Spin-transfer torques in antiferromagnetic textures: Efficiency and quantification method

Yamane, Yuta; Ieda, Jun’ichi; Sinova, Jairo

doi:10.1103/physrevb.94.054409

Cited by 38 publications

(32 citation statements)

References 36 publications

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“…Haney et al 90 have shown that an antiferromagnet can also generate a torque on a ferromagnet. Similarly to ferromagnets, a spin-transfer torque is also predicted to occur for an antiferromagnetic domain wall 84,91,92 . All of these investigations, however, considered ballistic transport in perfectly epitaxial and commensurate heterostructures.…”

Section: Box 1 -Antiferromagnetic Spin Valves and Tunneling Junctionsmentioning

confidence: 98%

Spin transport and spin torque in antiferromagnetic devices

et al. 2018

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Ferromagnets are key materials for sensing and memory applications. In contrast, antiferromagnets which represent the more common form of magnetically ordered materials, have found less practical application beyond their use for establishing reference magnetic orientations via exchange bias. This might change in the future due to the recent progress in materials research and discoveries of antiferromagnetic spintronic phenomena suitable for device applications. Experimental demonstration of the electrical switching and detection of the Néel order open a route towards memory devices based on antiferromagnets. Apart from the radiation and magnetic-field hardness, memory cells fabricated from antiferromagnets can be inherently multilevel, which could be used for neuromorphic computing. Switching speeds attainable in antiferromagnets far exceed those of ferromagnetic and semiconductor memory technologies. Here we review the recent progress in electronic spin-transport and spin-torque phenomena in antiferromagnets that are dominantly of the relativistic quantum mechanical origin. We discuss their utility in pure antiferromagnetic or hybrid ferromagnetic/antiferromagnetic memory devices.

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Section: Box 1 -Antiferromagnetic Spin Valves and Tunneling Junctionsmentioning

confidence: 98%

Spin transport and spin torque in antiferromagnetic devices

et al. 2018

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“…This conclusion may appear unsatisfactory given that there are a number of theoretical studies reporting the existence of a spin torque in continuous textures inside antiferromagnets 28 . Although the antiferromagnetic orders in the lead and the dynamical antiferromagnetic free-layer individually do not vary in space in our model, the difference in the orientation between the lead and dynamical antiferromagnetic moments can be considered as an extreme limit of spatial texture.…”

Section: (D20)mentioning

confidence: 99%

“…We note that thisẑ form is generic in the case where l denotes the crystalline momentum. 28 Specifically for a checker board structure, t l and l correspond to the Fourier transforms of the nearest-neighbor and next-nearest-neighbor hopping amplitudes respectively. 2∆ ex is the exchange split of the antiferromagnetic electrons.…”

Section: The Modelmentioning

confidence: 99%

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Spin transfer torques and spin-dependent transport in a metallic F/AF/N tunneling junction

et al. 2018

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We study spin-dependent electron transport through a ferromagnetic-antiferromagnetic-normal metal tunneling junction subject to a voltage or temperature bias, in the absence of spin-orbit coupling. We derive microscopic formulas for various types of spin torque acting on the antiferromagnet as well as for charge and spin currents flowing through the junction. The obtained results are applicable in the limit of slow magnetization dynamics. We identify a parameter regime in which an unconventional damping-like torque can become comparable in magnitude to the equivalent of the conventional Slonczewski's torque generalized to antiferromagnets. Moreover, we show that the antiferromagnetic sublattice structure opens up a channel of electron transport which does not have a ferromagnetic analogue and that this mechanism leads to a pronounced field-like torque. Both charge conductance and spin current transmission through the junction depend on the relative orientation of the ferromagnetic and the antiferromagnetic vectors (order parameters). The obtained formulas for charge and spin currents allow us to identify the microscopic mechanisms responsible for this angular dependence and to assess the efficiency of an antiferromagnetic metal acting as a spin current polarizer. J zF c J z d J zF c J z d ⇠ 0

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“…This is due to the spin conservation and the absence of momentum-dependent SOC field, which do not lead to the spin decoherence through the Dyakonov-Perel mechanism 30 during the scattering. The spin current may have interesting interactions with the local magnetic moments 31 , which is worth further study.…”

Section: Model and Candidate Materialsmentioning

confidence: 99%

Spin photogalvanic effect in two-dimensional collinear antiferromagnets

Xiao

Shao

et al. 2021

npj Quantum Mater.

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Recent discovered two-dimensional (2D) antiferromagnetic (AFM) van der Waals quantum materials have attracted increasing interest due to the emergent exotic physical phenomena. The spintronic properties utilizing the intrinsic AFM state in 2D antiferromagnets, however, have been rarely found. Here we show that the spin photogalvanic effect (SPGE), which has been predicted in three-dimensional (3D) antiferromagnets, can intrinsically emerge in 2D antiferromagnets for promising spintronic applications. Based on the symmetry analysis of possible AFM orders in the honeycomb lattice, we conclude suitable 2D AFM candidate materials for realizing the SPGE. We choose two experimentally synthesized 2D collinear AFM materials, monolayer MnPS3, and bilayer CrCl3, as representative materials to perform first-principles calculations, and find that they support sizable SPGE. The SPGE in collinear 2D AFM materials can be utilized to generate pure spin current in a contactless and ultra-fast way.

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Spin-transfer torques in antiferromagnetic textures: Efficiency and quantification method

Cited by 38 publications

References 36 publications

Spin transport and spin torque in antiferromagnetic devices

Spin transport and spin torque in antiferromagnetic devices

Spin transfer torques and spin-dependent transport in a metallic F/AF/N tunneling junction

Spin photogalvanic effect in two-dimensional collinear antiferromagnets

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