| Autor: |
Kiminari Shinagawa, Tachiro Tsushima, Y. Matsumaru, Toshiaki Saito |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. 130:347-352 |
| ISSN: |
0304-8853 |
| Popis: |
We have investigated critical lines in the H-T plane in a random anisotropy magnet (RAM) a-Dy 16 Fe 84 with a small effective ratio of the anisotropy ( D ) to the exchange constant ( J ) by means of ac susceptibility (χ) in static fields H parallel and perpendicular to the ac field. We found that the transverse χ exhibits an anomaly along the irreversible line H ( T f ) determined by previous magnetization measurements, while the longitudinal χ does so along a characteristic line H ( T i ) in a lower temperature region. Above H ( T f ) we also found an extra characteristic line H ( T c ). The lines were almost independent of the measured frequency. Both the present results and previous magnetization results suggest that an equilibrium phase transition occurs, and the critical lines analogous to those in Heisenberg spin glasses are present in a weak RAM. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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