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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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Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor.

A J Ramsay1, P E Roy1, J A Haigh1

  • 1Hitachi Cambridge Laboratory, Hitachi Europe Limited, Cambridge CB3 0HE, United Kingdom.

Physical Review Letters
|February 28, 2015
PubMed
Summary

We show how lasers can precisely move domain walls in dilute magnetic semiconductors. This optical control offers new ways to manipulate magnetic materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Dilute magnetic semiconductors (DMS) are promising for spintronics.
  • Domain walls in magnetic materials are key for data storage.
  • Controlling domain wall motion is crucial for device applications.

Purpose of the Study:

  • To demonstrate optical manipulation of domain wall position in GaMnAsP.
  • To explore photocarrier spin-transfer torque and laser-induced attraction mechanisms.
  • To establish optical tweezerlike control over domain walls.

Main Methods:

  • Optical manipulation using focused laser.
  • Control of domain wall motion via laser helicity.
  • Investigation of spin-transfer torque and thermal effects.

Main Results:

  • Photocarrier spin exerts spin-transfer torque, driving domain wall motion.
  • Domain wall motion direction is controllable by laser helicity.
  • Domain walls are attracted to laser-generated hot spots.
  • Direct optical driving of domain walls, distinct from magnetic-field methods.

Conclusions:

  • Optical methods provide precise control over domain wall positioning in GaMnAsP.
  • This technique enables localized probing of domain walls.
  • Potential for advanced optical tweezer applications in magnetic nanostructures.