Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets

Manchon, Aurélien; Ndiaye, Papa Birame; Moon, Jung Hwan; Lee, Hyun Woo; Lee, Kyung Jin

doi:10.1103/physrevb.90.224403

Cited by 35 publications

(42 citation statements)

References 66 publications

(88 reference statements)

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“…Recently, both fieldlike and antidampinglike contributions to DMI torques have been studied theoretically [14][15][16][17][18]. It has been noted [13] that DMI torques can be seen as magnon analogs of spin-orbit torques [19][20][21][22][23][24]. This suggests that the phenomenology developed for spin-orbit torques can be readily applied to DMI torques [25,26].…”

Section: Introductionmentioning

confidence: 99%

Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

Kovalev

Zyuzin

2017

Phys. Rev. B

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We formulate a microscopic linear response theory of magnon pumping applicable to multiple-magnonic-band uniform ferromagnets with Dzyaloshinskii-Moriya interactions. From the linear response theory, we identify the extrinsic and intrinsic contributions where the latter is expressed via the Berry curvature of magnonic bands. We observe that in the presence of a time-dependent magnetization Dzyaloshinskii-Moriya interactions can act as fictitious electric fields acting on magnons. We study various current responses to this fictitious field and analyze the role of Berry curvature. In particular, we obtain an analog of the Hall-like response in systems with nontrivial Berry curvature of magnon bands. After identifying the magnon-mediated contribution to the equilibrium Dzyaloshinskii-Moriya interaction, we also establish the Onsager reciprocity between the magnon mediated thermal torques and heat pumping. We apply our theory to the magnonic heat pumping and torque responses in honeycomb and kagome lattice ferromagnets.

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Section: Introductionmentioning

confidence: 99%

Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

Kovalev

Zyuzin

2017

Phys. Rev. B

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“…Manipulation based on the application of external magnetic fields [9][10][11][12][13][14][15], currents [16][17][18][19][20][21][22], and more recently magnons [23][24][25][26][27][28][29] and electric fields [30,31] has been proposed and, with the exception of magnonic manipulation, experimentally realized. There is an upper limit on the DW velocity due to the phenomenon known as Walker breakdown (WB) [9].…”

Section: Introductionmentioning

confidence: 99%

Dirac electrons and domain walls: A realization in junctions of ferromagnets and topological insulators

2015

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We study a system of Dirac electrons with finite density of charge carriers coupled to an external electromagnetic field in two spatial dimensions, with a domain wall (DW) mass term. The interface between a thin-film ferromagnet and a three-dimensional topological insulator provides a condensed-matter realization of this model, when an out-of-plane domain wall magnetization is coupled to the topological insulator surface states. We show how, for films with very weak intrinsic in-plane anisotropies, the torque generated by the edge electronic current flowing along the DW competes with an effective in-plane anisotropy energy, induced by quantum fluctuations of the chiral electrons bound to the wall, in a mission to drive the internal angle of the DW from a Bloch configuration towards a Néel configuration. Both the edge current and the induced anisotropy contribute to stabilize the internal angle, so that for weak intrinsic in-plane anisotropies DW motion is still possible without suffering from an extremely early Walker breakdown.

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“…Various features have been identified experimentally, such as large angular anisotropies [13] and complex materials dependence [14]. Innovative concepts such as spin-wave-mediated [15] and intrinsic SOTs have also been introduced [16,17], thereby broadening the field of spin-orbitronics which opens new roads * papabirame.ndiaye@kaust.edu.sa † aurelien.manchon@kaust.edu.sa for spin devices made of engineered (non)magnetic materials and operated without magnetic fields [18].…”

Section: Introductionmentioning

confidence: 99%

Dirac spin-orbit torques and charge pumping at the surface of topological insulators

et al. 2017

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CitationNdiaye We address the nature of spin-orbit torques at the magnetic surfaces of topological insulators using the linear-response theory. We find that the so-called Dirac torques in such systems possess a different symmetry compared to their Rashba counterpart, as well as a high anisotropy as a function of the magnetization direction. In particular, the damping torque vanishes when the magnetization lies in the plane of the topological-insulator surface. We also show that the Onsager reciprocal of the spin-orbit torque, the charge pumping, induces an enhanced anisotropic damping. Via a macrospin model, we numerically demonstrate that these features have important consequences in terms of magnetization switching.

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Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets

Cited by 35 publications

References 66 publications

Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet

Dirac electrons and domain walls: A realization in junctions of ferromagnets and topological insulators

Dirac spin-orbit torques and charge pumping at the surface of topological insulators

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