Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films

Abstract

We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. We observe a large enhancement of both signals below the spin-spiral (Ts = 28 K) and the spin lock-in transitions (T_{lock_in} = 14 K). The SMR and SSE response in the spin lock-in phase are one order of magnitude larger than those observed at the ferrimagnetic transition temperature (Tc = 94 K), which indicates that the interaction between spins at the Pt|CCO interface is more efficient in the non-collinear magnetic state below Ts and T_{lock-in}. At T > Tc, magnetic field-induced SMR and SSE signals are observed, which can be explained by a high interface susceptibility. Our results show that the spin transport at the Pt|CCO interface is sensitive to the magnetic phases but cannot be explained solely by the bulk magnetization.

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• Spin Seebeck insulator
• Theory of spin Hall magnetoresistance
• Dielectric anomalies and spiral magnetic order in CoCr2O4
• Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
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• Quantitative Temperature Dependence of Longitudinal Spin Seebeck Effect at High Temperatures
• Surface sensitivity of the spin Seebeck effect
• Paramagnetic spin pumping
• Origin of the spin Seebeck effect probed by temperature dependent measurements in Gd${}_3$Fe${}_5$O${}_{12}$

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