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Signatures of the spin-triplet current in a Josephson spin valve: A micromagnetic analysis
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 2
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 1, 014511Article in journal (Refereed) Published
Abstract [en]

A Josephson spin valve is a ferromagnetic spin valve sandwiched between two superconducting electrodes. It has been predicted theoretically that such a device may exhibit a long-range proximity effect due to generation of unconventional odd-frequency spin-triplet and long-range spin-singlet components of the supercurrent. In this work we present a comprehensive numerical analysis of Josephson spin-valve characteristics. Our analysis is based on micromagnetic simulations for Ni-based spin valves. The supercurrent through the spin valve depends on shapes and sizes of components, the magnetic domain structure, and the flux quantization. For very small monodomain spin valves, the triplet current is manifested by a dissimilar double maximum in the magnetic field dependence of the critical current Ic (H). However, this feature is washed away in larger devices due to appearance of domains and flux quantization. The only remaining signature of the triplet current in this case are beatings in Ic (H) with a half-flux quantum periodicity. The complexity of the device can make it difficult to identify the spin-triplet supercurrent without a detailed knowledge of the spin-valve state. However, we argue that unambiguous conclusions can be made from a systematic analysis of size, thickness, and shape dependencies of the Josephson spin-valve characteristics.

Place, publisher, year, edition, pages
2017. Vol. 96, no 1, 014511
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-145899DOI: 10.1103/PhysRevB.96.014511ISI: 000405697400006OAI: oai:DiVA.org:su-145899DiVA: diva2:1134785
Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2017-11-29Bibliographically approved

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