On Tuesday November 07^th 2023, we have the pleasure to welcome in SPINTEC Massimiliano Marangolo from Sorbonne Université. He will give us a seminar at 11:00 entitled :
Surface-Acoustic-Wave Induced Ferromagnetic Resonance and possible magnonic applications.

Place : IRIG/SPINTEC, auditorium 445 CEA Building 10.05 (access to CEA (*))

skype link : https://webconf.cea.fr/ioan-lucian.prejbeanu/C89D5FFJ

If the link does not work, try with skype web App : https://webconf.cea.fr/ioan-lucian.prejbeanu/C89D5FFJ?sl=1

or by phone +33 1 69 35 55 10 conf ID : 5909422

Abstract : The interaction between Surface Acoustic Waves (SAW) and Spin Waves (SW) in heterostructures composed of piezoelectric and magnetostrictive materials will be discussed in the framework of the SAW-induced Ferromagnetic Resonance (FMR) and SW-generation. It is well established that Interdigitated Transducers (IDT) exciting SAW in the GHz and sub-GHz regime in a piezoelectric media (see IDT in Fig.1), permit SAW-FMR in ferromagnetic thin films, as Ni and GaMnAs. [1,2]
Here, I will focus on recent experiments on Fe thin films epitaxied on a piezoelectric GaAs(001) substrate that have demonstrated efficient resonant MEC through SAW.[3,4] This study investigates the impact of an external magnetic field on the velocity and the amplitude of surface acoustic waves (SAWs). The SAW velocity is found to be strongly influenced by both the amplitude and direction of the magnetic field. To explain these observations, the study employs a phenomenological model that considers the relative change in SAW velocity, with a key factor being the inclusion of spin-wave dispersion. The validity of this model is confirmed through comparisons with a fully magnetoelastic model. Additionally, the study explores the nonreciprocity of SAWs’ propagation both experimentally and theoretically.
Concerning magnonic applications, we note that SAWs can propagate over long distances in piezoelectric materials like LiNbO3 or GaAs. Consequently, SAWs generated by a single Interdigital Transducer (IDT) may interact with thousands of magnonic circuits since SAW spread over millimetres square in a well-controlled manner. These experiments suggest the integration of SAW-FMR mechanism in magnonic devices where SWs, generated by antennas or by dynamic strain could be locally handled, triggered, scattered or even suppressed by SAWs excited, in turn, by remote voltage-driven IDTs.

1.  Weiler M, Dreher L, Heeg C, Huebl H, Gross R, Brandt M S and Goennenwein S T B 2011 Elastically driven ferromagnetic resonance in nickel thin films Phys. Rev. Lett. 106 117601
2. Thevenard L, Gourdon C, Prieur J Y, von Bardeleben H J, Vincent S, Becerra L, Largeau L and Duquesne J-Y 2014 Surface-acoustic-wave-driven ferromagnetic resonance in (Ga, Mn)(As, P) epilayers Phys. Rev. B 90 094401
3. Duquesne J-Y, Rovillain P, Hepburn C, Eddrief M, Atkinson P, Anane A, Ranchal R and Marangolo M 2019 Surface-acoustic-wave induced ferromagnetic resonance in Fe thin films and magnetic field sensing Phys. Rev Appl. 12 024042
4. P. Rovillain, J.-Y. Duquesne, L. Christienne, M. Eddrief, M. G. Pini, A. Rettori, S. Tacchi, and M. Marangolo 2022 Impact of Spin-Wave Dispersion on Surface-Acoustic-Wave Velocity Phys. Rev Appl. 18 064043

Biography : Max Marangolo holds a Laurea degree from Bologna (Italy) and a DEA in solid-state physics from the University of Paris 11. His doctoral research at the Laboratory of Mineralogy and Crystallography focused on solid-state electronic structure and synchrotron techniques (Compton scattering). During his postdoc at Université Pierre et Marie Curie, he began researching epitaxial magnetic thin films propereties. His research concentrated on tunnel junctions for spin electronics, involving semiconducting tunnel barriers between two ferromagnetic electrodes. This work encompassed both lab experiments and synchrotron beamline studies. Following the integration of his group into INSP in 2005, his research has diversified, encompassing synchrotron-based photoemission studies of epitaxial graphene and investigations into alternative methods for magnetic property control, including acoustics and various magnetic measurement techniques. He also explored materials with ferromagnetic and piezoelectric heterostructures, collaborating on magneto-caloric and magneto-electric systems for medical applications. Additionally, he initiated a collaboration on measuring thermal conductivity in thin films for thermoelectric applications. In 2019, he assumed the role of director of INSP (UMR CNRS and Sorbonne Université) and the co-responsibility for the Science des Matériaux et Nanoobjets Master program at Sorbonne Université.
address : Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, 4 place Jussieu, F-75005 Paris, France

(*) Access to CEA requires an entry authorization. request it sufficiently in advance : before October 20^th at admin.spintec@cea.fr