Polzikova N.I., Alekseev S.G., Pyataikin I.I., Kotelyanskii I.M., Luzanov V.A., Raevskiy A.O. Spin pumping via bulk acoustic wave modes in composite resonator with YIG/Pt bilayer. In: Moscow International Symposium on Magnetism - 2017 (MISM - 2017), 2 - 5 июля 2017 г., МГУ им. М.В. Ломоносова, физический факультет , Издательство МГУ , р. 958.
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Текст
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Аннотация
Generation of spin currents in a ferromagnet/paramagnet junction caused by acoustically driven magnetization precession, acoustic spin pumping (ASP), was proposed recently. ASP in different spintronic ME structures both under magnetoelastic resonance (MER) and the off-resonance conditions was demonstrated. In particular, considerable attention was drawn to using surface acoustic waves for magnetic dynamics resonance excitation and ASP. More recently, we proposed ASP via MER excitation in a magnetoelectric composite high overtone bulk acoustic wave (BAW) resonator (HBAR) formed by Al-ZnO-Al-GGG-YIG-Pt structure [1]. The schematics of our experimental structure is shown in Fig. 1. Magnetic dynamics excited by transversal BAW modes induces pure spin current j_s from YIG film into a thin Pt layer. It was shown that the dc voltage U_ISHE measured on Pt stripe is created by ASP and spin (j_s) - to charge (j_c) current conversion due to inverse spin-Hall effect (ISHE) in platinum. Here, we present some important features of ASP in such a system. The measured voltage U_ISHE and HBAR frequency shift Δf_n dependences on magnetic field H and frequency f have a resonant character and correlate with each other. However, there is some discrepancy between the values of HBAR resonant frequency f_n for a given magnetic field and the frequency at which the maximum dc voltage is observed. We attribute this to the fact that under MER condition, HBAR frequency f_n is determined both by a change in the boundary conditions and by a change in the phase shift (mainly) in the volume of YIG film, while the magnitude of the injected spin current depends on the magnetization precession amplitude at the YIG/Pt interface. The influence of magnetoelastic anisotropy and the mutual orientation of the transverse BAW polarization, the bias magnetic field and the Pt strip axis on the maximal value of HBAR frequency shift Δf_n and ISHE voltage U_ISHE is studied in detail. The observed deviation from sinusoidal behavior of U_ISHE(θ) and Δf_n(θ) is explained in the model taking into account the difference in the efficiency of magnetic precession excitation by BAW with the components of elastic displacement that are in parallel and perpendicular to the bias field. To achieve the maximal value of UISHE, the piezoelectric axis c projection should be oriented perpendicular to the axis of the Pt strip and parallel to the crystallographic axis <-110 > of YIG.
| Тип объекта: | Доклад на конференции или семинаре (Доклад) |
|---|---|
| Авторы на русском. ОБЯЗАТЕЛЬНО ДЛЯ АНГЛОЯЗЫЧНЫХ ПУБЛИКАЦИЙ!: | Ползикова Н. И., Алексеев С. Г., Пятайкин И. И., Котелянский И. М., Лузанов В. А., Раевский А. О. |
| Подразделения (можно выбрать несколько, удерживая Ctrl): | 171 лаб. полупроводниковых приборов 216 лаб. технологических процессов твердотельной электроники |
| URI: | http://cplire.ru:8080/id/eprint/4440 |
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- Spin pumping via bulk acoustic wave modes in composite resonator with YIG/Pt bilayer. (deposited 22 Авг 2018 15:13) [В настоящее время Отображен]
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