Diao, Z., Nowak, E.R., Feng, G., Coey, J.M.D., Magnetic noise in structured hard magnets , Physical Review Letters, 104, 4, 2010, art. no. 047202
Physical Review Letters; 104; 4;
The anomalous Hall effect of wires patterned from ðCo90Fe10=PtÞn multilayers, with 10 n 50, is
used to determine the magnetization process in a small volume of maze domains. Time-independent 1=f
noise appears in samples with a quality factor Q<1 at points on the hysteresis loop where the
magnetization reverses continuously. The magnetic noise is associated with reversible excursions of
segments of a domain wall 100 nm long. Barkhausen jumps are observed close to either the switching
field or the saturation field where the noise power spectrum varies as 1=f1:7, and its magnitude decays with
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