Spin-Hall magnetoresistance in a low-dimensional magnetic insulator

Abstract

We observe an unusual behavior of the spin Hall magnetoresistance (SMR) measured in a Pt ultra-thin film deposited on a ferromagnetic insulator, which is a tensile-strained LaCoO3 (LCO) thin film with the Curie temperature Tc=85K. The SMR displays a strong magnetic-field dependence below Tc, with the SMR amplitude continuing to increase (linearly) with increasing the field far beyond the saturation value of the ferromagnet. The SMR amplitude decreases gradually with raising the temperature across Tc and remains measurable even above Tc. Moreover, no hysteresis is observed in the field dependence of the SMR. These results indicate that a novel low-dimensional magnetic system forms on the surface of LCO and that the Pt/LCO interface decouples magnetically from the rest of the LCO thin film. To explain the experiment, we revisit the derivation of the SMR corrections and relate the spin-mixing conductances to the microscopic quantities describing the magnetism at the interface. Our results can be used as a technique to probe quantum magnetism on the surface of a magnetic insulator.

Main: 12 pages, 3 figures Sup Mat: 42 pages, 10 figures

References in corpus (55)

• Spin Hall effect
• New Perspectives for Rashba Spin-Orbit Coupling
• Magnetometry with nitrogen-vacancy defects in diamond
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Spin Seebeck insulator
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Theory of spin Hall magnetoresistance
• Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces
• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Spin dynamics in semiconductors
• Comparative Measurements of Inverse Spin Hall and Magnetoresistance in YIG|Pt and YIG|Ta
• Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
• Finite-element theory of transport in ferromagnet-normal metal systems
• Spin torque study of the spin Hall conductivity and spin diffusion length in platinum thin films with varying resistivity
• Unidirectional spin Hall magnetoresistance in ferromagnet/normal metal bilayers
• Spin Hall magnetoresistance in metallic bilayers
• Experimental test of the spin mixing interface conductivity concept
• Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime
• Spin-Hall Magnetoresistance in Platinum on Yttrium Iron Garnet: Dependence on platinum thickness and in-plane/out-of-plane magnetization
• Observation of the spin Peltier effect
• Spin transfer torque on magnetic insulators
• Hanle Magnetoresistance in Thin Metal Films with Strong Spin-Orbit Coupling
• Strain-Induced Spin States in Atomically Ordered Cobaltites
• Rashba-Edelstein Magnetoresistance in Metallic Heterostructure
• Magnetoresistance due to edge spin accumulation
• Tunable sign change of spin Hall magnetoresistance in Pt/NiO/YIG structures
• Origins of the unidirectional spin Hall magnetoresistance in metallic bilayers
• Spin Hall magnetoresistance at Pt/CoFe2O4 interfaces and texture effects
• Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance
• Theory of spin Hall magnetoresistance (SMR) and related phenomena
• Spin Hall Magnetoresistance in a Canted Ferrimagnet
• Temperature dependent spin transport properties of Platinum inferred from spin Hall magnetoresistance measurements
• Magnetoresistance of heavy and light metal/ferromagnet bilayers
• Revealing the magnetic proximity effect in EuS/Al bilayers through superconducting tunneling spectroscopy
• Unveiling the mechanisms of the spin Hall effect in Ta
• Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films
• Competing effects at Pt/YIG interfaces: spin Hall magnetoresistance, magnon excitations and magnetic frustration
• Ferromagnetic insulating state in tensile-strained LaCoO${}_3$ thin films
• Spin state ordering of strongly correlating LaCoO${}_3$ induced at ultrahigh magnetic fields
• Evolution of the Spin Hall Magnetoresistance in Cr${}_2$O${}_3$/Pt bilayers close to the Néel temperature
• Spin current generation from sputtered Y3Fe5O12 films
• Paramagnetic spin pumping
• Theory of spin loss at metallic interfaces
• Theory of Spin Hall Magnetoresistance from a Microscopic Perspective
• Pure spin currents in magnetically ordered insulator/normal metal heterostructures
• Electrical detection of spiral spin structures in Pt|Cu_2OSeO_3 heterostructures
• Tensile-Strain Dependent Spin States in Epitaxial LaCoO${}_3$ Thin Films
• Intrinsic and extrinsic contributions to spin scattering in Pt
• Synthetic antiferromagnetic coupling between ultra-thin insulating garnets
• Spin Hall magnetoresistance as a probe for surface magnetization in Pt/CoFe${}_2$O${}_4$ bilayers
• Extraordinary Hall resistance and unconventional magnetoresistance in Pt/LaCoO3 hybrids
• Anomalous Hall-like transverse magnetoresistance in Au thin films on Y${}_3$Fe${}_5$O${}_{12}$
• Spin Dependent Transport in Magnetic Nanostructures
• Transport between metals and magnetic insulators

Cited by in corpus (12)

• Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures
• Theory of Spin Hall Magnetoresistance from a Microscopic Perspective
• Strong interfacial exchange field in a heavy metal/ferromagnetic insulator system determined by spin Hall magnetoresistance
• Paramagnetic spin Hall magnetoresistance
• Differences in the magnon diffusion length for electrically and thermally driven magnon currents in Y${}_3$Fe${}_5$O${}_{12}$
• Microscopic Theory of the Spin Hall Magnetoresistance
• Nonlinear $\sigma$-model for disordered systems with intrinsic spin-orbit coupling
• Role of spin mixing conductance in determining thermal spin pumping near the ferromagnetic phase transition in EuO_{1-x} and La2NiMnO6
• Current rectification in junctions with spin-split superconductors
• Spin Hall magnetoresistance effect from a disordered interface
• Non-local magnon-based transport in yttrium iron garnet/platinum heterostructures at high temperatures
• Statistical characterization of the spin Hall magnetoresistance in YIG/Pt heterostructures