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Titre : Magnon-Phonon Coupling in Spintronics
Résumé : Methods for generatingomena at the nanoscale [1]. In the presence of magnetic materials, spin currents can be generated 2O3. The results show four-fold butterfly shape signals, the acoustic spin pumping fingerprint (A-SP) [4]. We have also observed the magneto-rotation coupling in a similar system, ultra-thin film Ta/CoFeB(1.6 nm)/MgO, which induces nonreciprocal acoustic wave attenuation with an unprecedented ratio up to theoretically predicted 100% rectification at the optimized condition [5]. We demonstrated strongly nonreciprocal acoustic attenuation in the power and resonance field separately. These intriguing nonreciprocal features of the presented acoustic devices suggest an extraordinary versatility of acoustomagnetic applications. The marked angular dependence of the nonreciprocal ratio indicates an efficient and adjustable acoustic rectifier. The systematic change of non-reciprocity in the resonance field presents its capability as a new route for the characterization of DMI. Our results indicate that surface acoustic wave provides an efficient tool to generate spin currents and shows its potential to develop spintronic devices.
[1] Y. Otani, M. Shiraishi, A. Oiwa, E. Saitoh, and S. Murakami, Nature Physics 13, 829 (2017).
[2] M. Weiler, L. Dreher, C. Heeg, H. Huebl, R. Gross, M. S. Brandt, and S. T. B. Goennenwein, Physical Review Letters 106, 117601 (2011).
[3] Y. Tserkovnyak, A. Brataas, and G. E. W. Bauer, Physical Review B 66, 224403 (2002).
[4] M. Xu, J. Puebla, F. Auvray, B. Rana, K. Kondou, Y. Otani, Phys. Rev. B. 97, 180301 (2018).
[5] M. Xu, K. Yamamoto, J. Puebla, K. Baumgaertl, B. Rana, K. Miura, H. Takahashi, D. Grundler, S. Maekawa, and Y. Otani, Sci. Adv. 6, 1724-1~4 (2020).
