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

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${}_{0.8}$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.

5 pages, 4 figures

References in corpus (6)

• Resistivity due to a Domain Wall in Ferromagnetic Metal
• Weak localization in ferromagnets with spin-orbit interaction
• Domain walls and the conductivity of mesoscopic ferromagnets
• Magnetoresistance of single-domain ferromagnetic particles
• Universal conductance fluctuations and low temperature 1/f noise in mesoscopic AuFe spin glasses
• Electronic coherence in metals: comparing weak localization and time-dependent conductance fluctuations

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• Mesoscopic conductance effects in InMnAs structures
• Dephasing in ferromagnetic nanowires: The role of spin waves