Perspectives of antiferromagnetic spintronics

Jungfleisch, M. Benjamin; Zhang, Wei; Hoffmann, A.

doi:10.1016/j.physleta.2018.01.008

Cited by 256 publications

(157 citation statements)

References 65 publications

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“…All the SSE data taken at different magnetic fields up to 12 T near and above the critical point T N follow the critical scaling law very well with the critical exponents for magnetic susceptibility of 3D Ising systems, which suggests that the AFM spin correlation is responsible for the observed SSE near T N . 2 Antiferromagnetic insulators (AFMI) have recently attracted a great deal of interest in the emerging field of antiferromagnetic spintronics due to their unique properties such as robustness against magnetic field perturbation and ultrafast spin-dynamics [1][2][3][4]. In early reports, thin AFMI layers are found to enhance spin current transmission when they are inserted between a ferrimagnetic insulator (FMI) and a heavy metal (HM), such as the NiO and CoO AFMI layers in Y 3 Fe 5 O 12 (YIG)/NiO/Pt [5,6] and YIG/CoO/Pt [6], where an increased spin Seebeck effect (SSE) signal is attributed to the enhanced spin conductance in the AFMI spacer around its phase transition temperature [6,7].…”

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confidence: 99%

“…In order to clarify the physical origin of the SSE in AFMI, a uniaxial AFMI with an unusually high spinflop field is desired so that no equilibrium magnetization is induced with any laboratory accessible magnetic field. 3 Besides the FMI and AFMI, paramagnetic insulators (PMIs) have also been reported as a source of pure spin currents. SSE signals were observed in Gd 3 Ga 5 O 12 (GGG)/Pt [22], DyScO 3 (DSO)/Pt [22], and CoCr 2 O 4 (CCO)/Pt [23] over the temperature range where GGG, DSO, and CCO are PMIs.…”

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confidence: 99%

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Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF2 Films

Shi

Ortiz

et al. 2019

Phys. Rev. Lett.

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We report a longitudinal spin Seebeck effect (SSE) study in epitaxially grown FeF 2 (110) antiferromagnetic (AFM) thin films with strong uniaxial anisotropy over the temperature range of 3.8 -250 K. Both the magnetic field-and temperature-dependent SSE signals below the Néel temperature (T N =70 K) of the FeF 2 films are consistent with a theoretical model based on the excitations of AFM magnons without any net induced static magnetic moment. In addition to the characteristic low-temperature SSE peak associated with the AFM magnons, there is another SSE peak at T N which extends well into the paramagnetic phase. All the SSE data taken at different magnetic fields up to 12 T near and above the critical point T N follow the critical scaling law very well with the critical exponents for magnetic susceptibility of 3D Ising systems, which suggests that the AFM spin correlation is responsible for the observed SSE near T N .

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confidence: 99%

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confidence: 99%

Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF2 Films

Shi

Ortiz

et al. 2019

Phys. Rev. Lett.

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“…Despite a lack of clarity concerning the microscopic mechanisms of the Néel vector switching, these experiments have been widely regarded as a breakthrough in the emerging field of THz spintronics 26,30,36,[39][40][41][42][43] . It has been suggested that current-induced Néel vector dynamics in an AFM is driven primarily by the so-called Néel spin-orbit torques 29,32,[44][45][46][47][48][49][50][51][52][53][54][55][56] .…”

Section: Introductionmentioning

confidence: 99%

Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet

et al. 2020

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Giant Gilbert damping anisotropy is identified as a signature of strong Rashba spin-orbit coupling in a two-dimensional antiferromagnet on a honeycomb lattice. The phenomenon originates in spinorbit induced splitting of conduction electron subbands that strongly suppresses certain spin-flip processes. As a result, the spin-orbit interaction is shown to support an undamped non-equilibrium dynamical mode that corresponds to an ultrafast in-plane Néel vector precession and a constant perpendicular-to-the-plane magnetization. The phenomenon is illustrated on the basis of a two dimensional s-d like model. Spin-orbit torques and conductivity are also computed microscopically for this model. Unlike Gilbert damping these quantities are shown to reveal only a weak anisotropy that is limited to the semiconductor regime corresponding to the Fermi energy staying in a close vicinity of antiferromagnetic gap. arXiv:1911.03408v1 [cond-mat.str-el]

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“…One of the practical results was the development of magnetic memories with purely electronic write-in and readout processes as an alternative to existing solid state drive technologies 4,5 . An increasing demand for ever higher performance computation and ever faster big data analytics has sparked recently the interest to antiferromagnetic spintronics [6][7][8][9][10][11][12] , i. e. to the usage of much more subtle antiferromagnetic order parameter to store and process information. This idea is driven primarily by the expectation that antiferromagnetic materials may naturally allow for up to THz operation frequencies 11,13,14 in sharp contrast to ferromagnets whose current-induced magnetization dynamics is fundamentally limited to GHz frequency range.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit torques in a Rashba honeycomb antiferromagnet

et al. 2019

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Recent experiments on switching antiferromagnetic domains by electric current pulses have attracted a lot of attention to spin-orbit torques in antiferromagnets. In this work, we employ the tight-binding model solver, kwant, to compute spin-orbit torques in a two-dimensional antiferromagnet on a honeycomb lattice with strong spin-orbit interaction of Rashba type. Our model combines spin-orbit interaction, local s-d-like exchange, and scattering of conduction electrons on on-site disorder potential to provide a microscopic mechanism for angular momentum relaxation. We consider two versions of the model: one with preserved and one with broken sublattice symmetry. A nonequilibrium staggered polarization, that is responsible for the so-called Néel spin-orbit torque, is shown to vanish identically in the symmetric model but may become finite if sublattice symmetry is broken. Similarly, anti-damping spin-orbit torques vanish in the symmetric model but become finite and anisotropic in a model with broken sublattice symmetry. As expected, anti-damping torques also reveal a sizable dependence on impurity concentration. Our numerical analysis also confirms symmetry classification of spin-orbit torques and strong torque anisotropy due to in-plane confinement of electron momenta.

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Perspectives of antiferromagnetic spintronics

Cited by 256 publications

References 65 publications

Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF2 Films

Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF2 Films

Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet

Spin-orbit torques in a Rashba honeycomb antiferromagnet

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