Acoustic spin pumping in magnetoelectric bulk acoustic wave resonator

V. A. Luzanov,A. P. Orlov,I. I. Pyataikin,N. I. Polzikova,S. G. Alekseev,I. M. Kotelyanskii

doi:10.1063/1.4943765

V. A. Luzanov, A. P. Orlov + Show 4 more

Open Access

https://doi.org/10.1063/1.4943765

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Journal: AIP Advances	Publication Date: Mar 8, 2016
Citations: 25	License type: CC BY 3.0

Affiliation: Institute of Radio-Engineering and Electronics

Abstract

We present the generation and detection of spin currents by using magnetoelastic resonance excitation in a magnetoelectric composite high overtone bulk acoustic wave (BAW) resonator (HBAR) formed by a Al-ZnO-Al-GGG-YIG-Pt structure. Transversal BAW drives magnetization oscillations in YIG film at a given resonant magnetic field, and the resonant magneto-elastic coupling establishes the spin-current generation at the Pt/YIG interface. Due to the inverse spin Hall effect (ISHE) this BAW-driven spin current is converted to a dc voltage in the Pt layer. The dependence of the measured voltage both on magnetic field and frequency has a resonant character. The voltage is determined by the acoustic power in HBAR and changes its sign upon magnetic field reversal. We compare the experimentally observed amplitudes of the ISHE electrical field achieved by our method and other approaches to spin current generation that use surface acoustic waves and microwave resonators for ferromagnetic resonance excitation, with the theoretically expected values.

Highlights

A pure spin current is a flux of a spin angular momentum not accompanied by charge transfer and in contrast to a conventional current is totally non-dissipative.[1]
We present the generation and detection of spin currents by using magnetoelastic resonance excitation in a magnetoelectric composite high overtone bulk acoustic wave (BAW) resonator (HBAR) formed by a Al-ZnO-Al-gadolinium - gallium garnet (GGG)-yttrium iron garnet (YIG)-Pt structure
We compare the experimentally observed amplitudes of the inverse spin Hall effect (ISHE) electrical field achieved by our method and other approaches to spin current generation that use surface acoustic waves and microwave resonators for ferromagnetic resonance excitation, with the theoretically expected values