highly degenerate landscape of the spin glass biased by the sublattice spin configuration of the antiferromagnet. The former provides a source of uncompensated moment, whereas the latter provides a mechanism for its pinning, which leads to the exchange bias. Tuning the relative strengths of the spin-glass and antiferromagnetic order parameters reveals a principle for tailoring the exchange bias, with potential applications to spintronic technologies.

Original languageEnglish
Pages (from-to)525-530
Number of pages6
JournalNature Physics
Volume17
Issue number4
DOIs
StatePublished - 1 Apr 2021
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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