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Spin anisotropy and slow dynamics in spin glasses
1Service de Physique de l'Etat Condensé, DSM, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France.
Physical Review Letters
|June 1, 2004
Summary
Spin anisotropy influences spin glass aging. Memory effect sharpness decreases with anisotropy, and coherence length growth is consistently described across Heisenberg and Ising spin glasses.
Area of Science:
- Condensed Matter Physics
- Magnetism and Magnetic Materials
Background:
- Spin glasses exhibit complex aging dynamics.
- Understanding the role of spin anisotropy is crucial for characterizing spin glass behavior.
Purpose of the Study:
- To investigate the influence of spin anisotropy on spin glass aging dynamics.
- To quantitatively compare the memory effect in Heisenberg and Ising spin glasses.
Main Methods:
- Performed temperature cycle experiments on four Heisenberg and one Ising spin glass samples.
- Conducted magnetic field change experiments to determine spin glass coherence length.
Main Results:
- The sharpness of the memory effect in spin glasses decreases with increasing spin anisotropy.
- Spin glass coherence length growth was quantified for the first time in an Ising sample.
- A single expression consistently described coherence length growth across different spin glass types.
Conclusions:
- Spin anisotropy is a key factor modulating spin glass aging.
- The findings provide a unified framework for understanding coherence length dynamics in various spin glasses.