Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo

Graves, C. E.; Reid, A. H.; Wang, T.; Wu, B.; de Jong, S.; Vahaplar, K.; Radu, I.; Bernstein, D. P.; Messerschmidt, M.; Müller, L.; Coffee, R.; Bionta, M.; Epp, S. W.; Hartmann, R.; Kimmel, N.; Hauser, G.; Hartmann, A.; Holl, P.; Gorke, H.; Mentink, J. H.; Tsukamoto, A.; Fognini, A.; Turner, J. J.; Schlotter, W. F.; Rolles, D.; Soltau, H.; Strüder, L.; Acremann, Y.; Kimel, A. V.; Kirilyuk, A.; Rasing, Th.; Stöhr, J.; Scherz, A. O.; Dürr, H. A.

doi:10.1038/NMAT3597

Title: Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo

Journal Article · Sun Mar 17 00:00:00 EDT 2013 · Nature Materials

DOI:https://doi.org/10.1038/NMAT3597· OSTI ID:1443248

Graves, C. E. ^[1]; Reid, A. H. ^[2]; Wang, T. ^[3]; Wu, B. ^[1]; de Jong, S. ^[4]; Vahaplar, K. ^[5]; Radu, I. ^[6]; Bernstein, D. P. ^[1]; Messerschmidt, M. ^[4]; Müller, L. ^[7]; Coffee, R. ^[4]; Bionta, M. ^[4]; Epp, S. W. ^[8]; Hartmann, R. ^[9]; Kimmel, N. ^[10]; Hauser, G. ^[10]; Hartmann, A. ^[9]; Holl, P. ^[9]; Gorke, H. ^[11]; Mentink, J. H. ^[5] more »

SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Radboud University Nijmegen, Nijmegen (The Netherlands)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
Radboud University Nijmegen, Nijmegen (The Netherlands)
Radboud University Nijmegen, Nijmegen (The Netherlands); Helmholtz-Zentrum Berlin (HZB), (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Center for Free-Electron Laser Science (CFEL), Hamburg (Germany)
PNSensor, München (Germany)
Max Planck Inst. for Extraterrestrial Physics, Garching (Germany)
Julich Research Centre (Germany)
Nihon Univ., Chiba (Japan)
Federal Inst. of Technology, Zurich (Switzerland)

Ultrafast laser techniques have revealed extraordinary spin dynamics in magnetic materials that equilibrium descriptions of magnetism cannot explain. Particularly important for future applications is understanding non-equilibrium spin dynamics following laser excitation on the nanoscale, yet the limited spatial resolution of optical laser techniques has impeded such nanoscale studies. Here in this paper, we present ultrafast diffraction experiments with an X-ray laser that probes the nanoscale spin dynamics following optical laser excitation in the ferrimagnetic alloy GdFeCo, which exhibits macroscopic all-optical switching. Our study reveals that GdFeCo displays nanoscale chemical and magnetic inhomogeneities that affect the spin dynamics. In particular, we observe Gd spin reversal in Gd-rich nanoregions within the first picosecond driven by the non-local transfer of angular momentum from larger adjacent Fe-rich nanoregions. These results suggest that a magnetic material’s microstructure can be engineered to control transient laser-excited spins, potentially allowing faster (~ 1 ps) spin reversal than in present technologies.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1443248

Report Number(s):: SLAC-PUB-15312

Journal Information:: Nature Materials, Vol. 12, Issue 4; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 221 works

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