Magnetization reversal in single ferromagnetic Ni and Co particles
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Presented are magnetization measurements of single submicronic particles (500–50 nm) at very low temperature (0.1–6 K). We are studying the mean switching field and the switching probability as a function of the field sweeping rate and temperature. For temperatures down to 1 K we observe an increase of the mean switching field. Below, the mean switching field becomes temperature independent. The results are compared with models of thermally activated switching and macroscopic quantum tunneling.