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Related Experiment Videos

Current-driven magnetic excitations in permalloy-based multilayer nanopillars.

S Urazhdin1, Norman O Birge, W P Pratt

  • 1Department of Physics and Astronomy, Center for Fundamental Materials Research and Center for Sensor Materials, Michigan State University, East Lansing, Michigan 48824, USA.

Physical Review Letters
|November 13, 2003
PubMed
Summary

We investigated current-driven magnetization switching in nickel-iron/copper trilayers at different temperatures. Results reveal temperature-dependent switching behaviors and thermal activation effects influencing magnetic dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Current-driven magnetization switching is crucial for magnetic memory devices.
  • Understanding temperature effects on magnetic switching is essential for device reliability.

Purpose of the Study:

  • To investigate current-driven magnetization switching in NiFe/Cu/NiFe trilayers at 295 K and 4.2 K.
  • To analyze the temperature dependence of hysteretic switching diagrams and associated phenomena.

Main Methods:

  • Fabrication of Ni(84)Fe(16)/Cu/Ni(84)Fe16 trilayer structures.
  • Electrical transport measurements at 295 K and 4.2 K.
  • Analysis of hysteretic switching diagrams and differential resistance peaks.

Main Results:

Related Experiment Videos

  • The switching diagram shape at low magnetic fields varies with temperature.
  • A threshold current for magnetic excitations correlates with switching current.
  • Differential resistance exhibits telegraph noise, with period dependent on current and temperature.

Conclusions:

  • Both static and dynamic results are explained by thermal activation over a potential barrier.
  • A current-dependent effective magnetic temperature model describes the observed phenomena.
  • Temperature significantly influences magnetization switching dynamics in these trilayers.