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We investigate the spin Hall magnetoresistance (SMR) at room temperature inthin film heterostructures of antiferromagnetic, insulating, (0001)-orientedalpha-Fe2O3 (hematite) and Pt. We measure their longitudinal and transverseresistivities while rotating an applied magnetic field of up to 17T in threeorthogonal planes. For out-of-plane magnetotransport measurements, we findindications for a multidomain antiferromagnetic configuration whenever thefield is aligned along the film normal. For in-plane field rotations, weclearly observe a sinusoidal resistivity oscillation characteristic for the SMRdue to a coherent rotation of the Neel vector. The maximum SMR amplitude of0.25% is, surprisingly, twice as high as for prototypical ferrimagneticY3Fe5O12/Pt heterostructures. The SMR effect saturates at much smaller magneticfields than in comparable antiferromagnets, making the alpha-Fe2O3/Pt systemparticularly interesting for room-temperature antiferromagnetic spintronicapplications.

Large spin Hall magnetoresistance in antiferromagnetic \alpha-Fe2O3/Pt heterostructures