ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report on the magnetization noise and the imaginary susceptibility for the random anisotropy amorphous alloy DyNi1.32 for frequencies f〈10 Hz, temperatures 1.2〈T〈4.2 K, and excitation field amplitudes 〈150 μA/m (1.9 μOe). The noise spectra agree, without any adjustable parameter, with the fluctuation dissipation formula and the measured imaginary susceptibility of the material. The spectra show a 1/f shape coming from a frequency-independent imaginary susceptibility that it is found to be temperature-dependent extrapolating to zero at zero temperature. We discuss the connection between this approach and the usual relaxation experiments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.355617