Spin pumping in magnetic trilayer structures with an MgO barrier

We present a study of the interaction mechanisms in magnetic trilayer structures with an MgO barrier grown by molecular beam epitaxy. The interlayer exchange coupling, Aex, is determined using SQUID magnetometry and ferromagnetic resonance (FMR), displaying an unexpected oscillatory behaviour as the...

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Main Authors:	Baker, A. A., Figueroa, A. I., Pingstone, D., Lazarov, V. K., van der Laan, G., Hesjedal, T.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5067716/

id	pubmed-5067716
recordtype	oai_dc
spelling	pubmed-50677162016-10-26 Spin pumping in magnetic trilayer structures with an MgO barrier Baker, A. A. Figueroa, A. I. Pingstone, D. Lazarov, V. K. van der Laan, G. Hesjedal, T. Article We present a study of the interaction mechanisms in magnetic trilayer structures with an MgO barrier grown by molecular beam epitaxy. The interlayer exchange coupling, Aex, is determined using SQUID magnetometry and ferromagnetic resonance (FMR), displaying an unexpected oscillatory behaviour as the thickness, tMgO, is increased from 1 to 4 nm. Transmission electron microscopy confirms the continuity and quality of the tunnelling barrier, eliminating the prospect of exchange arising from direct contact between the two ferromagnetic layers. The Gilbert damping is found to be almost independent of the MgO thickness, suggesting the suppression of spin pumping. The element-specific technique of x-ray detected FMR reveals a small dynamic exchange interaction, acting in concert with the static interaction to induce coupled precession across the multilayer stack. These results highlight the potential of spin pumping and spin transfer torque for device applications in magnetic tunnel junctions relying on commonly used MgO barriers. Nature Publishing Group 2016-10-18 /pmc/articles/PMC5067716/ /pubmed/27752117 http://dx.doi.org/10.1038/srep35582 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Baker, A. A. Figueroa, A. I. Pingstone, D. Lazarov, V. K. van der Laan, G. Hesjedal, T.
spellingShingle	Baker, A. A. Figueroa, A. I. Pingstone, D. Lazarov, V. K. van der Laan, G. Hesjedal, T. Spin pumping in magnetic trilayer structures with an MgO barrier
author_facet	Baker, A. A. Figueroa, A. I. Pingstone, D. Lazarov, V. K. van der Laan, G. Hesjedal, T.
author_sort	Baker, A. A.
title	Spin pumping in magnetic trilayer structures with an MgO barrier
title_short	Spin pumping in magnetic trilayer structures with an MgO barrier
title_full	Spin pumping in magnetic trilayer structures with an MgO barrier
title_fullStr	Spin pumping in magnetic trilayer structures with an MgO barrier
title_full_unstemmed	Spin pumping in magnetic trilayer structures with an MgO barrier
title_sort	spin pumping in magnetic trilayer structures with an mgo barrier
description	We present a study of the interaction mechanisms in magnetic trilayer structures with an MgO barrier grown by molecular beam epitaxy. The interlayer exchange coupling, Aex, is determined using SQUID magnetometry and ferromagnetic resonance (FMR), displaying an unexpected oscillatory behaviour as the thickness, tMgO, is increased from 1 to 4 nm. Transmission electron microscopy confirms the continuity and quality of the tunnelling barrier, eliminating the prospect of exchange arising from direct contact between the two ferromagnetic layers. The Gilbert damping is found to be almost independent of the MgO thickness, suggesting the suppression of spin pumping. The element-specific technique of x-ray detected FMR reveals a small dynamic exchange interaction, acting in concert with the static interaction to induce coupled precession across the multilayer stack. These results highlight the potential of spin pumping and spin transfer torque for device applications in magnetic tunnel junctions relying on commonly used MgO barriers.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5067716/
_version_	1613687346686853120

Spin pumping in magnetic trilayer structures with an MgO barrier

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