Microscopic theory of magnon-drag electron flow in ferromagnetic metals

Yamaguchi, Tadatoshi; Kohno, Hiroshi; Duine, R. A.

doi:10.1103/physrevb.99.094425

Cited by 11 publications

(5 citation statements)

References 33 publications

(58 reference statements)

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“…This gives rise to a magnon spin-current [39]. Likewise, a ferromagnetic metal with a temperature gradient will host flow of both electrons and magnons coupled together through drag effects [40][41][42][43]. Coupling of flow of electrons and magnons has also been investigated in noncollinear antiferromagnetic metals [44].…”

Section: Introductionmentioning

confidence: 99%

Magnon drag in a metal-insulating antiferromagnet bilayer

Erlandsen,

Sudbø

2022

Preprint

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We study a bilayer structure consisting of an antiferromagnetic insulator and a normal metal. An electron current is driven in the normal metal with direction parallel to the interface between the materials. Due to interfacial exchange coupling between the localized spins in the antiferromagnet and the itinerant electrons in the normal metal, a magnon current can then be induced in the antiferromagnet. Using an uncompensated antiferromagnetic interface, creating an asymmetry in the interfacial coupling to the two degenerate magnon modes, we find that it is possible to generate a magnon spin-current. The magnon spin-current can be enhanced by increasing the temperature or by spin-splitting the magnon modes.

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Section: Introductionmentioning

confidence: 99%

Magnon drag in a metal-insulating antiferromagnet bilayer

Erlandsen,

Sudbø

2022

Preprint

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“…The contribution of the magnon drag to the Seebeck effect has been studied experimentally [15][16][17][18] and theoretically [19][20][21][22][23] from the 1960s. However, it appears that the magnon drag, related with an impurity band such as for the present alloy, is not sufficiently understood.…”

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confidence: 99%

“…Model Hamiltonian and Formulation of Electric and Thermal transports.-To study the magnon drag based on the electronic state shown in Fig. 1(c), we use a following model Hamiltonian [14,[21][22][23].…”

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confidence: 99%

“…V T τ [j e (τ )j mag Q (0)] , where τ is an imaginary time and T τ denotes the imaginary time ordering operator [22,23]. By the second order perturbation on the exchange interaction based on the Green's function of electrons, Eq.…”

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confidence: 99%

“…The vetex corrections, which are neglected in this letter for simplicity, have been discussed in ref. [23].…”

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confidence: 99%

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Theory of Huge Thermoelectric Effect Based on Magnon Drag Mechanism: Application to Thin-Film Heusler Alloy

Matsuura,

Ogata,

Mori

et al. 2021

Preprint

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To understand the unexpectedly high thermoelectric performance observed in the thin-film Heusler alloy Fe2V0.8W0.2Al, we study the magnon drag effect, generated by the tungsten based impurity band, as a possible source of this enhancement, in analogy to the phonon drag observed in FeSb2. Assuming that the thin-film Heusler alloy has a conduction band integrating with the impurity band, originated by the tungsten substitution, we derive the electrical conductivity L11 based on the self-consistent t-matrix approximation and the thermoelectric conductivity L12 due to magnon drag, based on the linear response theory, and estimate the temperature dependent electrical resistivity, Seebeck coefficient and power factor. Finally, we compare the theoretical results with the experimental results of the thin-film Heusler alloy to show that the origin of the exceptional thermoelectric properties is likely to be due to the magnon drag related with the tungsten-based impurity band.

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Magnon-drag thermoelectric transport with skyrmion structure

Hoshi

Yamaguchi

Takeuchi

et al. 2020

Applied Physics Letters

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Thermoelectric effects driven by magnetization dynamics under a temperature gradient are studied for ferromagnets with and without a skyrmion structure. We calculate charge currents in a four-terminal geometry using the adiabatic pumping formula with full account of magnetization dynamics based on the stochastic Landau–Lifshitz–Gilbert equation. The longitudinal current (Seebeck effect) is induced from the thermally driven spin waves via the spin-transfer and momentum-transfer processes, and these two processes contribute constructively (destructively) in ferromagnets having a negative (positive) s-d exchange interaction. The transverse currents (anomalous Nernst effect) arise in proportion to the number of skyrmions, whose mechanism is identified as the thermal topological Hall effect of magnons followed by the momentum-transfer drag process.

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Microscopic theory of magnon-drag electron flow in ferromagnetic metals

Cited by 11 publications

References 33 publications

Magnon drag in a metal-insulating antiferromagnet bilayer

Magnon drag in a metal-insulating antiferromagnet bilayer

Theory of Huge Thermoelectric Effect Based on Magnon Drag Mechanism: Application to Thin-Film Heusler Alloy

Magnon-drag thermoelectric transport with skyrmion structure

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