Disclosing antiferromagnetism in tetragonal Cr2O3 by electrical measurements

Abstract

The tetragonal phase of chromium (III) oxide, although unstable in the bulk, can be synthesized in epitaxial heterostructures. The theoretical investigation by density functional theory predicts an antiferromagnetic ground state for this compound. We demonstrate experimentally antiferromagnetism up to 40 K in ultrathin films of t-Cr2O3 by electrical measurements exploiting interface effect within a neighboring ultrathin Pt layer. We show that magnetotransport in Pt is affected by both spin-Hall magnetoresistance and magnetic proximity effect while we exclude any role of magnetism for the low-temperature resistance anomaly observed in Pt.

arXiv comment23 pages, 5 figures, Accepted in PRB (2019)

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• Inducing ferromagnetism and Kondo effect in platinum by paramagnetic ionic gating
• Finite-size scaling effect on Néel temperature of antiferromagnetic Cr${}_2$O${}_3$-(0001) films in an exchange-coupled heterostructure
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