Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 1986

Observation of 1/ƒ magnetic fluctuations in spin glasses

Résumé

We report the first observation of thermal magnetic fluctuations in a magnetic system at equilibrium. The fluctuations are detected by a SQUID magnetometer at 4.2 K on various insulating spin glasses: (Al2O3)0.1(MnO)0.5(SiO2)0.4, CdCr2xIn2(1-x)S4 and CsNiFeF6. The observed magnetic noise spectra behave like 1/f{hook} between 10-3 and 102 Hz. the amplitude of this 1/f{hook} noise agrees with that predicted by the fluctuation dissipation theorem. The effects of magnetic field and waiting time are systematically investigated.

Dates et versions

hal-04899933 , version 1 (20-01-2025)

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M. Ocio, H. Bouchiat, P. Monod. Observation of 1/ƒ magnetic fluctuations in spin glasses. Journal of Magnetism and Magnetic Materials, 1986, 54-57 (PART 1), pp.11-16. ⟨10.1016/0304-8853(86)90466-X⟩. ⟨hal-04899933⟩
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