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

2020-02-08 20:53:16

conductance dependent ferromagnetic coherence fluctuations

责任者: Lee, S.;Trionfi, A.;Natelson, D. 单位: Dept. of Phys. & Astron., Rice Univ., Houston, TX, USA 来源出处: Physical Review B (Condensed Matter and Materials Physics)(Phys. Rev., B, Condens, Matter Mater. Phys. (USA)),2004/12/01,70(21):212407-1 摘要: 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 关键词: current fluctuations;ferromagnetic materials;iron alloys;magnetic domain walls;nanostructured materials;nickel alloys;quantum coherence;ferromagnetic metal;time-dependent conductance fluctuations;nanostructure;Cooperon contribution;domain wall motion;dephasing mechanism;Ni0.8Fe0.2