Observation of the dominant spin-triplet supercurrent in Josephson spin valves with strong Ni ferromagnets

O. M. Kapran; A. Iovan; T. Golod; V. M. Krasnov

doi:10.1103/PhysRevResearch.2.013167

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Observation of the dominant spin-triplet supercurrent in Josephson spin valves with strong Ni ferromagnets

O. M. Kapran, A. Iovan, T. Golod, V. M. Krasnov

DOI 10.1103/PhysRevResearch.2.013167 · Physical Review Research

T1

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Abstract

We study experimentally nanoscale Josephson junctions and Josephson spin valves containing strongly ferromagnetic Ni interlayers. We observe that in contrast to junctions, spin valves with the same geometry exhibit anomalous Ic(H) patterns with two peaks separated by a dip. We develop several techniques for in situ characterization of micromagnetic states in our nanodevices, including magnetoresistance, absolute Josephson fluxometry, and first-order-reversal-curves analysis. They reveal a clear correlation of the dip in supercurrent with the antiparallel state of a spin valve and the peaks with two noncollinear magnetic states, thus providing evidence for generation of spin-triplet superconductivity. A quantitative analysis, based on micromagnetic simulations, brings us to the conclusion that the triplet current in our Ni-based spin valves is approximately three times larger than the conventional spin-singlet supercurrent.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown