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Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers
We report on magnetic damping of exchange coupled, polycrystalline Py(Ni(80)Fe(20))|Fe and Fe|Py bilayers, prepared by sputter-deposition on an amorphous 3 nm Ta seed layer. FMR measurements are performed on varying thicknesses of the individual Py and Fe layers while keeping the total bilayer struc...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5501870/ https://www.ncbi.nlm.nih.gov/pubmed/28687777 http://dx.doi.org/10.1038/s41598-017-05030-8 |
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author | Omelchenko, Pavlo Montoya, Eric Arturo Coutts, Chris Heinrich, Bret Girt, Erol |
author_facet | Omelchenko, Pavlo Montoya, Eric Arturo Coutts, Chris Heinrich, Bret Girt, Erol |
author_sort | Omelchenko, Pavlo |
collection | PubMed |
description | We report on magnetic damping of exchange coupled, polycrystalline Py(Ni(80)Fe(20))|Fe and Fe|Py bilayers, prepared by sputter-deposition on an amorphous 3 nm Ta seed layer. FMR measurements are performed on varying thicknesses of the individual Py and Fe layers while keeping the total bilayer structure thickness fixed. When Fe is grown directly on Ta, there is large magnetic inhomogeneity and damping. However, when a Py layer is deposited between Fe and Ta, both the magnetic inhomogeneity and damping significantly decrease even if Fe is covered by Ta. The intrinsic damping of the Ta|Py|Fe film can be further lowered by increasing the Fe to Py ratio. SQUID measurements show a linear increase in saturation magnetization with increasing ratio of Fe to Py. A combination of in-plane and out-of-plane X-ray diffraction measurements show that Py is textured along the 〈111〉 directions and Fe is textured along the 〈110〉, with Fe texture significantly improving if it is deposited on Ta|Py instead of Ta. By improving the texture of Fe by introducing a thin Py layer between Fe and Ta, one can grow Fe thin films with zero in-plane anisotropy, tunable magnetic moment, and low magnetic damping, approaching that of the best single crystal Fe. |
format | Online Article Text |
id | pubmed-5501870 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55018702017-07-10 Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers Omelchenko, Pavlo Montoya, Eric Arturo Coutts, Chris Heinrich, Bret Girt, Erol Sci Rep Article We report on magnetic damping of exchange coupled, polycrystalline Py(Ni(80)Fe(20))|Fe and Fe|Py bilayers, prepared by sputter-deposition on an amorphous 3 nm Ta seed layer. FMR measurements are performed on varying thicknesses of the individual Py and Fe layers while keeping the total bilayer structure thickness fixed. When Fe is grown directly on Ta, there is large magnetic inhomogeneity and damping. However, when a Py layer is deposited between Fe and Ta, both the magnetic inhomogeneity and damping significantly decrease even if Fe is covered by Ta. The intrinsic damping of the Ta|Py|Fe film can be further lowered by increasing the Fe to Py ratio. SQUID measurements show a linear increase in saturation magnetization with increasing ratio of Fe to Py. A combination of in-plane and out-of-plane X-ray diffraction measurements show that Py is textured along the 〈111〉 directions and Fe is textured along the 〈110〉, with Fe texture significantly improving if it is deposited on Ta|Py instead of Ta. By improving the texture of Fe by introducing a thin Py layer between Fe and Ta, one can grow Fe thin films with zero in-plane anisotropy, tunable magnetic moment, and low magnetic damping, approaching that of the best single crystal Fe. Nature Publishing Group UK 2017-07-07 /pmc/articles/PMC5501870/ /pubmed/28687777 http://dx.doi.org/10.1038/s41598-017-05030-8 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Omelchenko, Pavlo Montoya, Eric Arturo Coutts, Chris Heinrich, Bret Girt, Erol Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers |
title | Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers |
title_full | Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers |
title_fullStr | Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers |
title_full_unstemmed | Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers |
title_short | Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers |
title_sort | tunable magnetization and damping of sputter-deposited, exchange coupled py|fe bilayers |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5501870/ https://www.ncbi.nlm.nih.gov/pubmed/28687777 http://dx.doi.org/10.1038/s41598-017-05030-8 |
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