title: Mesoscopic resistance fluctuations in cobalt nanoparticles.
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.
authors.affiliation: Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Y G
authors.initials: YG
authors.lastname: Wei
authors.forename: X Y
authors.initials: XY
authors.lastname: Liu
authors.forename: L Y
authors.initials: LY
authors.lastname: Zhang
authors.forename: D
authors.initials: D
authors.lastname: Davidović