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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

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Published on: February 27, 2021

Thermal gradient driven domain wall dynamics.

M T Islam^1,2, X S Wang^3,4, X R Wang^1,5

¹Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 8, 2019

Summary

This summary is machine-generated.

Thermal gradients drive domain wall motion via angular momentum transfer, not energy dissipation. This spin current mechanism explains domain wall speed and rotation, distinct from magnetic field or electric current effects.

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Area of Science:

Spintronics
Condensed Matter Physics

Background:

Domain wall (DW) dynamics are crucial for magnetic memory devices.
DW motion is driven by energy or angular momentum transfer.
Thermal gradients offer a novel approach to DW control.

Purpose of the Study:

Investigate if thermal gradients act like magnetic fields or electric currents in DW dynamics.
Clarify the mechanism of DW propagation driven by thermal gradients.
Characterize the spin-transfer torque (STT) generated by thermal gradients.

Main Methods:

Analyzing DW propagation speed under thermal gradients.
Measuring DW-plane rotation speed.
Investigating the effect of Gilbert damping and uniaxial anisotropy.

Main Results:

DW propagation driven by thermal gradients is explained by angular momentum transfer from thermally generated spin current.
DW-plane rotation speed increases with decreasing DW width.
Both DW propagation and rotation speeds decrease with increasing Gilbert damping.

Conclusions:

Thermal gradient-driven DW motion is an angular momentum transfer process.
Magnonic STT generated by thermal gradients has damping-like and field-like components.
The non-adiabatic STT coefficient depends on DW width and damping, not thermal gradient.