Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization

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

doi:10.1103/physrevb.94.220408

Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization

Journal Article · Wed Dec 28 00:00:00 EST 2016 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.94.220408· OSTI ID:1680051

Turgut, Emrah ^[1]; Zusin, Dmitriy ^[2]; Legut, Dominik ^[3]; Carva, Karel ^[4]; Knut, Ronny ^[2]; Shaw, Justin M. ^[5]; Chen, Cong ^[2]; Tao, Zhensheng ^[2]; Nembach, Hans T. ^[5]; Silva, Thomas J. ^[5]; Mathias, Stefan ^[6]; Aeschlimann, Martin ^[7]; Oppeneer, Peter M. ^[8]; Kapteyn, Henry C. ^[2]; Murnane, Margaret M. ^[2]; Grychtol, Patrik ^[2]

University of Colorado, Boulder, CO (United States); JILA/University of Colorado Boulder, Boulder, CO
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)

Understanding how the electronic band structure of a ferromagnetic material is modified during laser-induced demagnetization on femtosecond timescales 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 lms after optical pumping to induce ultrafast demagnetization. This provides a complete data set that we can compare with advanced ab initio magneto-optical calculations. Here, tur analysis identifies that the dominant mechanisms contributing to ultrafast demagnetization on timescales up to several picoseconds are a transient reduction in the exchange splitting and the excitation of ultrafast magnons. Surprisingly, we nd that the magnon contribution to ultrafast demagnetization is already strong on sub-picosecond timescales, while the reduction in exchange splitting persists to several picoseconds.

View Accepted Manuscript (DOE)

Research Organization:: National Inst. of Standards and Technology (NIST), Boulder, CO (United States); University of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0002002; SC0006991

OSTI ID:: 1680051

Alternate ID(s):: OSTI ID: 1338086
OSTI ID: 1535807
OSTI ID: 1968486

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 94; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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