Fig. 1: Experimental geometry and first harmonic results.
From: Third harmonic characterization of antiferromagnetic heterostructures
Schematics of a a Pt/α-Fe2O3 Hall cross with a 5 μm channel width, b two spin sublattices \({{{{{{\bf{m}}}}}}}_{{{{{{\bf{A}}}}}}{{{{{\boldsymbol{(}}}}}}{{{{{\bf{B}}}}}}{{{{{\boldsymbol{)}}}}}}}\), and c unit vector of Néel order \({{{{{\bf{n}}}}}}\) and net magnetization \({{{{{\bf{m}}}}}}\) of α-Fe2O3 in the presence of an in-plane magnetic field H within a spherical coordinate system with polar angle \(\theta\) and azimuthal angle \(\varphi\) for each of the vectors: \({{{{{{\bf{m}}}}}}}_{{{{{{\bf{A}}}}}}}\) (red), \({{{{{{\bf{m}}}}}}}_{{{{{{\bf{B}}}}}}}\) (purple), \({{{{{\bf{n}}}}}}\) (blue), \({{{{{\bf{m}}}}}}\) (magenta), and H (green). d In plane angular dependence of first harmonic Hall voltage \({V}_{1{\omega }}\) for a Pt(5 nm)/α-Fe2O3(30 nm) bilayer at different magnetic fields from 0.3 to 14 T at 300 K. e Field dependence of transverse spin Hall magnetoresistance voltage \({V}_{{{{{{\rm{TSMR}}}}}}}\) extracted from the fitting in d by Eq. (1).
