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

Disclosing antiferromagnetism in tetragonal Cr2O3 by electrical measurements