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Title: Ultrafast optically induced spin transfer in ferromagnetic alloys

Abstract

The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all-optical manipulation requires control schemes for which the electronic or magnetic subsystems of the materials are coherently manipulated on the time scale of the laser excitation pulse. In our work, we provide experimental evidence of such a direct, ultrafast, and coherent spin transfer between two magnetic subsystems of an alloy of Fe and Ni. Our experimental findings are fully supported by time-dependent density functional theory simulations and, hence, suggest the possibility of coherently controlling spin dynamics on subfemtosecond time scales, i.e., the birth of the research area of attomagnetism.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [2];  [5]; ORCiD logo [2];  [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8];  [2];  [7]; ORCiD logo [9]; ORCiD logo [1];  [10]; ORCiD logo [2]; ORCiD logo [9]
  1. Technische Universität Kaiserslautern und Landesforschungszentrum OPTIMAS, Kaiserslautern (Germany); Graduate School of Excellence Materials Science in Mainz (Germany)
  2. Technische Universität Kaiserslautern und Landesforschungszentrum OPTIMAS, Kaiserslautern (Germany)
  3. Max Planck Institute of Microstructure Physics, Halle (Germany)
  4. University of Colorado and NIST, Boulder, Colorado (United States)
  5. University of Colorado and NIST, Boulder, Colorado (United States); National Institute of Standards and Technology, Boulder, CO (United States)
  6. National Institute of Standards and Technology, Boulder, CO (United States)
  7. University of Colorado and NIST, Boulder, CO (United States)
  8. Technische Universität Dortmund (Germany)
  9. Georg-August-Universität Göttingen (Germany)
  10. Max Born Institute for Nonlinear Optics, Berlin (Germany)
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1626054
Alternate Identifier(s):
OSTI ID: 1678723
Grant/Contract Number:  
SC0002002
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Science & Technology - Other Topics

Citation Formats

Hofherr, M., Häuser, S., Dewhurst, J. K., Tengdin, P., Sakshath, S., Nembach, H. T., Weber, S. T., Shaw, J. M., Silva, T. J., Kapteyn, H. C., Cinchetti, M., Rethfeld, B., Murnane, M. M., Steil, D., Stadtmüller, B., Sharma, S., Aeschlimann, M., and Mathias, S. Ultrafast optically induced spin transfer in ferromagnetic alloys. United States: N. p., 2020. Web. doi:10.1126/sciadv.aay8717.
Hofherr, M., Häuser, S., Dewhurst, J. K., Tengdin, P., Sakshath, S., Nembach, H. T., Weber, S. T., Shaw, J. M., Silva, T. J., Kapteyn, H. C., Cinchetti, M., Rethfeld, B., Murnane, M. M., Steil, D., Stadtmüller, B., Sharma, S., Aeschlimann, M., & Mathias, S. Ultrafast optically induced spin transfer in ferromagnetic alloys. United States. https://doi.org/10.1126/sciadv.aay8717
Hofherr, M., Häuser, S., Dewhurst, J. K., Tengdin, P., Sakshath, S., Nembach, H. T., Weber, S. T., Shaw, J. M., Silva, T. J., Kapteyn, H. C., Cinchetti, M., Rethfeld, B., Murnane, M. M., Steil, D., Stadtmüller, B., Sharma, S., Aeschlimann, M., and Mathias, S. Fri . "Ultrafast optically induced spin transfer in ferromagnetic alloys". United States. https://doi.org/10.1126/sciadv.aay8717. https://www.osti.gov/servlets/purl/1626054.
@article{osti_1626054,
title = {Ultrafast optically induced spin transfer in ferromagnetic alloys},
author = {Hofherr, M. and Häuser, S. and Dewhurst, J. K. and Tengdin, P. and Sakshath, S. and Nembach, H. T. and Weber, S. T. and Shaw, J. M. and Silva, T. J. and Kapteyn, H. C. and Cinchetti, M. and Rethfeld, B. and Murnane, M. M. and Steil, D. and Stadtmüller, B. and Sharma, S. and Aeschlimann, M. and Mathias, S.},
abstractNote = {The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all-optical manipulation requires control schemes for which the electronic or magnetic subsystems of the materials are coherently manipulated on the time scale of the laser excitation pulse. In our work, we provide experimental evidence of such a direct, ultrafast, and coherent spin transfer between two magnetic subsystems of an alloy of Fe and Ni. Our experimental findings are fully supported by time-dependent density functional theory simulations and, hence, suggest the possibility of coherently controlling spin dynamics on subfemtosecond time scales, i.e., the birth of the research area of attomagnetism.},
doi = {10.1126/sciadv.aay8717},
journal = {Science Advances},
number = 3,
volume = 6,
place = {United States},
year = {2020},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: Ultrafast OISTR in Fe50Ni50. (A) Schematic overview of the OISTR effect in Fe50Ni50. The optical excitation by the IR pump leads to an effective spin transfer from the occupied Ni minority channel into the Fe minority channel. Note that other excitations are also possible, and significant OISTR canmore » only be expected if such a spin transfer transition dominates the full excitation process. (B) Projected density of states (DOS) calculation for Fe50Ni50 for Fe (green) and Ni (blue) demonstrating the favorable spin transfer from Ni to Fe in the minority channel. (C and D) TD-DFT calculations of the difference of the transient occupation compared with the unexcited case in the minority channels of Ni (C) and Fe (D) at characteristic time steps demonstrating the OISTR effect. In Ni at energies between 0.5 and 3 eV below the Fermi level, a negative signal arises corresponding to a loss of minority electrons, while a simultaneous positive signal correlating to minority spin gain is visible in Fe at equivalent energies above the Fermi level.« less

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