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Noise Measurement of Interacting Ferromagnetic Particles with High Resolution Hall Microprobes

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arxiv 1001.1637 v1 pith:NXFUH32K submitted 2010-01-11 cond-mat.dis-nn

classification cond-mat.dis-nn
keywords hallmagneticmicroprobesnoiseagreecurrentdeterminationexperimental
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We present our first experimental determination of the magnetic noise of a superspinglass 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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