Temperature dependence of spin Hall magnetoresistance in thin YIG/Pt films

Marmion, S. R.; Ali, M.; McLaren, Mathew; Williams, D. A.; Hickey, B. J.

doi:10.1103/physrevb.89.220404

Cited by 119 publications

(112 citation statements)

References 20 publications

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“…Upon decreasing the temperature, the SMR persists down to 10 K, with the amplitudes monotonically decreasing from 7. shorter spin diffusion length, and larger electrical resistivity of IrMn. 9,12,29 The temperature characteristics of SMR amplitudes in Pt/IrMn/YIG are significantly different from the Pt/YIG or Pd/YIG bilayers, where the SMR amplitudes exhibit nonmonotonic temperature dependence and acquire a maximum around 100 K. 31,32 For Pt/YIG, the temperature dependence of SMR amplitude can be described by a single spinrelaxation mechanism. 31 The spin diffusion length is defined as λ = Dτ sf , where D and τ sf are diffusion constant and spin-flip relaxation time, respectively.…”

Section: 30mentioning

confidence: 99%

Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

Shang

Yang

Zhan

et al. 2016

Journal of Applied Physics

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We report an investigation of temperature and IrMn layered thickness dependence of anomalous-Hall resistance (AHR), anisotropic magnetoresistance (AMR), and magnetization on Pt/Ir 20 Mn 80 /Y 3 Fe 5 O 12 (Pt/IrMn/YIG) heterostructures. The magnitude of AHR is dramatically enhanced compared with Pt/YIG bilayers. The enhancement is much more profound at higher temperatures and peaks at the IrMn thickness of 3 nm. The observed spin-Hall magnetoresistance (SMR) in the temperature range of 10-300 K indicates that the spin current generated in the Pt layer can penetrate the entire thickness of the IrMn layer to interact with the YIG layer. The lack of conventional anisotropic magnetoresistance (CAMR) implies that the insertion of the IrMn layer between Pt and YIG efficiently suppresses the magnetic proximity effect (MPE) on induced Pt moments by YIG. Our results suggest that the dual roles of the IrMn insertion in Pt/IrMn/YIG heterostructures are to block the MPE and to transport the spin current between Pt and YIG layers. We discuss possible mechanisms for the enhanced AHR.

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Section: 30mentioning

confidence: 99%

Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

Shang

Yang

Zhan

et al. 2016

Journal of Applied Physics

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“…The advantage of using FMIs against metallic ones is that the flow of charge currents is avoided, thus preventing ohmic losses or the emergence of undesired spurious effects. Some phenomena explored in insulating spintronics include the spin pumping [2][3][4][5], the spin Hall magnetoresistance (SMR) [5][6][7][8][9][10][11][12][13][14][15], the spin Seebeck effect [5,[16][17][18], the spin Peltier effect [19], the magnetic gating of pure spin currents [20,21] or the magnon spin transport (MST) [2,[22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Competing effects at Pt/YIG interfaces: Spin Hall magnetoresistance, magnon excitations, and magnetic frustration

Vélez

Bedoya-Pinto

et al. 2016

Phys. Rev. B

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We study the spin Hall magnetoresistance (SMR) and the magnon spin transport (MST) in Pt/Y3Fe5O12(YIG)-based devices with intentionally modified interfaces. Our measurements show that the surface treatment of the YIG film results in a slight enhancement of the spin-mixing conductance and an extraordinary increase in the efficiency of the spin-to-magnon excitations at room temperature. The surface of the YIG film develops a surface magnetic frustration at low temperatures, causing a sign change of the SMR and a dramatic suppression of the MST. Our results evidence that SMR and MST could be used to explore magnetic properties of surfaces, including those with complex magnetic textures, and stress the critical importance of the non-magnetic/ferromagnetic interface properties in the performance of the resulting spintronic devices.

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“…properties is quite different from that of the observed LSSE signal, which suggests that there is likely no significant correlation between them. The temperature dependence of the spin Hall angle in Pt has been recently measured 36 and shown to be approximately constant between 10 K and 300 K. Furthermore, the spin mixing conductance at the YIG/Pt interface is considered temperature independent for the purposes of this study, since we remain far below the ferrimagnetic transition temperature of 550K in YIG 37 .…”

Section: Rawmentioning

confidence: 99%

Effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets

et al. 2015

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We study the temperature dependence of the longitudinal spin-Seebeck effect (LSSE) in a yttrium iron garnet Y 3 Fe 5 O 12 (YIG) / Pt system for samples of different thicknesses. In this system, the thermal spin torque is magnon-driven. The LSSE signal peaks at a specific temperature that depends on the YIG sample thickness. We also observe freeze-out of the LSSE signal at high magnetic fields, which we attribute to the opening of an energy gap in the magnon dispersion. We observe partial freeze-out of the LSSE signal even at room temperature, where k B T is much larger than the gap. This suggests that a subset of the magnon population with an energy below k B T C (T C ∼ 40 K) contribute disproportionately to the LSSE; at temperatures above T C , we label these magnons subthermal magnons. The T-dependence of the LSSE at temperatures below the maximum is interpreted in terms of a new empirical model that ascribes most of the temperature dependence to that of the thermally driven magnon flux.2

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Temperature dependence of spin Hall magnetoresistance in thin YIG/Pt films

Cited by 119 publications

References 20 publications

Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

Competing effects at Pt/YIG interfaces: Spin Hall magnetoresistance, magnon excitations, and magnetic frustration

Effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets

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