  An electric method for measuring magnetic anisotropy in antiferromagnetic
insulators (AFIs) is proposed. When a metallic film with strong spin-orbit
interactions, e.g., platinum (Pt), is deposited on an AFI, its resistance
should be affected by the direction of the AFI N eel vector due to the spin
Hall magnetoresistance (SMR). Accordingly, the direction of the AFI N eel
vector, which is affected by both the external magnetic field and the magnetic
anisotropy, is reflected in resistance of Pt. The magnetic field angle
dependence of the resistance of Pt on AFI is calculated by consider- ing the
SMR, which indicates that the antiferromagnetic anisotropy can be obtained
experimentally by monitoring the Pt resistance in strong magnetic fields.
Calculations are performed for realistic systems such as Pt/Cr2O3, Pt/NiO, and
Pt/CoO.
