Spin accumulation at ferromagnet/nonmagnetic material interfaces

Sears, Matthew R.; Saslow, Wayne M.

doi:10.1103/physrevb.85.014404

Cited by 27 publications

(31 citation statements)

References 30 publications

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“…Here, the precise control of the temperature gradient is essential to identify and avoid spurious thermoelectric effects, in particular, in the transverse SSE configuration. [6][7][8][9] Using laser-heating of a yttrium-iron garnet/platinum hybrid structure in the longitudinal SSE configuration, Weiler et al reported spatially resolved measurements of both the anomalous Nernst effect (ANE) and the SSE. 10 In lateral FM/normal metal (NM) structures similar to the transverse SSE geometry, the effect of local temperature gradients have only been studied using Joule heating.…”

mentioning

confidence: 99%

Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures

Bieren¹,

Brandl²,

Grundler³

et al. 2013

Applied Physics Letters

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Size-dependent transition of deformation mechanism, and nonlinear elasticity in Ni3Al nanowires Appl. Phys. Lett. 102, 041902 (2013) Local magnetization profile and geometry magnetization effects in microwires as determined by magneto-optical Kerr effect J. Appl. Phys. 113, 043904 (2013) Streak spectroscopy and velocimetry of electrically exploded Ni/Al laminates J. Appl. Phys. 113, 043304 (2013) Surface-enhanced Raman scattering from finite arrays of gold nano-patches J. Appl. Phys. 113, 013103 (2013) Magnetization reversal in graded anisotropy Co/Pt multilayers: A first order reversal curve study

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mentioning

confidence: 99%

Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures

Bieren¹,

Brandl²,

Grundler³

et al. 2013

Applied Physics Letters

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“…For conditions close to equilibrium, it is particularly convenient to treat the coupled transport phenomena within the phenomenological framework of irreversible thermodynamics [20], where the Onsager reciprocity relation serves as the link between concurrent flows. Routinely used in studying the coupled transport of electrons and phonons [20][21][22], the method of irreversible thermodynamics has also been utilized in analyzing the coupled transport of heat and charge with spins [21,[23][24][25][26] .…”

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confidence: 99%

Generalized Two-Temperature Model for Coupled Phonon-Magnon Diffusion

2014

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We generalize the two-temperature model [Sanders and Walton, Phys. Rev. B, 15, 1489 (1977)] for coupled phonon-magnon diffusion to include the effect of the concurrent magnetization flow. Working within the framework of Boltzmann transport equation, we derive the constitutive equations for coupled phonon-magnon transport driven by gradients of both temperature and external magnetic fields, and the corresponding conservation laws. Our equations reduce to the original Sanders-Walton two-temperature model under a uniform external field, but predict a new magnon cooling effect driven by a non-uniform magnetic field in a homogeneous single-domain ferromagnet. We estimate the magnitude of the cooling effect in yttrium iron garnet, and show it is within current experimental reach. With properly optimized materials, the predicted cooling effect can potentially supplement the conventional magnetocaloric effect in cryogenic applications in the future.Spin caloritronics [1,2] is a nascent field of study that looks into the interaction between heat and spin. In addition to providing ways of thermally manipulating magnetization and magnetic domain walls [3][4][5] as supplements to conventional spintronics, it also holds promise of novel energy harvesting and cooling applications owing to the recent

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“…(7) and (8). Since the general solution is relatively complex for its illustration we plot the total average spin current as a function of the external magnetic field H 0 and the magnon temperature T m F .…”

Section: Fokker-planck Approach: Analytical Solution For the Spimentioning

confidence: 99%

“…One of the key observations that gave impetus to the field of spin caloritronics was the discovery of the spin Seebeck effect (SSE) 1 which amounts to the emergence of a spin current upon an externally applied thermal gradient [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] . Technologically, various SSE-based nanoelectronics devices are envisaged.…”

Section: Introductionmentioning

confidence: 99%

Magnon-driven longitudinal spin Seebeck effect in F|N and N|F|N structures: Role of asymmetric in-plane magnetic anisotropy

Chotorlishvili

Toklikishvili

Etesami

et al. 2015

Journal of Magnetism and Magnetic Materials

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The influence of an asymmetric in-plane magnetic anisotropy Kx = Ky on the thermally activated spin current is studied theoretically for two different systems; (i) the F |N system consisting of a ferromagnetic insulator (F ) in a direct contact with a nonmagnetic metal (N ), and (ii) the sandwich structure N |F |N consisting of a ferromagnetic insulating part sandwiched between two nonmagnetic metals. It is shown that when the difference between the temperatures of the two nonmagnetic metals in a N |F |N structure is not large, the spin pumping currents from the magnetic part to the nonmagnetic ones are equal in amplitude and have opposite directions, so only the spin torque current contributes to the total spin current. The spin current flows then from the nonmagnetic metal with the higher temperature to the nonmagnetic metal having a lower temperature. Its amplitude varies linearly with the difference in temperatures. In addition, we have found that if the magnetic anisotropy is in the layer plane, then the spin current increases with the magnon temperature, while in the case of an out-of-plane magnetic anisotropy the spin current decreases when the magnon temperature enhances. Enlarging the difference between the temperatures of the nonmagnetic metals, the linear response becomes important, as confirmed by analytical expressions inferred from the Fokker-Planck approach and by the results obtained upon a full numerical integration of the stochastic Landau-Lifshitz-Gilbert equation.

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Spin accumulation at ferromagnet/nonmagnetic material interfaces

Cited by 27 publications

References 30 publications

Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures

Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures

Generalized Two-Temperature Model for Coupled Phonon-Magnon Diffusion

Magnon-driven longitudinal spin Seebeck effect in F|N and N|F|N structures: Role of asymmetric in-plane magnetic anisotropy

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