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

2004/08/10 by S. Lee, A. Trionfi, D. Natelson
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.70.212407

published as Phys. Rev. B 70, 212407 (2004) · 5 pages, 4 figures

arxiv created 2004/08/10 · arxiv updated 2009/12/01

Abstract

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_0.8Fe_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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