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Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys.
Iacocca, E; Liu, T-M; Reid, A H; Fu, Z; Ruta, S; Granitzka, P W; Jal, E; Bonetti, S; Gray, A X; Graves, C E; Kukreja, R; Chen, Z; Higley, D J; Chase, T; Le Guyader, L; Hirsch, K; Ohldag, H; Schlotter, W F; Dakovski, G L; Coslovich, G; Hoffmann, M C; Carron, S; Tsukamoto, A; Kirilyuk, A; Kimel, A V; Rasing, Th; Stöhr, J; Evans, R F L; Ostler, T; Chantrell, R W; Hoefer, M A; Silva, T J; Dürr, H A.
Affiliation
  • Iacocca E; Department of Applied Mathematics, University of Colorado, Boulder, CO, 80309, USA.
  • Liu TM; National Institute of Standards and Technology, Boulder, CO, 80305, USA.
  • Reid AH; Department of Physics, Division for Theoretical Physics, Chalmers University of Technology, Gothenburg, 412 96, Sweden.
  • Fu Z; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Ruta S; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Granitzka PW; School of Physics, Science, and Engineering, Tongji University, Shanghai, 200092, China.
  • Jal E; Department of Physics, University of York, York, YO10 5DD, UK.
  • Bonetti S; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Gray AX; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Graves CE; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Kukreja R; Department of Physics, Stockholm University, Stockholm, 106 91, Sweden.
  • Chen Z; Department of Molecular Science and Nanosystems, Ca' Foscari University of Venice, Venezia-Mestre, 30172, Italy.
  • Higley DJ; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Chase T; Department of Physics, Temple University, 1925 N. 12th St., Philadelphia, PA, 19122, USA.
  • Le Guyader L; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Hirsch K; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Ohldag H; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Schlotter WF; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Dakovski GL; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Coslovich G; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Hoffmann MC; Spectroscopy & Coherent Scattering, European X-Ray Free-Electron Laser Facility GmbH, Holzkoppel 4, 22869, Schenefeld, Germany.
  • Carron S; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Tsukamoto A; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Kirilyuk A; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Kimel AV; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Rasing T; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Stöhr J; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Evans RFL; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
  • Ostler T; Department of Electronics and Computer Science, Nihon University, 7-24-1 Narashino-dai Funabashi, Chiba, 274-8501, Japan.
  • Chantrell RW; Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
  • Hoefer MA; Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
  • Silva TJ; Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
  • Dürr HA; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
Nat Commun ; 10(1): 1756, 2019 04 15.
Article in En | MEDLINE | ID: mdl-30988403
ABSTRACT
Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty in experimentally probing such rapid dynamics. Here, we find evidence of a universal rapid magnetic order recovery in ferrimagnets with perpendicular magnetic anisotropy via nonlinear magnon processes. We identify magnon localisation and coalescence processes, whereby localised magnetic textures nucleate and subsequently interact and grow in accordance with a power law formalism. A hydrodynamic representation of the numerical simulations indicates that the appearance of noncollinear magnetisation via optical pumping establishes exchange-mediated spin currents with an equivalent 100% spin polarised charge current density of 107 A cm-2. Such large spin currents precipitate rapid recovery of magnetic order after optical pumping. The magnon processes discussed here provide new insights for the stabilization of desired meta-stable states.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nat Commun Journal subject: BIOLOGIA / CIENCIA Year: 2019 Document type: Article Affiliation country:
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nat Commun Journal subject: BIOLOGIA / CIENCIA Year: 2019 Document type: Article Affiliation country: