Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers

Abstract We report on magnetic damping of exchange coupled, polycrystalline Py(Ni80Fe20)|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...

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Autores principales:	Pavlo Omelchenko, Eric Arturo Montoya, Chris Coutts, Bret Heinrich, Erol Girt
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4088514575014e5299f62e9e546dd6c8
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spelling	oai:doaj.org-article:4088514575014e5299f62e9e546dd6c82021-12-02T15:06:10ZTunable magnetization and damping of sputter-deposited, exchange coupled Py\|Fe bilayers10.1038/s41598-017-05030-82045-2322https://doaj.org/article/4088514575014e5299f62e9e546dd6c82017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05030-8https://doaj.org/toc/2045-2322Abstract We report on magnetic damping of exchange coupled, polycrystalline Py(Ni80Fe20)\|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.Pavlo OmelchenkoEric Arturo MontoyaChris CouttsBret HeinrichErol GirtNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pavlo Omelchenko Eric Arturo Montoya Chris Coutts Bret Heinrich Erol Girt Tunable magnetization and damping of sputter-deposited, exchange coupled Py\|Fe bilayers
description	Abstract We report on magnetic damping of exchange coupled, polycrystalline Py(Ni80Fe20)\|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	article
author	Pavlo Omelchenko Eric Arturo Montoya Chris Coutts Bret Heinrich Erol Girt
author_facet	Pavlo Omelchenko Eric Arturo Montoya Chris Coutts Bret Heinrich Erol Girt
author_sort	Pavlo Omelchenko
title	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_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_sort	tunable magnetization and damping of sputter-deposited, exchange coupled py\|fe bilayers
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4088514575014e5299f62e9e546dd6c8
work_keys_str_mv	AT pavloomelchenko tunablemagnetizationanddampingofsputterdepositedexchangecoupledpyfebilayers AT ericarturomontoya tunablemagnetizationanddampingofsputterdepositedexchangecoupledpyfebilayers AT chriscoutts tunablemagnetizationanddampingofsputterdepositedexchangecoupledpyfebilayers AT bretheinrich tunablemagnetizationanddampingofsputterdepositedexchangecoupledpyfebilayers AT erolgirt tunablemagnetizationanddampingofsputterdepositedexchangecoupledpyfebilayers
_version_	1718388577318993920

Tunable magnetization and damping of sputter-deposited, exchange coupled Py|Fe bilayers

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