Simultaneous Detection Of The Spin Hall Magnetoresistance And Joule Heating-Induced Spin Seebeck Effect In Gd3fe5o12/Pt Bilayers

Spin Hall magnetoresistance (SMR) provides an effective tool to probe the spin structure in magnet/heavy metal bilayers. Here, we investigate the SMR in Gd3Fe5O12 (GdIG)/Pt bilayers, where GdIG is a compensated ferrimagnetic insulator. Under a finite magnetic field, GdIG has a collinear magnetic phase far away from compensated temperature (T-comp) and noncollinear/canted magnetic phase around T-comp of 278 K. A conventional SMR behavior is observed at different temperatures without any sign change around T-comp. Meanwhile, an asymmetric behavior (unidirectional-like) exists in the observed SMR at the temperatures just above or below T-comp, because of the contribution of the anisotropic magnetothermopower effect, i.e., spin Seebeck effect. The spin Seebeck effect component exhibits a sign change around T-comp, which is correlated with the reversal of the sublattice magnetization. Our finding provides an insight into SMR and thermal spin transport in the GdIG/Pt bilayer structure. Published under license by AIP Publishing.