Tunable inertia of chiral magnetic domain walls

Abstract

The time it takes to accelerate an object from zero to a given velocity depends on the applied force and the environment. If the force ceases, it takes exactly the same time to completely decelerate. A magnetic domain wall (DW) is a topological object that has been observed to follow this behavior. Here we show that acceleration and deceleration times of chiral Neel walls driven by current are different in a system with low damping and moderate Dzyaloshinskii-Moriya (DM) exchange constant. The time needed to accelerate a DW with current via the spin Hall torque is much faster than the time it needs to decelerate once the current is turned off. The deceleration time is defined by the DM exchange constant whereas the acceleration time depends on the spin Hall torque, enabling tunable inertia of chiral DWs. Such unique feature of chiral DWs can be utilized to move and position DWs with lower current, key to the development of storage class memory devices.

References in corpus (11)

• New Perspectives for Rashba Spin-Orbit Coupling
• Theory of spin Hall magnetoresistance
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Spin Hall magnetoresistance in metallic bilayers
• The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry
• Interface enhancement of Gilbert damping from first-principles
• Correlation between the spin Hall angle and the structural phases of early 5d transition metals
• Interfacial Dzyaloshinskii-Moriya interaction in Ta\Co20Fe60B20\MgO nanowires
• Direct measurement of interfacial Dzyaloshinskii-Moriya interaction in X/CoFeB/MgO heterostructures with a scanning-NV magnetometer
• Direct Observation of Massless Domain Wall Dynamics in Nanostripes with Perpendicular Magnetic Anisotropy
• Current driven asymmetric magnetization switching in perpendicularly magnetized CoFeB/MgO heterostructures

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• Current-driven domain wall dynamics in ferrimagnets: micromagnetic approach and collective coordinates model
• Current-driven domain wall dynamics in ferromagnetic layers synthetically exchange-coupled by a spacer: A micromagnetic study
• High resolution dynamic imaging of the delay- and tilt-free motion of Néel domain walls in perpendicularly magnetized superlattices
• Electron Induced Massive Dynamics of Magnetic Domain Walls
• Voltage-Induced Inertial Domain Wall Motion in an Antiferromagnetic Nanowire
• Systematic motion of magnetic domain walls in notched nanowires under ultra-short current pulses
• Current-driven domain wall motion along ferromagnetic strips with periodically-modulated perpendicular anisotropy
• Spin orbit torque-driven motion of quasi-Bloch domain wall in perpendicularly magnetized W/CoFeB/MgO structure
• Domain Wall Motion in Magnetic Nanostrips
• Current-Driven Domain Wall Motion in Curved Ferrimagnetic Strips Above and Below the Angular Momentum Compensation
• Spin-orbit torque driven motion of chiral domain walls induced by radial magnetization in nanotube geometry
• High-mobility inertial domain walls driven by spin-transfer torque in a ferrimagnetic spinel oxide
• Geometrical design for pure current-driven domain wall nucleation and shifting
• Voltage Controlled Energy Efficient Domain Wall Synapses with Stochastic Distribution of Quantized Weights in the Presence of Thermal Noise and Edge Roughness