Noise Measurement of Interacting Ferromagnetic Particles with High Resolution Hall Microprobes
arXiv:1001.1637 · doi:10.1063/1.3140418
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].
4pages, 2 figures