Quantum coherence of electrons in ferromagnetic metals is difficult to assess experimentally. We report measurements of time-dependent universal conductance fluctuations in ferromagnetic metal (Ni0.8Fe0.2) nanostructures as a function of temperature and magnetic field strength and orientation. We find that the Cooperon contribution to this quantum correction is suppressed, and that domain wall motion can be a source of coherence-enhanced conductance fluctuations. The fluctuations are more strongly temperature dependent than those in normal metals, hinting that an unusual dephasing mechanism may be at work.
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Lee et al. (2004) studied this question.
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