Nonsinusoidal angular dependence of FMR-driven spin current across an antiferromagnet in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>12</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi>NiO</mml:mi><mml:mo>/</mml:mo><mml:mi>Pt</mml:mi></mml

Cheng, Yang; Zarzuela, Ricardo; Brangham, Jack; Lee, Jun Hui; White, Shane P.; Hammel, P. C.; Tserkovnyak, Yaroslav; Yang, Fengyuan

doi:10.1103/physrevb.99.060405

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…To explain the sharp peaks in the γand β-scans, the small N-SMR in the β-scans, and the large N-SMR in the α-scans, we use a macrospin response model (see Supplementary Information for more details) to understand the AF spin structure in α-Fe2O3 based on the free energy [41,42],…”

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confidence: 99%

Anisotropic magnetoresistance and nontrivial spin Hall magnetoresistance in Pt/α−Fe2O3 bilayers

Cheng

Ahmed

et al. 2019

Phys. Rev. B

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To date, magnetic proximity effect (MPE) has only been conclusively observed in ferromagnet (FM) based systems. We report the observation of anomalous Hall effect and anisotropic magnetoresistance in angular dependent magnetoresistance (ADMR) measurements in Pt on antiferromagnetic (AF) α-Fe2O3(0001) epitaxial films at 10 K, which provide evidence for the MPE. The Néel order of α-Fe2O3 and the induced magnetization in Pt show a unique ADMR compared with all other FM and AF systems. A macrospin response model is established and can explain the AF spin configuration and all main ADMR features in the Pt/α-Fe2O3 bilayers.

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confidence: 99%

Anisotropic magnetoresistance and nontrivial spin Hall magnetoresistance in Pt/α−Fe2O3 bilayers

Cheng

Ahmed

et al. 2019

Phys. Rev. B

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“…So, these phenomena demonstrate that in antiferromagnetic insulators, the spins are transported dominantly by incoherent thermal magnons rather than coherent THz AFM dynamics. [7,9,[26][27][28] In addition, our experimental results in Fig. 3(b) show that I c is strongly suppressed towards lower temperatures.…”

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confidence: 53%

Temperature dependence of spin pumping in YIG/NiO(x)/W multilayer

Ni¹,

Wang²,

Jin³

et al. 2022

Chinese Phys. B

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We report the temperature dependence of the spin pumping effect for Y3Fe5O12 (YIG, 0.9 μm)/NiO (t NiO nm)/W (6 nm) (t NiO = 0, 1, 2, 10 nm) heterostructures. All samples exhibit a strong temperature-dependent the inverse spin Hall effect (ISHE) signal I c and sensitivity to the NiO layer thickness. We observe a dramatic decrease of I c with inserting thin NiO layer between YIG and W layers indicating that the inserting NiO layer significantly suppresses the spin transport from YIG to W. In contrast to noticeable enhancement in YIG/NiO (t NiO ≈ 1-2 nm)/Pt, the suppression of spin transport may be closely related to the specific interface-dependent spin scattering, spin memory loss, and spin conductance at the NiO/W interface. Besides, the I c of YIG/NiO/W exhibits a maximum near the T N of the AF NiO layer, which is due to the spins are transported dominantly by incoherent thermal magnons.

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“…The strength of SMR is on the order of θ 2 SH , where θ SH is the spin Hall angle. Recently, SMR has been reported for the bilayer system composed of NM and an antiferromagnetic insulator (AFI) [19][20][21][22][23][24][25] , where the orientation of the Néel vector of AFI has been changed by a strong external field or by the orientation of magnetization of FI using the NM/AFI/FI trilayer structure. The sign of SMR is opposite to the one in the NM/FI bilayer system with respect to the external magnetic field.…”

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confidence: 99%

Microscopic Theory of the Spin Hall Magnetoresistance

Kato,

Ohnuma,

Matsuo

2020

Preprint

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We consider a microscopic theory for the spin Hall magnetoresistance (SMR). We generally formulate a spin conductance at an interface between a normal metal and a magnetic insulator in terms of spin susceptibilities. We reveal that SMR is composed of static and dynamic parts. The static part, which is almost independent of the temperature, originates from spin flip caused by an interfacial exchange coupling. However, the dynamic part, which is induced by the creation or annihilation of magnons, has an opposite sign from the static part. By the spin-wave approximation, we predict that the latter results in a nontrivial sign change of the SMR signal at a finite temperature. In addition, we derive the Onsager relation between spin conductance and thermal spin-current noise.

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Nonsinusoidal angular dependence of FMR-driven spin current across an antiferromagnet in Y3Fe5O12/NiO/Pt

Cited by 9 publications

References 32 publications

Anisotropic magnetoresistance and nontrivial spin Hall magnetoresistance in Pt/α−Fe2O3 bilayers

Anisotropic magnetoresistance and nontrivial spin Hall magnetoresistance in Pt/α−Fe2O3 bilayers

Temperature dependence of spin pumping in YIG/NiO(x)/W multilayer

Microscopic Theory of the Spin Hall Magnetoresistance

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