Phys. Rev. B 70, 212407 (2004) [4 pages]Quantum coherence in a ferromagnetic metal: Time-dependent conductance fluctuationsReceived 31 March 2004; revised 13 July 2004; published 20 December 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.212407
DOI:
10.1103/PhysRevB.70.212407
PACS:
73.23.−b, 72.70.+m, 73.20.Fz, 73.50.−h
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