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Current-driven switching in a single exchange-biased ferromagnetic layer.

T Y Chen1, Y Ji, C L Chien

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review Letters
|August 25, 2004
PubMed
Summary
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We observed spin-transfer torque effects in a single ferromagnetic layer. Current reversed magnetization hysteretically at low fields and reversibly at high fields, similar to multilayers.

Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Spin-transfer torque (STT) is crucial for magnetic memory devices.
  • Exchange bias is used to stabilize ferromagnetic layers.
  • Understanding STT in single layers is key for device miniaturization.

Purpose of the Study:

  • To demonstrate and characterize spin-transfer torque effects in a single exchange-biased ferromagnetic layer.
  • To investigate the field-dependent magnetization reversal mechanisms.

Main Methods:

  • Fabrication of a point contact on an exchange-biased Cobalt (Co) layer.
  • Application of electrical current and magnetic fields.
  • Measurement of magnetization reversal using magnetoresistance.

Related Experiment Videos

Main Results:

  • Demonstrated spin-transfer torque-induced magnetization reversal in a single Co layer.
  • Observed hysteretic reversal at low magnetic fields.
  • Observed reversible reversal at high magnetic fields (up to 9 T).

Conclusions:

  • Spin-transfer torque effects can be achieved in a single exchange-biased layer.
  • The observed effects are the inverse of domain wall magnetoresistance.
  • This finding offers potential for novel spintronic device architectures.