Physical Review Letters
Mesoscopic Resistance Fluctuations in Cobalt Nanoparticles
Physical Review Letters · 96, 146803 (2006)
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Introduction
Reproducible fluctuations in the resistance of cobalt nanoparticles form a fingerprint as the bias is swept. The fingerprint rearranges during magnetization reversal when magnetic domains appear or disappear.
A closer reading
What might look like noise serves as a probe of electronic phase. The authors interpret the rearrangement in terms of a spin lagging behind the changing local magnetic moment in a domain wall, an inference from transport rather than a direct image of the wall.