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A multi-state memory device based on the unidirectional spin Hall magnetoresistance

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Avci C. O., Mann M., Tan A. J., Gambardella P., Beach G. S. D.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Applied Physics Letters
Volume (Issue) 110(20)
Page(s) 203506 - 203506
ISBN 0003-6951
Title of proceedings Applied Physics Letters
DOI 10.1063/1.4983784

Open Access

URL https://aip.scitation.org/doi/10.1063/1.4983784
Type of Open Access Repository (Green Open Access)

Abstract

We report on a memory device concept based on the recently discovered unidirectional spin Hall magnetoresistance (USMR), which can store multiple bits of information in a single ferromagnetic heterostructure. We show that the USMR with possible contribution of Joule heating-driven magnetothermal effects in ferromagnet/normal metal/ferromagnet (FM/NM/FM) trilayers gives rise to four different 2nd harmonic resistance levels corresponding to four magnetization states (paired right arrows, reversible arrow, reversible arrow, paired left arrows) in which the system can be found. Combined with the possibility of controlling the individual FMs by spin-orbit torques, we propose that it is possible to build an all-electrical lateral two-terminal multi-bit-per-cell memory device. Published by AIP Publishing.
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