Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems

Manchon, A.; Zelezný, J.; Miron, I. M.; Jungwirth, T.; Sinova, J.; Thiaville, A.; Garello, K.; Gambardella, P.

doi:10.48550/arxiv.1801.09636

Cited by 29 publications

(51 citation statements)

References 521 publications

(1,001 reference statements)

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“…Spin-orbit torques have been mostly investigated in magnetic multilayers involving a ferromagnet adjacent to a heavy metal (W, Ta, Pt etc. ), the latter providing the strong spin-orbit coupling necessary to sustain large spin Hall effect and inverse spin galvanic effect 6 . In recent years, the emergence of spin-orbit torque at the interface between the ferromagnet and an oxide has attracted increasing attention 28,35 .…”

Section: Discussionmentioning

confidence: 99%

“…An alternative method to generate such a torque is to exploit the spin-orbit interaction of magnetic materials or heterostructures lacking inversion symmetry 4,5 . In these systems, a metal with strong spin-orbit interaction acts as a source of non-equilibrium spin density that can in turn torque the magnetization of the free adjacent magnetic layer, a phenomenon called spin-orbit torque 6 . This torque, which does not require a reference ferromagnet, enables current-driven magnetization switching 4,5,7 and excitations 8,9 , as well as fast magnetic domain wall motion [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

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Current-driven Rashba Field in a Magnetic Quantum Well

Hariri¹,

Alawein²,

Manchon³

2019

Preprint

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Current-driven Rashba Field in a Magnetic Quantum Well

Hariri¹,

Alawein²,

Manchon³

2019

Preprint

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“…In this paper, we experimentally investigate the crossover between the 1D and 2D SHO geometries in order to elucidate the mechanisms responsible for suppression of coherent auto-oscillatory dynamics in the 2D limit. We study the current-driven [49][50][51][52][53][54][55][56][57][58][59] dynamics in SHOs made from bilayers of Pt and Permalloy (Py = Ni 80 Fe 20 ) where the anti-damping spin Hall current [60][61][62][63][64][65][66][67][68][69][70] generated in Pt is injected into the Py layer. The 1D to 2D crossover is realized via varying the wire width from the nanometer-to the micrometer-scale dimensions.…”

Section: Introductionmentioning

confidence: 99%

Dimensional crossover in spin Hall oscillators

Smith,

Sobotkiewich,

Khan

et al. 2020

Preprint

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Auto-oscillations of magnetization driven by direct spin current have been previously observed in multiple quasi-zero-dimensional (0D) ferromagnetic systems such as nanomagnets and nanocontacts. Recently, it was shown that pure spin Hall current can excite coherent auto-oscillatory dynamics in quasi-one-dimensional (1D) ferromagnetic nanowires but not in quasi-two-dimensional (2D) ferromagnetic films. Here we study the 1D to 2D dimensional crossover of current-driven magnetization dynamics in wire-based Pt/Ni80Fe20 bilayer spin Hall oscillators via varying the wire width. We find that increasing the wire width results in an increase of the number of excited auto-oscillatory modes accompanied by a decrease of the amplitude and coherence of each mode. We also observe a crossover from a hard to a soft onset of the auto-oscillations with increasing the wire width. The amplitude of auto-oscillations rapidly decreases with increasing temperature suggesting that interactions of the phase-coherent auto-oscillatory modes with incoherent thermal magnons plays an important role in suppression of the auto-oscillatory dynamics. Our measurements set the upper limit on the dimensions of an individual spin Hall oscillator and elucidate the mechanisms leading to suppression of coherent auto-oscillations with increasing oscillator size.

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“…When interfaced with magnetic materials, these mechanisms can lead to efficient spin-charge conversion. Topological insulators adjacent to magnetic materials are therefore ideal platforms for the realization of these effects 13 , i.e., charge pumping 14 and spin-orbit torque 15,16 . The recent demonstration of room temperature current-driven magnetization switching 17 and the observation of magnetic textures at these interfaces 18,19 open encouraging perspectives for the exploitation of TIs in spintronics.…”

mentioning

confidence: 99%

Induced Spin-texture at 3$d$ Transition Metal/Topological Insulator Interfaces

Laref,

Ghosh,

Tsymbal

et al. 2020

Preprint

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While some of the most elegant applications of topological insulators, such as quantum anomalous Hall effect, require the preservation of Dirac surface states in the presence of time-reversal symmetry breaking, other phenomena such as spin-charge conversion rather rely on the ability for these surface states to imprint their spin texture on adjacent magnetic layers. In this work, we investigate the spin-momentum locking of the surface states of a wide range of monolayer transition metals (3d-TM) deposited on top of Bi2Se3 topological insulators using first principles calculations. We find an anticorrelation between the magnetic moment of the 3d-TM and the magnitude of the spinmomentum locking induced by the Dirac surface states. While the magnetic moment is large in the first half of the 3d series, following Hund's rule, the spin-momentum locking is maximum in the second half of the series. We explain this trend as arising from a compromise between intra-atomic magnetic exchange and covalent bonding between the 3d-TM overlayer and the Dirac surface states. As a result, while Cr and Mn overlayers can be used successfully for the observation of quantum anomalous Hall effect or the realization of axion insulators, Co and Ni are substantially more efficient for spin-charge conversion effects, e.g. spin-orbit torque and charge pumping.

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Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems

Abstract: Spin-orbit coupling in inversion-asymmetric magnetic crystals and structures has emerged as a powerful tool to generate complex magnetic textures, interconvert charge and spin under applied current, and control magnetization dynamics. Current-induced

Cited by 29 publications

References 521 publications

Current-driven Rashba Field in a Magnetic Quantum Well

Current-driven Rashba Field in a Magnetic Quantum Well

Dimensional crossover in spin Hall oscillators

Induced Spin-texture at 3$d$ Transition Metal/Topological Insulator Interfaces

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