Experimental demonstration of a Josephson magnetic memory cell with a programmable \pi-junction
Abstract
We experimentally demonstrate the operation of a Josephson magnetic random access memory unit cell, built with a Ni_80Fe_20/Cu/Ni pseudo spin-valve Josephson junction with Nb electrodes and an integrated readout SQUID in a fully planarized Nb fabrication process. We show that the parallel and anti-parallel memory states of the spin-valve can be mapped onto a junction equilibrium phase of either zero or pi by appropriate choice of the ferromagnet thicknesses, and that the magnetic Josephson junction can be written to either a zero-junction or pi-junction state by application of write fields of approximately 5 mT. This work represents a first step towards a scalable, dense, and power-efficient cryogenic memory for superconducting high-performance digital computing.
- Publication:
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arXiv e-prints
- Pub Date:
- November 2017
- DOI:
- 10.48550/arXiv.1711.01681
- arXiv:
- arXiv:1711.01681
- Bibcode:
- 2017arXiv171101681D
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 5 figures, accepted by IEEE Magnetics Letters