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Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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Force On A Current Loop In A Magnetic Field

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Updated: Jul 3, 2026

Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Perpendicular spin torques in magnetic tunnel junctions.

Z Li¹, S Zhang, Z Diao

¹Grandis Inc., 1123 Cadillac Court, Milpitas, California 95035, USA.

Physical Review Letters

|July 23, 2008

Summary

Researchers quantified perpendicular spin torque in magnetic tunnel junctions. Torque magnitude correlates with current density and bias voltage, reversing with polarity changes.

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Last Updated: Jul 3, 2026

Magnetic Tweezers for the Measurement of Twist and Torque

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Published on: March 24, 2019

Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Magnetic tunnel junctions (MTJs) are key components in spintronic devices.
Understanding spin torque is crucial for efficient magnetic switching.

Purpose of the Study:

To quantitatively determine the perpendicular spin torque in MTJs.
To investigate the relationship between torque, current density, bias voltage, and magnetic fields.

Main Methods:

Room-temperature critical switching current measurements.
Variable magnetic field and current pulse width experiments.
Formulation of bias dependence considering electron scattering.

Main Results:

Perpendicular spin torque magnitude is proportional to current density and bias voltage.
Torque direction reverses with voltage polarity.
Experimental results show qualitative agreement with the formulated bias dependence.

Conclusions:

The study provides a quantitative understanding of perpendicular spin torque in MTJs.
The findings contribute to the development of advanced spintronic devices.
Energy-dependent inelastic scattering is a key factor in spin torque behavior.