Observation of magnon-mediated electric current drag at room temperature

Wu, Hao; Wan, Caihua; Zhang, X.; Yuan, Zhen; Zhang, Q. T.; Qin, Jian; Wei, He; Han, X. F.; Zhang, S.

doi:10.1103/physrevb.93.060403

Cited by 86 publications

(42 citation statements)

References 39 publications

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“…If the ferromagnetic layer is conducting, such variation in magnon density will in turn alter the scattering rate of the electrons in the ferromagnetic layer and hence change the total resistance of the bilayer accordingly. [35][36][37][38][39][40][41] † Similar nonlinear spin current was also proposed 43,44 recently in other systems with broken inversion symmetry. When an external electric field E is applied along a certain direction in the momentum space (dash-dotted line), a nonlinear pure spin current js(E 2 ) is generated at the second order in E, due to spin-momentum locking.…”

Section: Model Hamiltoniansupporting

confidence: 69%

Theory of bilinear magneto-electric resistance from topological-insulator surface states

Zhang¹,

Vignale²

2018

Spintronics XI

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We theoretically investigate a new kind of nonlinear magnetoresistance on the surface of three-dimensional topological insulators (TIs). At variance with the unidirectional magnetoresistance (UMR) effect in magnetic bilayers, this nonlinear magnetoresistance does not rely on a conducting ferromagnetic layer and scales linearly with both the applied electric and magnetic fields; for this reason, we name it bilinear magneto-electric resistance (BMER). We show that the sign and the magnitude of the BMER depends sensitively on the orientation of the current with respect to the magnetic field as well as the crystallographic axes -a property that can be utilized to map out the spin texture of the topological surface states via simple transport measurement, alternative to the angle-resolved photoemission spectroscopy (ARPES).

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Section: Model Hamiltoniansupporting

confidence: 69%

Theory of bilinear magneto-electric resistance from topological-insulator surface states

Zhang¹,

Vignale²

2018

Spintronics XI

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“…This work demonstrates that incoherent magnons created electrically can also be used as an information carrier on a relatively long length scale, typically about 10 µm. Later this effect was compared with the spin Hall magnetoresistance (SMR) [32] and also observed in a vertical geometry [33,34]. In contrast to the auto-oscillation driven by the STT, this method was demonstrated to be a linear process [25,31,33,34] with respect to the injected current.…”

Section: Introductionmentioning

confidence: 98%

Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons

et al. 2016

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We studied the nonlocal transport behavior of both electrically and thermally excited magnons in yttrium iron garnet (YIG) as a function of its thickness. For electrically injected magnons, the nonlocal signals decrease monotonically as the YIG thickness increases. For the nonlocal behavior of the thermally generated magnons, or the nonlocal spin Seebeck effect (SSE), we observed a sign reversal which occurs at a certain heater-detector distance, and it is influenced by both the opacity of the YIG/heater interface and the YIG thickness. Our nonlocal SSE results can be qualitatively explained by the bulk-driven SSE mechanism together with the magnon diffusion model. Using a two-dimensional finite element model (2D-FEM), we estimated the bulk spin Seebeck coefficient of YIG at room temperature. The quantitative disagreement between the experimental and modeled results indicates more complex processes going on in addition to magnon diffusion and relaxation, especially close to the contacts.

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“…[6][7][8][9] Another demonstration of magnons as the angular momentum carriers had recently been achieved in a trilayer Pt/YIG/Pt where the electron spin current in one of the Pt layers can propagate to the other Pt layer mediated by the magnon current in the insulating ferromagnetic YIG layer. [10][11][12] In addition to the magnon transport in ferromagnets, magnons in antiferromagnetic materials such as NiO are also capable of carrying an angular momentum current as reported in trilayer structure YIG/NiO/Pt. [13][14][15][16][17] Besides the above experiments, there are a number of existing theoretical studies on magnon transport.…”

mentioning

confidence: 94%

Giant magneto-spin-Seebeck effect and magnon transfer torques in insulating spin valves

Cheng

Chen

Zhang

2018

Applied Physics Letters

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We theoretically study magnon transport in an insulating spin valve (ISV) made of an antiferromagnetic insulator sandwiched between two ferromagnetic insulator (FI) layers. In the conventional metal-based spin valve, the electron spins propagate between two metallic ferromagnetic layers, giving rise to giant magnetoresistance and spin transfer torque. Here, the incoherent magnons in the ISV serve as angular momentum carriers and are responsible for the angular momentum transport between two FI layers across the antiferromagnetic spacer. We predict two transport phenomena in the presence of the temperature gradient: a giant magneto-spin-Seebeck effect in which the output voltage signal is controlled by the relative orientation of the two FI layers and magnon transfer torque that can be used for switching the magnetization of the FI layers with a temperature gradient of the order of 0.1 Kelvin per nanometer.

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Observation of magnon-mediated electric current drag at room temperature

Cited by 86 publications

References 39 publications

Theory of bilinear magneto-electric resistance from topological-insulator surface states

Theory of bilinear magneto-electric resistance from topological-insulator surface states

Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons

Giant magneto-spin-Seebeck effect and magnon transfer torques in insulating spin valves

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