Ferromagnetic Josephson junctions for cryogenic memory

Norman O. Birge; Alexander E. Madden; Ofer Naaman

doi:10.1117/12.2321109

20 September 2018 Ferromagnetic Josephson junctions for cryogenic memory

Norman O. Birge, Alexander E. Madden, Ofer Naaman

Proceedings Volume 10732, Spintronics XI; 107321M (2018) https://doi.org/10.1117/12.2321109
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Josephson junctions containing ferromagnetic materials have attracted intense interest both because of their unusual physical properties and because they have potential application for cryogenic memory. There are two ways to store information in such a junction: either in the amplitude of the critical current or in the ground-state phase difference across the junction; the latter is the topic of this paper. We have recently demonstrated two different ways to achieve phase control in such junctions: the first uses junctions containing two magnetic layers in a pseudo spin valve configuration, while the second uses junctions containing three magnetic layers with non-collinear magnetizations. The demonstration devices, however, have not yet been optimized for use in a large-scale cryogenic memory array. In this paper we outline some of the issues that must be considered to perform such an optimization, and we provide a speculative phase-diagram for the nickel-permalloy spin-valve system showing which combinations of ferromagnetic layer thicknesses should produce useful devices.

Conference Presentation

Citation Download Citation

Norman O. Birge, Alexander E. Madden, and Ofer Naaman "Ferromagnetic Josephson junctions for cryogenic memory", Proc. SPIE 10732, Spintronics XI, 107321M (20 September 2018); https://doi.org/10.1117/12.2321109

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