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Related Experiment Videos

Spin-dependent scattering in multilayered magnetic rings.

F J Castaño1, D Morecroft, W Jung

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary

Room-temperature giant magnetoresistance was observed in NiFe/Cu/Co elliptical rings, showing distinct resistance levels based on the magnetic states of the cobalt layer. These states, including bidomain and vortex, are influenced by magnetostatic interactions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Multilayered magnetic nanostructures are crucial for spintronic devices.
  • Understanding the relationship between micromagnetic states and magnetoresistance is key for device optimization.

Purpose of the Study:

  • To investigate the room-temperature giant magnetoresistance (GMR) effect in mesoscopic NiFe/Cu/Co elliptical rings.
  • To correlate distinct resistance levels with specific micromagnetic configurations of the Co layer.

Main Methods:

  • Fabrication of narrow mesoscopic NiFe/Cu/Co elliptical rings.
  • Experimental characterization of magnetoresistance at room temperature.
  • Micromagnetic simulations to analyze magnetic states and interactions.

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Main Results:

  • Observed distinct GMR with three resistance levels corresponding to Co layer bidomain (antiparallel/parallel to NiFe) and vortex states.
  • Micromagnetic simulations indicate magnetostatic interactions between domain walls in Co and NiFe layers dominate ring behavior.
  • Identified additional magnetization states in NiFe at low fields contributing to minor loop behavior.

Conclusions:

  • Mesoscopic NiFe/Cu/Co elliptical rings exhibit tunable GMR based on micromagnetic states.
  • Magnetostatic interactions play a significant role in the observed magnetic and magnetoresistance phenomena.
  • These findings offer insights for designing advanced magnetic memory and sensor devices.