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Journal of Radio Electronics Online scientific journal · eISSN 1684-1719
2025, № 11 · PHYSICAL PROBLEMS OF ELECTRONICS

Magneto-optical Faraday effect in nanoscale structures based on BiY2Fe5O12 obtained by magnetron sputtering

M.S. Artemyev1, Y.P. Sukhorukov1, A.V. Telegin1, S.V. Naumov1, S.S. Dubinin1, A.P. Nosov1,2

1 M.N. Mikheev Institute of Metal Physics Ural Branch of the RAS, Ekaterinburg, Russia
2 M.V. Lomonosov Moscow State University, Moscow, Russia
Full text DOI: 10.30898/1684-1719.2025.11.10 UDC 537.632.4 EDN JUECDS

Abstract

In this study, we investigated the features of Faraday rotation of light in the visible region of the spectrum in thin-film structures based on BiY2Fe5O12 with a thickness ranging from 5 to 55 nm. Bi-doped yttrium-iron- garnet films obtained by magnetron sputtering on single-crystal substrates of yttrium-aluminum (Y3Al5O12) and gadolinium-gallium garnet (Gd3Ga5O12) demonstrate magneto-optical quality comparable to that of bulk BiY2Fe5O12 samples. It was established that for the studied nanostructures, the contribution of the substrates to the spectral and field dependences of the Faraday effect is decisive. The determination of the magneto-optical parameters and the Verde constant of the substrates allowed us to identify the contribution of the substrate and study the features of the Faraday effect for magnetic films with a thickness less than or equal to the thickness of the relaxation layer at the film/substrate interface. It is noted that in BiY2Fe5O12 films with a thickness less than the thickness of the magnetically dead layer (about 5 nm), the Faraday effect is absent. At the same time, in films with a thickness greater than 25 nm, the specific Faraday rotation is about 25 deg/(μm × T) at room temperature, which is comparable to the data for thick yttriu-iron- garnet films obtained, for example, by the standard method of liquid-phase epitaxy.

  • faraday effect
  • yttrium iron-garnet
  • Verde constant
  • thin films
  • critical thickness
  • Magnetically dead layer
  • interface phenomena
Аннотация (на русском)

Магнитооптический эффект Фарадея в наноразмерных структурах на основе BiY2Fe5O12, полученных методом магнетронного распыления

В настоящей работе исследованы особенности фарадеевского вращения света в видимой области спектра в тонкопленочных структурах на основе BiY2Fe5O12 толщиной от 5 до 55 нм. Пленки Bi-допированного железоиттриевого граната, полученные методом магнетронного распыления на монокристаллических подложках из иттрий-алюминиевого (Y3Al5O12) и гадолиний-галлиевого граната (Gd3Ga5O12), демонстрируют магнитооптическое качество, сопоставимое с таковым для объемных образцов BiY2Fe5O12. Установлено, что для исследованных наноструктур вклад подложек в спектральные и полевые зависимости эффекта Фарадея является определяющим. Определение магнитооптических параметров и постоянной Верде подложек позволило выделить вклад подложки и изучить особенности эффекта Фарадея для магнитных пленок с толщиной, меньшей или равной толщине релаксационного слоя на границе пленка/подложка. Отмечается, что в пленках BiY2Fe5O12 с толщиной, меньшей толщины магнитно-мертвого слоя (около 5 нм), эффект Фарадея отсутствует. В то же время в пленках с толщиной более 25 нм удельное фарадеевское вращение составляет около 25 град/(мкм Тл) при комнатной температуре, что сопоставимо с данными для толстых пленок железоиттриевого граната, полученных, например, стандартным методом жидкофазной эпитаксии.

For citation

Artemyev M.S., Sukhorukov Y.P., Telegin A.V., Naumov S.V., Dubinin S.S., Nosov A.P. Magneto-optical Faraday effect in nanoscale structures based on BiY2Fe5O12 obtained by magnetron sputtering // Journal of Radio Electronics. – 2025. – No. 11. https://doi.org/10.30898/1684-1719.2025.11.10

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