Quantum transport in ferromagnetic permalloy nanostructures
نویسندگان
چکیده
We studied phase-coherent phenomena in mesoscopic permalloy Ni81Fe19 samples by exploring lowtemperature 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 250 nm at 25 mK as well as a 1 / 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; but attempts to detect signatures of weak localization were without success.
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