Quantum coherence in a ferromagnetic metal: time-dependent conductance fluctuations

Details Quantum coherence in a ferromagnetic metal: time-dependent conductance fluctuations Quantum coherence in a ferromagnetic metal: time-dependent conductance fluctuations

2004-08-10

arxiv.org/abs/cond-mat/0408221v2

Phys. Rev. B 70, 212407 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.212407

Quantum coherence of electrons in ferromagnetic metals is difficult to assess experimentally. We report the first measurements of time-dependent universal conductance fluctuations in ferromagnetic metal (Ni$_{0.8}$Fe$_{0.2}$) 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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