Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer
arXiv:1702.02765 · doi:10.1088/1367-2630/aa5de8
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.
accepted for publication on New Journal of Physics, available online http://iopscience.iop.org/article/10.1088/1367-2630/aa5de8
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Cited by in corpus (6)
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- Effect of Meissner screening and trapped magnetic flux on magnetization dynamics in thick Nb/Ni80Fe20/Nb trilayers
- Disorder-robust -wave pairing with odd frequency dependence in normal metal-conventional superconductor junctions
- Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy
- Evidence of the inverse proximity effect in tunnel magnetic Josephson Junctions
- Unconventional domain wall magnetoresistance of patterned Ni/Nb bilayer structures below superconducting transition temperature of Nb