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arXiv · 1702.02765

Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer

Carla Cirillo·Stefano Voltan·Katsiaryna Ilyina·Joan Manel Hernandez·Antoni Garcia-Santiago·Jan Aarts·Carmine Attanasio
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Abstract

Odd-frequency triplet Cooper pairs are believed to be the carriers of long-range superconducting correlations in ferromagnets. Such triplet pairs are generated by inhomogeneous magnetism at the interface between a superconductor (S) and a ferromagnet (F). So far, reproducible long-range effects were reported only in complex layered structures designed to provide the magnetic inhomogeneity. Here we show that spin triplet pair formation can be found in simple unstructured Nb/Permalloy (Py = Ni_0.8Fe_0.2)/Nb trilayers and Nb/Py bilayers, but only when the thickness of the ferromagnetic layer ranges between 140 and 250 nm. The effect is related to the emergence of an intrinsically inhomogeneous magnetic state, which is a precursor of the well-known stripe regime in Py that in our samples sets in at thickness larger than 300 nm.

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Carla Cirillo, Stefano Voltan, Katsiaryna Ilyina, Joan Manel Hernandez, Antoni Garcia-Santiago, Jan Aarts, Carmine Attanasio. 2017-02-09. Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer. https://doi.org/10.1088/1367-2630/aa5de8

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