Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
63 (1988), S. 4099-4099
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The low steady field susceptibility measured as a function of increasing temperature in a field parallel to the plane of a thin (0.03-mm) disk of Au82.5Fe17.5 does not give any indication of magnetic "phase transitions'' or for the presence of an intermediate long-range ferromagnetic phase. These findings are in accord with the earlier observation that the temperature of the hyperfine splitting in the 57Fe Mössbauer spectrum is distinctly lower than that of the "critical susceptibility peak''; the latter clearly does not correspond to the onset of long-range ferromagnetism. If measured in a field of 9.6 Oe, the susceptibility has a well-defined maximum at ∼100 K, but in a field of 500 Oe the maximum shifts to ∼50 K. Showing isothermal remanence as well as magnetothermal history effects up to at least 130 K, the alloy is clearly spin-glass-like well above the temperature of the maximum. The magnetic viscosity increases gradually on cooling and "freezing'' takes place in a temperature range extending over 100 K. The susceptibility maximum is a kinematic effect; it does not signify a phase transition. The crossover from the paramagnetic state into the spin-glass state is a very gradual one in Au82.5Fe17.5.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340533
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