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Related Experiment Videos

Mixed magnetic phases in (Ga,Mn)As epilayers.

K Hamaya1, T Taniyama, Y Kitamoto

  • 1Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.

Physical Review Letters
|May 21, 2005
PubMed
Summary

Diluted magnetic semiconductor (Ga,Mn)As/GaAs(001) epilayers exhibit two distinct ferromagnetic-paramagnetic transitions. These transitions are linked to cluster phases and the main matrix, influencing magnetic anisotropy with temperature.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Semiconductor Spintronics

Background:

  • Diluted magnetic semiconductors (DMS) like (Ga,Mn)As are crucial for spintronic applications.
  • Understanding magnetic phase transitions and anisotropy in DMS is key to device performance.

Purpose of the Study:

  • To investigate the nature of ferromagnetic-paramagnetic transitions in (Ga,Mn)As/GaAs(001) epilayers.
  • To elucidate the relationship between magnetic anisotropy and temperature-dependent phase transitions.

Main Methods:

  • Ac susceptibility measurements were employed to detect magnetic transitions.
  • Analysis focused on identifying contributions from different phases within the (Ga,Mn)As epilayers.

Main Results:

Related Experiment Videos

  • Two distinct ferromagnetic-paramagnetic transitions were observed.
  • A higher-temperature transition was attributed to (Ga,Mn)As cluster phases with [110] uniaxial anisotropy.
  • A lower-temperature transition was associated with the ferromagnetic (Ga,Mn)As matrix exhibiting 100 cubic anisotropy.

Conclusions:

  • The observed transitions reveal complex magnetic ordering in (Ga,Mn)As/GaAs(001) epilayers.
  • A temperature-induced shift in magnetic easy axis from [100] to [110] is explained by the changing dominance of cubic anisotropy.