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Related Experiment Video

Updated: May 31, 2026

Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Current-induced spin-orbit torques.

Pietro Gambardella¹, Ioan Mihai Miron

¹Institut Catalá de Nanotecnologia, Centre d'Investigaciò en Nanociència i Nanotecnologia (ICN-CIN2), UAB Campus, 08193 Barcelona, Spain. pietro.gambardella@icrea.es

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|July 6, 2011

Summary

This summary is machine-generated.

A new spin-orbit (SO) torque mechanism in ferromagnetic materials is reviewed. This current-induced effect transfers angular momentum from the lattice to the spin system, offering new ways to control nanomagnets.

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Area of Science:

Condensed matter physics
Materials science
Spintronics

Background:

The spin-transfer torque mechanism, predicted in 1996, enables current-induced magnetization reversal in nanomagnets.
This has driven significant research into novel methods for controlling magnetic properties.

Purpose of the Study:

To review the theoretical and experimental evidence for a novel current-induced spin torque mechanism.
To introduce and explain the spin-orbit (SO) torque in ferromagnetic materials.

Main Methods:

Review of existing theoretical frameworks and experimental findings.
Analysis of the role of crystalline structure lacking inversion symmetry.
Examination of the interplay between spin-orbit coupling and exchange coupling.

Main Results:

The spin-orbit (SO) torque is a prominent effect in both ferromagnetic metals and semiconductors.
SO torque arises from the transfer of orbital angular momentum from the lattice to the spin system.
The orientation and magnitude of SO torques can be tuned through material engineering.

Conclusions:

Spin-orbit torque presents a promising avenue for advanced spintronic devices.
Further research can explore material-specific properties and device applications.
This mechanism offers flexibility in controlling nanomagnet magnetization.