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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20210927T100000
DTEND;TZID=Europe/Paris:20210927T180000
DTSTAMP:20210923T092000
UID:MEC-8208974663db80265e9bfe7b222dcb18@lps.u-psud.fr
CREATED:20210923
LAST-MODIFIED:20210923
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:YoshiChika OTANI, Magnon-Phonon Coupling in Spintronics
DESCRIPTION:\nISSP, the University of Tokyo, Kashiwa 277-858, JapanCEMS RIKEN Wako 351-0198, Japan\n\n\n\nAttention, le séminaire aura lieu à 10h00 (amphi Blandin du LPS au lieu de 14h00 comme d’habitude et sera diffusésur zoom: https://zoom.us/j/97017697946?pwd=QXlBOUhaYmFEQk5FeTBaYWs2aFhPZz09.\n\n\n\nMethods for generating spin current and its conversion to electrical charge have been vigorouslystudied in recent years, mainly based on physical phenomena at the nanoscale [1]. In the presence ofmagnetic materials, spin currents can be generated by magnon-photon or magnon-phonon coupling.Magnon-phonon coupling can be achieved by passing surface acoustic waves (SAW) acrossferromagnetic layers due to the magnetoelastic effect [2], driving magnetization dynamics such asferromagnetic resonance (FMR). This process is known as acoustic FMR(A-FMR), and isanalogous to the most common FMR driven by electromagnetic wave photons. Both FMR and A-FMR are used as a mechanism for the spin current generation, which can be injected into adjacentnonmagnetic layers, a process better known as spin pumping [3]. We have recently demonstratedthe spin to charge current conversion via magnon-phonon coupling and inverse Edelstein effect atthe hybrid device Ni/Cu(Ag)/Bi2O3. The results show four-fold butterfly shape signals, the acousticspin pumping fingerprint (A-SP) [4]. We have also observed the magneto-rotation coupling in asimilar system, ultra-thin film Ta/CoFeB(1.6 nm)/MgO, which induces nonreciprocal acoustic waveattenuation with an unprecedented ratio up to 77% and theoretically predicted 100% rectification atthe optimized condition [5]. We demonstrated strongly nonreciprocal acoustic attenuation in thepower and resonance field separately. These intriguing nonreciprocal features of the presentedacoustic devices suggest an extraordinary versatility of acoustomagnetic applications. The markedangular 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 newroute for the characterization of DMI. Our results indicate that surface acoustic wave provides anefficient tool to generate spin currents and shows its potential to develop spintronic devices.\n\n\n\n[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).\n
URL:https://www.lps.u-psud.fr/en/events/yoshichika-otani-magnon-phonon-coupling-in-spintronics-2/
CATEGORIES:General Seminars,Seminars
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