Noise Measurement of Interacting Ferromagnetic Particles with High Resolution Hall Microprobes
K. Komatsu, D. L'Hote, S. Nakamae, F. Ladieu, V. Mosser, A. Kerlain,, M. Konczykowski, E. Dubois, V. Dupuis, and R. Perzynski
TL;DR
This study measures magnetic noise in tiny frozen ferrofluid particles using high-resolution Hall microprobes, providing preliminary experimental data that aligns qualitatively with theoretical FDT violation predictions.
Contribution
First experimental measurement of magnetic noise in sub-picoliter frozen ferrofluid using advanced Hall microprobes with spinning current technique.
Findings
Qualitative agreement with FDT violation predictions
Demonstration of high-resolution magnetic noise measurement
Preliminary results encouraging further research
Abstract
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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