Temple, R., Rosamond, M. C., Massey, J. R., Almeida, T. P. , Linfield, E. H., McGrouther, D. , McVitie, S. , Moore, T. A. and Marrows, C. H. (2021) Phase domain boundary motion and memristance in gradient-doped FeRh nanopillars induced by spin injection. Applied Physics Letters, 118, 122403. (doi: 10.1063/5.0038950)
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Abstract
The B2-ordered alloy FeRh shows a metamagnetic phase transition, transforming from antiferromagnetic (AF) to ferromagnetic (FM) order at a temperature Tt∼380 K in bulk. As well as temperature, the phase transition can be triggered by many stimuli such as strain, chemical doping, or magnetic or electric fields. Its first-order nature means that phase coexistence is possible. Here we show that a phase boundary in a 300 nm diameter nanopillar, controlled by a doping gradient during film growth, is moved by an electrical current in the direction of electron flow. We attribute this to spin injection from one magnetically ordered phase region into the other driving the phase transition in a region just next to the phase boundary. The associated change in resistance of the nanopillar shows memristive properties, suggesting potential applications as memory cells or artificial synapses in neuromorphic computing schemes.
| Item Type: | Articles |
|---|---|
| Additional Information: | This work was supported by EPSRC Grant Nos. EP/M018504/ 1 and EP/M019020/1 and by the Diamond Light Source. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | McVitie, Professor Stephen and McGrouther, Dr Damien and Almeida, Dr Trevor |
| Authors: | Temple, R., Rosamond, M. C., Massey, J. R., Almeida, T. P., Linfield, E. H., McGrouther, D., McVitie, S., Moore, T. A., and Marrows, C. H. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Applied Physics Letters |
| Publisher: | American Institute of Physics |
| ISSN: | 0003-6951 |
| ISSN (Online): | 1077-3118 |
| Published Online: | 22 March 2021 |
| Copyright Holders: | Copyright © 2021 Author(s) |
| First Published: | First published in Applied Physics Letters 118:122403 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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