Strong interfacial exchange field in a heavy metal/ferromagnetic insulator system determined by spin Hall magnetoresistance

Abstract

Spin-dependent transport at heavy metal/magnetic insulator interfaces is at the origin of many phenomena at the forefront of spintronics research. A proper quantification of the different interfacial spin conductances is crucial for many applications. Here, we report the first measurement of the spin Hall magnetoresistance (SMR) of Pt on a purely ferromagnetic insulator (EuS). We perform SMR measurements in a wide range of temperatures and fit the results by using a microscopic model. From this fitting procedure we obtain the temperature dependence of the spin conductances ($G_s$, $G_r$ and $G_i$), disentangling the contribution of field-like torque ($G_i$), damping-like torque ($G_r$), and spin-flip scattering ($G_s$). An interfacial exchange field of the order of 1 meV acting upon the conduction electrons of Pt can be estimated from $G_i$, which is at least three times larger than $G_r$ below the Curie temperature. Our work provides an easy method to quantify this interfacial spin-splitting field, which play a key role in emerging fields such as superconducting spintronics and caloritronics, and topological quantum computation.

arXiv comment15 pages, 3 figures, Supporting information included at the end

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Cited by in corpus (17)

• Direct Observation of a Superconducting Vortex Diode
• Coexistence of superconductivity and spin-splitting fields in superconductor/ferromagnetic insulator bilayers of arbitrary thickness
• Paramagnetic spin Hall magnetoresistance
• Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors
• Dependence of the electronic structure of the EuS/InAs interface on the bonding configuration
• Third Harmonic Characterization of Antiferromagnetic Heterostructures
• Quantifying the spin mixing conductance of EuO/W heterostructures by spin Hall magnetoresistance experiments
• Nonlinear $\sigma$-model for disordered systems with intrinsic spin-orbit coupling
• Theory of spin-Hall magnetoresistance in the AC (terahertz) regime
• Nonreciprocal superconducting transport and the spin Hall effect in gyrotropic structures
• Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films
• Spin mixing conductance and spin magnetoresistance of iridate/manganite interface
• Realisation of de Gennes${}^{\prime }$ Absolute Superconducting Switch with a Heavy Metal Interface
• Spin Hall magnetoresistance effect from a disordered interface
• Non-local magnon-based transport in yttrium iron garnet/platinum heterostructures at high temperatures
• Electrical detection of interfacial exchange field at the (ferromagnetic insulator)|(normal metal) interface using spin-dependent scattering
• Percolative supercurrent in superconductor-ferromagnetic insulator bilayers