Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization
Abstract
Understanding how the electronic band structure of a ferromagnetic material is modified during laser-induced demagnetization on femtosecond time scales has been a long-standing question in condensed matter physics. Here, we use ultrafast high harmonics to measure time-, energy-, and angle-resolved M -edge magnetic asymmetry spectra for Co films after optical pumping to induce ultrafast demagnetization. This provides a complete data set that we can compare with advanced ab initio magneto-optical calculations. Our analysis identifies that the dominant mechanisms contributing to ultrafast demagnetization on time scales up to several picoseconds are a transient reduction in the exchange splitting and the excitation of ultrafast magnons. Surprisingly, we find that the magnon contribution to ultrafast demagnetization is already strong on subpicosecond time scales, while the reduction in exchange splitting persists to several picoseconds.
- Authors:
-
- University of Colorado, Boulder, CO (United States)
- VSB Technical University of Ostrava (Czech Republic); Charles University, Prague (Czech Republic)
- Charles University, Prague (Czech Republic); Uppsala University (Sweden)
- National Institute of Standards and Technology, Boulder, CO (United States)
- Georg-August-Universität Göttingen (Germany)
- University of Kaiserslautern and Research Center OPTIMAS (Germany)
- Uppsala University (Sweden)
- Publication Date:
- Research Org.:
- Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
- OSTI Identifier:
- 1680051
- Alternate Identifier(s):
- OSTI ID: 1338086; OSTI ID: 1968486
- Grant/Contract Number:
- SC0002002; SC0006991
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 22; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetization switching; Magneto-optical effect; Ultrafast phenomena; Optical absorption spectroscopy; Surface magneto-optical Kerr effect; Ultrafast pump-probe spectroscopy; 36 MATERIALS SCIENCE
Citation Formats
Turgut, Emrah, Zusin, Dmitriy, Legut, Dominik, Carva, Karel, Knut, Ronny, Shaw, Justin M., Chen, Cong, Tao, Zhensheng, Nembach, Hans T., Silva, Thomas J., Mathias, Stefan, Aeschlimann, Martin, Oppeneer, Peter M., Kapteyn, Henry C., Murnane, Margaret M., and Grychtol, Patrik. Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization. United States: N. p., 2016.
Web. doi:10.1103/physrevb.94.220408.
Turgut, Emrah, Zusin, Dmitriy, Legut, Dominik, Carva, Karel, Knut, Ronny, Shaw, Justin M., Chen, Cong, Tao, Zhensheng, Nembach, Hans T., Silva, Thomas J., Mathias, Stefan, Aeschlimann, Martin, Oppeneer, Peter M., Kapteyn, Henry C., Murnane, Margaret M., & Grychtol, Patrik. Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization. United States. https://doi.org/10.1103/physrevb.94.220408
Turgut, Emrah, Zusin, Dmitriy, Legut, Dominik, Carva, Karel, Knut, Ronny, Shaw, Justin M., Chen, Cong, Tao, Zhensheng, Nembach, Hans T., Silva, Thomas J., Mathias, Stefan, Aeschlimann, Martin, Oppeneer, Peter M., Kapteyn, Henry C., Murnane, Margaret M., and Grychtol, Patrik. Wed .
"Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization". United States. https://doi.org/10.1103/physrevb.94.220408. https://www.osti.gov/servlets/purl/1680051.
@article{osti_1680051,
title = {Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization},
author = {Turgut, Emrah and Zusin, Dmitriy and Legut, Dominik and Carva, Karel and Knut, Ronny and Shaw, Justin M. and Chen, Cong and Tao, Zhensheng and Nembach, Hans T. and Silva, Thomas J. and Mathias, Stefan and Aeschlimann, Martin and Oppeneer, Peter M. and Kapteyn, Henry C. and Murnane, Margaret M. and Grychtol, Patrik},
abstractNote = {Understanding how the electronic band structure of a ferromagnetic material is modified during laser-induced demagnetization on femtosecond time scales has been a long-standing question in condensed matter physics. Here, we use ultrafast high harmonics to measure time-, energy-, and angle-resolved M -edge magnetic asymmetry spectra for Co films after optical pumping to induce ultrafast demagnetization. This provides a complete data set that we can compare with advanced ab initio magneto-optical calculations. Our analysis identifies that the dominant mechanisms contributing to ultrafast demagnetization on time scales up to several picoseconds are a transient reduction in the exchange splitting and the excitation of ultrafast magnons. Surprisingly, we find that the magnon contribution to ultrafast demagnetization is already strong on subpicosecond time scales, while the reduction in exchange splitting persists to several picoseconds.},
doi = {10.1103/physrevb.94.220408},
journal = {Physical Review. B},
number = 22,
volume = 94,
place = {United States},
year = {Wed Dec 28 00:00:00 EST 2016},
month = {Wed Dec 28 00:00:00 EST 2016}
}
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Figures / Tables:
FIG. 1: a) Setup for time-, energy- and angle-resolved TMOKE. b) Transient avg. normalized magnetization $∆m$avg. c) Evolution of the electron and lattice temperatures estimated from the three temperature model (lines). The inset illustrates the microscopic mechanisms behind laser-induced demagnetization dynamics: Ultrafast magnons (top), exchange reduction and thermal smearing (middlemore »
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