Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Non-ultrafast magnetization dynamics
MA 23.5: Vortrag
Mittwoch, 14. März 2018, 10:30–10:45, H 0112
Ferromagnetic resonance in superconductor/ferromagnet bilayers — •David Sanchez-Manzano1, Myoung-Woo Yoo2, Hiroshi Naganuma2,3, Pierre Mergny2, Abdelmadjid Anane2, Jacobo Santamaria1, and Javier E. Villegas2 — 1GFMC , Dpto F. Materiales, University Complutense of Madrid (Spain) — 2CNRS -Thales, Unité Mixte de Physique, Palaiseau (France) — 3Department of Applied Physics, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo (Japan)
We study the superconductor/ferromagnet proximity effect via ferromagnetic resonance (FMR) [1] in S/F bilayers that combine the high-temperature superconductor YBa2Cu3O7 with different ferromagnets, either Permalloy (NiFe) or the half-metallic La0.7Sr0.3MnO3. We compare the results of this bilayers to reference ferromagnetic single layers to observe how the presence of the superconductor layer affects the FMR signal. The FMR linewidth is studied as a function of temperature (10K-293K) and frequency (up to 20 G Hz) to obtain the damping constant (α) above and below the superconducting critical temperature. The results will be discussed in the frame of the spin-pumping theory considering the superconductor a spin sink where part of the FMR generated angular momentum relaxes in the superconductor through spin-pumping. [2].
[1] Bells, C., Aarts, J. et al. Phys. Rev. Lett. 100 047002 (2008) [2] Yokoyama, T. & Tserkovnyak, Y. Phys. Rev. B 80, 104416 (2009)
Work supported by the ERC grant N 64710 and French ANR grant ANR-15- CE24- 0008-01