Atsarkin V.A., Sorokin B.V., Borisenko I.V., Demidov V.V., Ovsyannikov G.A. Resonance spin-charge phenomena in manganite thin films and bilayers. In: Modern Development of Magnetic Resonance. International Conference., 22-25.09.2015, Казань , Казанский физико-технический институт КНЦ РАН , р. 6.
Полный текст не доступен из этого репозитория. (Заказать копию)Аннотация
The dc voltage generated by microwave pumping under conditions of ferromagnetic resonance has been studied in thin epitaxial films of the manganite La0.67Sr0.33MnO3 and bilayer structures manganite/non-magnetic metals (Au, Pt, and SrRuO3) grown on the NdGaO3 substrate. The studies were performed in the temperature range up to the Curie point (TC ~ 340 K). The effect is shown to be caused by two different phenomena: (1) the resonance dc electromotive force related to anisotropic magnetoresistance in the manganite film and (2) pure spin current (spin pumping) generated in the FMR-excited ferromagnet and flowing across the interface with the non-magnetic metal, where it is registered by means of the inverse spin Hall effect. The two phenomena were separated using the angular dependence of the effect, the external magnetic field H0 being rotated in the film plane. The physical mechanism of the electromotive force caused by anisotropic magnetoresistance in the manganite films, as well as the anisotropic magnetoresistance itself, were found to differ considerably from similar effects in traditional ferromagnetic metals. It was proved experimentally that in the manganite films with in-plane magnetic anisotropy the main role is played by colossal magnetoresistance which provides resistivity variations depending on the angle between the sample magnetization and easy axis. This model is related with the theory accounting for spin fluctuations when approaching TC. The dc voltage corresponding to the spin pumping was found to be considerably lower than that reported previously for other ferromagnet/metal structures. This may be attributed to some peculiarities of the manganite films. The work was supported by the Russian Foundation for Basic Research (grants 14-02-00165, 14-07-93105, and 14-07-00258).
| Тип объекта: | Доклад на конференции или семинаре (Приглашенный доклад) |
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| Авторы на русском. ОБЯЗАТЕЛЬНО ДЛЯ АНГЛОЯЗЫЧНЫХ ПУБЛИКАЦИЙ!: | Ацаркин В.А., Сорокин Б.В., Борисенко И.В., Демидов В.В., Овсянников Г.А. |
| Подразделения (можно выбрать несколько, удерживая Ctrl): | 221 лаб. квантово-механических усилителей и генераторов 233 лаб. физических основ функциональной тонкопленочной оксидной электроники |
| URI: | http://cplire.ru:8080/id/eprint/311 |
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