Anomalous spin-orbit torque switching in synthetic antiferromagnets

Bi, Chong; Almasi, Hamid; Price, K. C.; Newhouse-Illige, Ty; Xu, Meng; Allen, Shane R.; Fan, Xin; Wang, Weigang

doi:10.1103/physrevb.95.104434

Cited by 85 publications

(48 citation statements)

References 53 publications

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“…Bi et al observed this behavior Figure 6. Qualitative reproduction of the experimental results of Bi et al 22 The sign of the relative velocity of walls with (Q 1 , Q 2 ) = (+1, −1) and (Q 1 , Q 2 ) = (−1, +1) can be toggled only by changing the magnitude of the applied field. We use the material parameters supplied in the third column of Table I. in SAF structures for small in-plane fields, but by toggling between large and small values of the in-plane field (same sign), they were able to toggle the sign of the relative velocity of the walls and thereby the favored magnetization direction.…”

Section: B Novel Switching Behavior In Saf Structuressupporting

confidence: 61%

Universal absence of Walker breakdown and linear current-velocity relation via spin-orbit torques in coupled and single domain wall motion

Risinggård

Linder

2017

Phys. Rev. B

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We consider theoretically domain wall motion driven by spin-orbit and spin Hall torques. We find that it is possible to achieve universal absence of Walker breakdown for all spin-orbit torques using experimentally relevant spin-orbit coupling strengths. For spin-orbit torques other than the pure Rashba spin-orbit torque, this gives a linear current-velocity relation instead of a saturation of the velocity at high current densities. The effect is very robust and is found in both soft and hard magnetic materials, as well as in the presence of the Dzyaloshinskii-Moriya interaction and in coupled domain walls in synthetic antiferromagnets, where it leads to very high domain wall velocities. Moreover, recent experiments have demonstrated that the switching of a synthetic antiferromagnet does not obey the usual spin Hall angle-dependence, but that domain expansion and contraction can be selectively controlled toggling only the applied in-plane magnetic field magnitude and not its sign. We show for the first time that the combination of spin Hall torques and interlayer exchange coupling produces the necessary relative velocities for this switching to occur.

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Section: B Novel Switching Behavior In Saf Structuressupporting

confidence: 61%

Universal absence of Walker breakdown and linear current-velocity relation via spin-orbit torques in coupled and single domain wall motion

Risinggård

Linder

2017

Phys. Rev. B

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“…The dynamics of synthetic antiferromagnets is also relevant for switching by spin-orbit torques that has recently been demonstrated in devices containing synthetic antiferromagnetic layers. 19,20 .…”

Section: Statics and Dynamicsmentioning

confidence: 99%

Synthetic antiferromagnetic spintronics

et al. 2018

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Spintronic and nanomagnetic devices often derive their functionality from layers of different materials and the interfaces between them. This is especially true for synthetic antiferromagnets — two or more ferromagnetic layers that are separated by metallic spacers or tunnel barriers and which have antiparallel magnetizations. Here, we discuss the new opportunities that arise from synthetic antiferromagnets, as compared to crystal antiferromagnets or ferromagnets.

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“…Furthermore, the synthetic antiferromagnetic exchange coupling enhances the stability of the chiral Neel domain walls, thereby allowing much larger SOTs for the same current density, and therefore higher domain wall velocities. SOT‐induced magnetization switching of synthetic antiferromagnets was also reported …”

Section: Manipulation Of Magnetic Materials By Spin–orbit Torquesmentioning

confidence: 78%

Manipulation of Magnetization by Spin–Orbit Torque

Edmonds

Liu

et al. 2018

Adv Quantum Tech

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The control of magnetization by electric current is a rapidly developing area motivated by a strong synergy between breakthrough basic research discoveries and industrial applications in the fields of magnetic recording, magnetic field sensors, spintronics, and nonvolatile memories. In recent years, the discovery of spin–orbit torque has opened a spectrum of opportunities to manipulate the magnetization efficiently. This article presents a review of the historical background and recent literature focusing on spin–orbit torques (SOTs), highlighting the most exciting new scientific results and suggesting promising future research directions. It starts with an introduction and overview of the underlying physics of spin–orbit coupling effects in bulk and at interfaces, and then describes the use of SOTs to control ferromagnets and antiferromagnets. Finally, the prospects for the future development of spintronic devices based on SOTs are summarized.

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Anomalous spin-orbit torque switching in synthetic antiferromagnets

Cited by 85 publications

References 53 publications

Universal absence of Walker breakdown and linear current-velocity relation via spin-orbit torques in coupled and single domain wall motion

Universal absence of Walker breakdown and linear current-velocity relation via spin-orbit torques in coupled and single domain wall motion

Synthetic antiferromagnetic spintronics

Manipulation of Magnetization by Spin–Orbit Torque

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