Noise Measurement of Interacting Ferromagnetic Particles with High Resolution Hall Microprobes

Komatsu, K.; L'Hôte, D.; Nakamae, S.; Ladieu, F.; Mosser, V.; Kerlain, A.; Konczykowski, M.; Dubois, E.; Dupuis, V.; Perzynski, R.
April 2009
AIP Conference Proceedings;4/23/2009, Vol. 1129 Issue 1, p153
Academic Journal
We present our first experimental determination of the magnetic noise of a superspin-glass made of <1 pico-liter frozen ferrofluid. The measurements were performed with a local magnetic field sensor based on Hall microprobes operated with the spinning current technique. The results obtained, though preliminary, qualitatively agree with the theoretical predictions of Fluctuation-Dissipation theorem (FDT) violation [1].


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