Order parameter dynamics in Mn${}_3$Sn driven by DC and pulsed spin-orbit torques

Abstract

We numerically investigate and develop analytic models for both the DC and pulsed spin-orbit-torque (SOT)-driven response of order parameter in single-domain Mn${}_3$Sn, which is a metallic antiferromagnet with an anti-chiral 120${}^{\circ }$ spin structure. We show that DC currents above a critical threshold can excite oscillatory dynamics of the order parameter in the gigahertz to terahertz frequency spectrum. Detailed models of the oscillation frequency versus input current are developed and found to be in excellent agreement with the numerical simulations of the dynamics. In the case of pulsed excitation, the magnetization can be switched from one stable state to any of the other five stable states in the Kagome plane by tuning the duration or the amplitude of the current pulse. Precise functional forms of the final switched state versus the input current are derived, offering crucial insights into the switching dynamics of Mn${}_3$Sn. The readout of the magnetic state can be carried out via either the anomalous Hall effect, or the recently demonstrated tunneling magnetoresistance in an all-Mn${}_3$Sn junction. We also discuss possible disturbance of the magnetic order due to heating that may occur if the sample is subject to large currents. Operating the device in pulsed mode or using low DC currents reduces the peak temperature rise in the sample due to Joule heating. Our predictive modeling and simulation results can be used by both theorists and experimentalists to explore the interplay of SOT and the order dynamics in Mn${}_3$Sn, and to further benchmark the device performance.

arXiv comment13 pages, 13 figures

References in corpus (28)

• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Electrical Manipulation of a Topological Antiferromagnetic State
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Antiferromagnetic spin Seebeck Effect
• Strong, anisotropic anomalous Hall effect and spin Hall effect in chiral antiferromagnetic compounds Mn${}_{3}X$ ($X$ = Ge, Sn, Ga, Ir, Rh and Pt)
• Spin-polarized current in non-collinear antiferromagnets
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Purely Antiferromagnetic Magnetoelectric Random Access Memory
• Electrical switching of antiferromagnetic Mn${}_2$Au and the role of thermal activation
• Anomalous Hall effect and topological defects in antiferromagnetic Weyl semimetals: Mn${}_3$Sn/Ge
• Conduction of spin currents through insulating oxides
• THz-Frequency Spin-Hall Auto-Oscillator Based on a Canted Antiferromagnet
• Tunneling Magnetoresistance in Noncollinear Antiferromagnetic Tunnel Junctions
• Magnetic Phase Dependence of the Anomalous Hall Effect in Mn${}_3$Sn Single Crystals
• Perspective on Metallic Antiferromagnets
• Quantum sensing and imaging of spin-orbit-torque-driven spin dynamics in noncollinear antiferromagnet Mn3Sn
• Micromagnetic modeling of Terahertz oscillations in an antiferromagnetic material driven by spin-Hall effect
• Dynamics of noncollinear antiferromagnetic textures driven by spin current injection
• Symmetry and the macroscopic dynamics of antiferromagnetic materials in the presence of spin-polarized current
• Narrow-band tunable THz detector in antiferromagnets via Néel spin-orbit torque and spin-transfer torque
• Time-dependent multistate switching of topological antiferromagnetic order in Mn${}_3$Sn
• Ultrafast antiferromagnetic switching in NiO induced by spin transfer torques
• Spin-Torque-driven Terahertz Auto Oscillations in Non-Collinear Coplanar Antiferromagnets
• Non-Collinear Spin Current for Switching of Chiral Magnetic Textures
• Precessional spin-torque dynamics in biaxial antiferromagnets
• The free energy of twisting spins in Mn${}_3$Sn
• Multiscale Modelling of the Antiferromagnet Mn2Au: From ab-initio to Micromagnetics

Cited by in corpus (1)

• Impact of strain on the SOT-driven dynamics of thin film Mn${}_3$Sn