Nonreciprocal spin Seebeck effect in antiferromagnets

Takashima, R.; Shiomi, Yuki; Motome, Yukitoshi

doi:10.1103/physrevb.98.020401

Cited by 36 publications

(23 citation statements)

References 33 publications

(50 reference statements)

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“…In such situations, however, the magnon excitations in the antiferromagnet can contribute to the thermal transport. In particular, it was shown that the Dzyaloshinskii-Moriya interaction on the second-neighbor bonds leads to nonlinear thermal transport [45][46][47]. However, as the Dzyaloshinskii-Moriya interaction arises from the spin-orbit coupling, one may suppress the magnon contribution by choosing the antiferromagnets with less spin-orbit coupling.…”

Section: Contributions From Magnonsmentioning

confidence: 99%

Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field

Nakazawa,

Kato,

Motome

2022

Preprint

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We present the theoretical results for the Majorana band structure and thermal transport properties in the Kitaev honeycomb model under a staggered magnetic field in addition to a uniform one. The Majorana band structure is asymmetrically modulated in momentum space, and the valley degree of freedom is activated and controlled by the magnitudes and directions of the uniform and staggered magnetic fields; as a result, the Majorana excitation is either gapped or gapless, the latter of which in general has Majorana Fermi surfaces, in contrast to the point nodes in the absence of the fields. We show that the asymmetric deformation of the Majorana band induces a nonlinear (nonreciprocal) thermal transport, in addition to the linear one. The field dependence of the linear thermal current is correlated with the magnitude of the Majorana gap, while that of the nonlinear thermal current is associated with the asymmetry of the Majorana excitation spectra. We show the estimates of the thermal currents and discuss that the linear response is experimentally measurable, whereas future improvement is required for the observation of the nonlinear one. We also discuss how the thermal currents are modulated by other additional effects of the magnetic field and contributions from conventional magnons, latter of which are expected in heterostructures to realize an internal staggered magnetic field.

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Section: Contributions From Magnonsmentioning

confidence: 99%

Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field

Nakazawa,

Kato,

Motome

2022

Preprint

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“…Although they were mainly studied for ferromagnetic slabs [48,49] and for magnetic orderings in the noncentrosymmetric crystals [50,51,59,71,72], where the magnetic dipolar interaction and/or the Dzyaloshinskii-Moriya (DM) interaction are important [73,74], it was shown that they occur even via other mechanisms, such as frustrated exchange interactions [75,76] and bond-dependent symmetric exchange interactions [77,78]. The nonreciprocal magnons have a potential to exhibit further intriguing nonreciprocal phenomena, such as the magneto-optical effect [79][80][81] and spin Seebeck effect [82], which avoid Joule heating.…”

Section: Introductionmentioning

confidence: 99%

Essential model parameters for nonreciprocal magnons in multisublattice systems

Hayami,

Matsumoto

2021

Preprint

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We theoretically investigate the microscopic conditions for emergent nonreciprocal magnons toward unified understanding on the basis of a microscopic model analysis. We show that the products of the Bogoliubov Hamiltonian obtained within the linear spin wave approximation is enough to obtain the momentum-space functional form and the key ingredients in the nonreciprocal magnon dispersions in an analytical way even without solving the eigenvalue problems. We find that the odd order of an effective antisymmetric Dzyaloshinskii-Moriya interaction and/or the even order of an effective symmetric anisotropic interaction in the spin rotated frame can be a source of the antisymmetric dispersions. We present possible kinetic paths of magnons contributing to the antisymmetric dispersions in the one-to four-sublattice systems with the general exchange interactions. We also test the formula for both ferromagnetic and antiferromagnetic orderings in the absence of spatial inversion symmetry.

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“…In this respect, several proposals to rectify the spin currents in magnets have been put forward. [ 16–20 ] For example, it was shown that in a magnetic insulator with anisotropic exchange interaction the spin current can be manipulated by tuning the magnetic field. [ 16 ] Moreover, rectification of spin currents generated via the spin Seebeck effect has been reported in some recent works, [ 17,18 ] where the rectification lies in the fact that the systems exhibit asymmetry in the spectrum of magnetic excitations or in the structure.…”

Section: Introductionmentioning

confidence: 99%

Rectification of Spin Currents in a Metal/Insulator/Metal Heterostructure

Yan

Jiang

Zhao

2020

Physica Status Solidi (b)

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Rectification of spin currents is investigated theoretically in a normal‐metal/ferromagnetic‐insulator/normal‐metal heterostructure. The ferromagnetic insulator is assumed to have an anisotropic parameter of Δ > 1, and thus it is gapped. In the presence of a magnetic field along the z‐direction, the ground state becomes the one with all spins pointing upward (in the z‐direction). When a spin‐up polarized current is incident from the left metal, it is suppressed due to spin blockade; however, the spin‐down polarized current can pass through the insulator easily. Thus rectification of spin currents can be realized and it is found that the rectification coefficient can be up to ≈10 (or even higher) in the limit of low temperature or large energy gap. It can be further improved when the spin system is asymmetrically coupled with the metals. The results could be useful in spintronics based on magnetic insulators.

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Nonreciprocal spin Seebeck effect in antiferromagnets

Cited by 36 publications

References 33 publications

Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field

Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field

Essential model parameters for nonreciprocal magnons in multisublattice systems

Rectification of Spin Currents in a Metal/Insulator/Metal Heterostructure

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