Magnon Spin Nernst Effect in Antiferromagnets

Zyuzin, Vladimir A.; Kovalev, Alexey A.

doi:10.1103/physrevlett.117.217203

Cited by 196 publications

(207 citation statements)

References 51 publications

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“…This effect does not rely on the presence of time-reversal symmetry breaking, unlike the thermal Hall effect (thermal analog of the Hall effect). Several recent papers (Cheng, Okamoto, and Xiao, 2016;Zyuzin and Kovalev, 2016) demonstrated the spin Nernst effect in models of honeycomb lattice magnets with Dzyaloshinski-Moriya interactions.…”

Section: A Thermally Induced Spin Currentsmentioning

confidence: 99%

Antiferromagnetic spintronics

et al. 2018

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Antiferromagnetic materials could represent the future of spintronic applications thanks to the numerous interesting features they combine: they are robust against perturbation due to magnetic fields, produce no stray fields, display ultrafast dynamics, and are capable of generating large magnetotransport effects. Intense research efforts over the past decade have been invested in unraveling spin transport properties in antiferromagnetic materials. Whether spin transport can be used to drive the antiferromagnetic order and how subsequent variations can be detected are some of the thrilling challenges currently being addressed. Antiferromagnetic spintronics started out with studies on spin transfer and has undergone a definite revival in the last few years with the publication of pioneering articles on the use of spin-orbit interactions in antiferromagnets. This paradigm shift offers possibilities for radically new concepts for spin manipulation in electronics. Central to these endeavors are the need for predictive models, relevant disruptive materials, and new experimental designs. This paper reviews the most prominent spintronic effects described based on theoretical and experimental analysis of antiferromagnetic materials. It also details some of the remaining bottlenecks and suggests possible avenues for future research. This review covers both spin-transfer-related effects, such as spin-transfer torque, spin penetration length, domain-wall motion, and "magnetization" dynamics, and spin-orbit related phenomena, such as (tunnel) anisotropic magnetoresistance, spin Hall, and inverse spin galvanic effects. Effects related to spin caloritronics, such as the spin Seebeck effect, are linked to the transport of magnons in antiferromagnets. The propagation of spin waves and spin superfluids in antiferromagnets is also covered.

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Section: A Thermally Induced Spin Currentsmentioning

confidence: 99%

Antiferromagnetic spintronics

et al. 2018

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“…1 (b). Spins of length S on each bipartite sublattice, denoted by A and B, satisfy 60,61,66 S A = −S B = Se z in the ground state. The magnet is described by the following spin Hamiltonian, 42,43 …”

Section: Topologically Trivial Afmentioning

confidence: 99%

“…[13], we developed it further into the magnonic 'quantum' Hall effect and appropriately defining the thermal conductance for bosons, we found that the magnon Hall conductances in such topological FMs obey a Wiedemann-Franz 50 (WF) law for magnon transport 4,47 . In this paper, motivated by the recent experimental 51 demonstration of thermal generation of spin currents in AFs using the spin Seebeck effect [52][53][54][55][56][57][58][59] and by the report [60][61][62] of the magnonic spin Nernst effect in AFs, we develop Ref. [46] further into the AF regime [42][43][44][45]63,64 and propose a magnonic analog of the QSHE [31][32][33][34][35]39,40 for edge states that carry helical edge magnons [ Fig.…”

mentioning

confidence: 99%

Magnonic topological insulators in antiferromagnets

et al. 2017

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Extending the notion of symmetry protected topological phases to insulating antiferromagnets (AFs) described in terms of opposite magnetic dipole moments associated with the magnetic Néel order, we establish a bosonic counterpart of topological insulators in semiconductors. Making use of the Aharonov-Casher effect, induced by electric field gradients, we propose a magnonic analog of the quantum spin Hall effect (magnonic QSHE) for edge states that carry helical magnons. We show that such up and down magnons form the same Landau levels and perform cyclotron motion with the same frequency but propagate in opposite direction. The insulating AF becomes characterized by a topological Z2 number consisting of the Chern integer associated with each helical magnon edge state. Focusing on the topological Hall phase for magnons, we study bulk magnon effects such as magnonic spin, thermal, Nernst, and Ettinghausen effects, as well as the thermomagnetic properties of helical magnon transport both in topologically trivial and nontrivial bulk AFs and establish the magnonic Wiedemann-Franz law. We show that our predictions are within experimental reach with current device and measurement techniques.

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“…Refs. [57,58] have theoretically proposed magnon spin Nernst effects in antiferromagnets [59][60][61] .…”

Section: Introductionmentioning

confidence: 99%

Spin currents and magnon dynamics in insulating magnets

Nakata¹,

Simon²,

Loss³

2017

J. Phys. D: Appl. Phys.

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Nambu-Goldstone theorem provides gapless modes to both relativistic and nonrelativistic systems. The Nambu-Goldstone bosons in insulating magnets are called magnons or spin-waves and play a key role in magnetization transport. We review here our past works on magnetization transport in insulating magnets and also add new insights, with a particular focus on magnon transport. We summarize in detail the magnon counterparts of electron transport, such as the Wiedemann-Franz law, the Onsager reciprocal relation between the Seebeck and Peltier coefficients, the Hall effects, the superconducting state, the Josephson effects, and the persistent quantized current in a ring to list a few. Focusing on the electromagnetism of moving magnons, i.e., magnetic dipoles, we theoretically propose a way to directly measure magnon currents. As a consequence of the Mermin-WagnerHohenberg theorem, spin transport is drastically altered in one-dimensional antiferromagnetic (AF) spin-1/2 chains; where the Néel order is destroyed by quantum fluctuations and a quasiparticle magnon-like picture breaks down. Instead, the low-energy collective excitations of the AF spin chain are described by a Tomonaga-Luttinger liquid (TLL) which provides the spin transport properties in such antiferromagnets some universal features at low enough temperature. Finally, we enumerate open issues and provide a platform to discuss the future directions of magnonics.PACS numbers: Review article for special issue on magnonics from J. Phys. D.

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Magnon Spin Nernst Effect in Antiferromagnets

Cited by 196 publications

References 51 publications

Antiferromagnetic spintronics

Antiferromagnetic spintronics

Magnonic topological insulators in antiferromagnets

Spin currents and magnon dynamics in insulating magnets

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