Chiral spin torque arising from proximity-induced magnetization

Ryu, Kwang-Su; Yang, See‐Hun; Thomas, Luc; Parkin, Stuart S. P.

doi:10.1038/ncomms4910

Cited by 237 publications

(201 citation statements)

References 37 publications

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“…To maximize the spin-Hall signal, the thickness of the NM exceeds in most experiments the spin diffusion length, λ sf , of the NM. However, when a thin NM (thickness below λ sf ) is placed in contact with a FM, interface effects, such as spin-memory loss [13,19] and magnetic proximity effects [20][21][22][23][24], can become pronounced and alter the spin-transport properties of the sample. Among the materials studied for large spin-Hall effects, Pt and Pd are two of the most popular metals employed, especially Pt, which has been indispensable in the establishment of virtually all the newly discovered pure spin-current phenomena [4,5,[9][10][11][12][13]16].…”

Section: Introductionmentioning

confidence: 99%

Reduced spin-Hall effects from magnetic proximity

et al. 2015

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Harnessing spin-orbit coupling for the manipulation of spins and magnetization via electric charge currents is the key objective of spin-orbitronics. Towards this end ferromagnetic materials are combined with nonmagnetic materials with strong spin-orbit coupling (typically involving heavy elements). However, many of the nominally nonmagnetic materials are highly susceptible to magnetic proximity effects, and the role of induced moments for spin transport has been controversial. Here we demonstrate that for Pt and Pd increased induced magnetic moments are correlated with strongly reduced spin-Hall conductivities. This observation finds an intuitive explanation in the development of a spin splitting of the chemical potential and the energy dependence of the intrinsic spin-Hall effect determined by first-principles calculations. This work provides simple guidance towards the optimization of spin current efficiencies for devices based on spin-orbit coupling phenomena.

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Section: Introductionmentioning

confidence: 99%

Reduced spin-Hall effects from magnetic proximity

et al. 2015

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“…For instance, it has been found that different choices of 5d heavy metal layers can significantly influence the sign and strength of the DMI. 3,16,[18][19][20][21] In addition, the DMI can be tailored by adjusting the ratio of film thicknesses of top and bottom nonmagnetic layers in sandwich structures. 2,22,23 However, experimental measurements of the influence of 3d elements on the DMI remain rare.…”

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confidence: 99%

Ternary superlattice boosting interface-stabilized magnetic chirality

Chen

N’Diaye

et al. 2015

Applied Physics Letters

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In cobalt-nickel multilayers grown on iridium surfaces, magnetic homo-chirality can be stabilized by Dzyaloshinskii-Moriya interactions (DMI) at the interface with the substrate. When thickness of the multilayers is increased beyond threshold values, then non-chiral bulk properties exceed interface contributions and this type of chirality vanishes. Here, we use spin-polarized low energy electron microscopy to measure these thickness thresholds, and we determine estimates of the strength of the DMI from the measurements. Even though the same 5d heavy metal is used as a substrate, a remarkably large variation is found between the two 3d magnets: our results indicate that the strength of the DMI at Co/Ir interfaces is three times larger than at Ni/Ir interfaces. We show how this finding provides ways to extend interfacial-DMI stabilization of domain wall chirality to 3d/5d/3d ternary multilayers such as [Ni/Ir/Co]n. Such strategies may extend chirality-control to larger film thickness and a wider range of substrates, which may be useful for designing new spintronics devices.

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“…Second, it is also responsible for the emergence of interfacial DzyaloshinskiiMoriya interaction (DMI), which promotes chiral magnetic textures. The concurrence of antidamping SOT and DMIinduced chiral textures results in fast DW motion in ultrathin layer structures [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of spin Hall effect induced torques for current-driven magnetic domain wall motion: Inner interface effect

Bang

Qiu

et al. 2016

Phys. Rev. B

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We investigate the current-induced domain wall motion in perpendicular magnetized Tb/Co wires with structure inversion asymmetry and different layered structures. We find that the critical current density to drive domain wall motion strongly depends on the layered structure. The lowest critical current density ∼15 MA/cm 2 and the highest slope of domain wall velocity curve are obtained for the wire having thin Co sublayers and more inner Tb/Co interfaces, while the largest critical current density ∼26 MA/cm 2 required to drive domain walls is observed in the Tb-Co alloy magnetic wire. It is found that the Co/Tb interface contributes negligibly to Dzyaloshinskii-Moriya interaction, while the effective spin-orbit torque strongly depends on the number of Tb/Co inner interfaces (n). An enhancement of the antidamping torques by extrinsic spin Hall effect due to Tb rare-earth impurity-induced skew scattering is suggested to explain the high efficiency of current-induced domain wall motion.

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Chiral spin torque arising from proximity-induced magnetization

Cited by 237 publications

References 37 publications

Reduced spin-Hall effects from magnetic proximity

Reduced spin-Hall effects from magnetic proximity

Ternary superlattice boosting interface-stabilized magnetic chirality

Enhancement of spin Hall effect induced torques for current-driven magnetic domain wall motion: Inner interface effect

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