Quantum transport in ferromagnetic Permalloy nanostructures

Abstract

We studied phase coherent phenomena in mesoscopic Permalloy samples by exploring low temperature transport. Both, differential conductance as a function of bias voltage and magnetoconductance of individual wires display conductance fluctuations. Analysis of these fluctuations yields a phase coherence length of $\sim 250$ nm at 25 mK as well as a $1/\sqrt{T}$ temperature dependence. To suppress conductance fluctuations by ensemble averaging we investigated low temperature transport in wire arrays and extended Permalloy films. In these samples we have measured conductance corrections which stem from electron-electron interaction (EEI) but attempts to detect signatures of weak localization were without success.

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Cited by in corpus (4)

• All electrical measurement of the density of states in (Ga,Mn)As
• Resistivity Minimum in Granular Composites and Thin Metallic Films
• Spin-wave-induced correction to the conductivity of ferromagnets
• Dephasing in ferromagnetic nanowires: The role of spin waves