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Mesoscopic resistance fluctuations in cobalt nanoparticles.

Authors
  • Wei, Y G
  • Liu, X Y
  • Zhang, L Y
  • Davidović, D
Type
Published Article
Journal
Physical review letters
Publication Date
Apr 14, 2006
Volume
96
Issue
14
Pages
146803–146803
Identifiers
PMID: 16712108
Source
Medline
License
Unknown

Abstract

We present measurements of mesoscopic resistance fluctuations in cobalt nanoparticles and study how the fluctuations with bias voltage, bias fingerprints, respond to magnetization-reversal processes. Bias fingerprints rearrange when domains are nucleated or annihilated. The domain wall causes an electron wave function-phase shift of approximately equal to 5pi. The phase shift is not caused by the Aharonov-Bohm effect; we explain how it arises from the mistracking effect, where electron spins lag in orientation with respect to the moments inside the domain wall. Dephasing time in Co at 0.03 K is short, tau phi approximately 1 ps, which we attribute to the strong magnetocrystalline anisotropy.

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