Magnons versus electrons in thermal spin transport through metallic interfaces

Beens, Maarten; Heremans, Joseph P.; Tserkovnyak, Yaroslav; Duine, R. A.

doi:10.1088/1361-6463/aad520

Cited by 12 publications

(19 citation statements)

References 19 publications

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“…In a more complete description, the d electrons are described as a magnonic system and the s-d interaction corresponds to electron-magnon scattering [19]. That has the advantage that spin transport driven by magnon transport can be included, which is expected to give a non-negligible contribution to the spin transport at the interface between a ferromagnetic and nonmagnetic metal [34]. In that case, the electronic and magnonic contribution to the spin transport can be treated on an equal footing by introducing a magnon chemical potential [34,35].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…That has the advantage that spin transport driven by magnon transport can be included, which is expected to give a non-negligible contribution to the spin transport at the interface between a ferromagnetic and nonmagnetic metal [34]. In that case, the electronic and magnonic contribution to the spin transport can be treated on an equal footing by introducing a magnon chemical potential [34,35]. This description should allow for both chemical potential gradients and thermal gradients.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Imposing that there is no charge transport, the spin current density can be expressed as j s = −(σ /e 2 )∂μ s /∂x [28,33], withσ = 2σ ↑ σ ↓ /(σ ↑ + σ ↓ ) and σ ↑,↓ the spin-dependent electrical conductivity. Combining this with the continuity equations for spin-up and -down electrons [28,34], gives that introducing diffusive spin transport in Eq. (6) leads to [28]…”

Section: F/n Structures: Diffusive Spin Transportmentioning

confidence: 99%

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s−d model for local and nonlocal spin dynamics in laser-excited magnetic heterostructures

2020

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

Section: F/n Structures: Diffusive Spin Transportmentioning

confidence: 99%

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s−d model for local and nonlocal spin dynamics in laser-excited magnetic heterostructures

2020

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“…Spin caloritronics 1 , which is a field triggered by observation of the spin Seebeck effect 2 , may help control heat by using spin or magnetization in materials. Among a variety of spin-caloritronic and magneto-thermoelectric phenomena, the spin Peltier effect (SPE) 3–6 and the anomalous Ettingshausen effect (AEE) 7 are candidates for active thermal management. One of their novel points is the controllability of a heat current J q with a magnetic field or a magnetization M .…”

Section: Introductionmentioning

confidence: 99%

Strain-induced switching of heat current direction generated by magneto-thermoelectric effects

Ota

Uchida

Iguchi

et al. 2019

Sci Rep

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Since the charge current plays a major role in information processing and Joule heating is inevitable in electronic devices, thermal management, i.e., designing heat flows, is required. Here, we report that strain application can change a direction of a heat current generated by magneto-thermoelectric effects. For demonstration, we used metallic magnets in a thin-film form, wherein the anomalous Ettingshausen effect mainly determines the direction of the heat flow. Strain application can alter the magnetization direction owing to the magnetoelastic effect. As a result, the heat current, which is in the direction of the cross product of the charge current and the magnetization vector, can be switched or rotated simply by applying a tensile strain to the metallic magnets. We demonstrate 180° switching and 90° rotation of the heat currents in an in-plane magnetized Ni sample on a rigid sapphire substrate and a perpendicularly magnetized TbFeCo film on a flexible substrate, respectively. An active thermography technique was used to capture the strain-induced change in the heat current direction. The method presented here provides a novel method for controlling thermal energy in electronic devices.

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“…Consequently, a magnon current would flow across the AFI barrier from one FM electrode to the other, exerting a magnon transfer torque on the free magnetization layer. Theoretically, the magnon current driven by temperature gradient has already studied in details [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Amplification of spin-transfer torque in magnetic tunnel junctions with an antiferromagnetic barrier

2019

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We theoretically study spin transfer torques in magnetic tunnel junctions (MTJs) with an antiferromagnetic insulator (AFI) as the tunnel barrier. When a finite voltage bias is applied to the MTJ, the energy relaxation of the tunnel electrons leads to asymmetric heating of two metallic layers. Consequently, there would be a magnon current flowing across the AFI layer, resulting a magnon transfer torque in addition to the electron spin transfer torque. Comparing to MTJs with a non-magnetic insulator which prohibits the magnon transmission, we find the magnon transfer torque with an AFI barrier could be several times larger than the conventional spin transfer torque of the tunnel electrons. This study presents a potential method to realize more efficient switching in MTJs and provides a motivation of experimental search for AFI-based MTJs.

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Magnons versus electrons in thermal spin transport through metallic interfaces

Cited by 12 publications

References 19 publications

s−d model for local and nonlocal spin dynamics in laser-excited magnetic heterostructures

s−d model for local and nonlocal spin dynamics in laser-excited magnetic heterostructures

Strain-induced switching of heat current direction generated by magneto-thermoelectric effects

Amplification of spin-transfer torque in magnetic tunnel junctions with an antiferromagnetic barrier

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