Direct measurement of the static and transient magneto-optical permittivity of cobalt across the entire M-edge in reflection geometry by use of polarization scanning

Zusin, Dmitriy; Tengdin, Phoebe M.; Gopalakrishnan, Maithreyi; Gentry, Christian; Blonsky, Adam; Gerrity, Michael; Legut, Dominik; Shaw, Justin M.; Nembach, Hans T.; Silva, T. J.; Oppeneer, Peter M.; Kapteyn, Henry C.; Murnane, Margaret M.

doi:10.1103/physrevb.97.024433

Title: Direct measurement of the static and transient magneto-optical permittivity of cobalt across the entire M-edge in reflection geometry by use of polarization scanning

Journal Article · Tue Jan 30 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.97.024433· OSTI ID:1678732

Zusin, Dmitriy ^[1]; Tengdin, Phoebe M. ^[1]; Gopalakrishnan, Maithreyi ^[1]; Gentry, Christian ^[1]; Blonsky, Adam ^[1]; Gerrity, Michael ^[1]; Legut, Dominik ^[2]; Shaw, Justin M. ^[3]; Nembach, Hans T. ^[3]; Silva, T. J. ^[3]; Oppeneer, Peter M. ^[4]; Kapteyn, Henry C. ^[1]; Murnane, Margaret M. ^[1]

University of Colorado, Boulder, CO (United States)
VSB Technical University Ostrava (Czech-Republic)
National Institute of Standards and Technology, Boulder, CO (United States)
Uppsala University (Sweden)

The microscopic state of a magnetic material is characterized by its resonant magneto-optical response through the off-diagonal dielectric tensor component ε_xy. However, the measurement of the full complex ε_xy in the extreme ultraviolet spectral region covering the M absorption edges of 3d ferromagnets is challenging due to the need for either a careful polarization analysis, which is complicated by a lack of efficient polarization analyzers, or scanning the angle of incidence in fine steps. Here, we propose and demonstrate a technique to extract the complex resonant permittivity ε_xy simply by scanning the polarization angle of linearly polarized high harmonics to measure the magneto-optical asymmetry in reflection geometry. Because this technique is more practical and faster to experimentally implement than previous approaches, we can directly measure the full time evolution of ε_xy (t) during laser-induced demagnetization across the entire M_2,3 absorption edge of cobalt with femtosecond time resolution. We find that for polycrystalline Co films on an insulating substrate, the changes in ε_xy are uniform throughout the spectrum, to within our experimental precision. This result suggests that, in the regime of strong demagnetization, the ultrafast demagnetization response is primarily dominated by magnon generation. Here, we estimate the contribution of exchange-splitting reduction to the ultrafast demagnetization process to be no more than 25%.

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Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; Knut and Alice Wallenberg Foundation; USDOE

Grant/Contract Number:: SC0002002; GBMF4538; 2015.0060

OSTI ID:: 1678732

Alternate ID(s):: OSTI ID: 1418717; OSTI ID: 1957815

Journal Information:: Physical Review B, Vol. 97, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Magnetism
Magnetization switching
Magneto-optical Kerr effect
Magneto-optical effect
Magneto-optical spectra
Surface magneto-optical Kerr effect
Ultrafast phenomena
Magnetic multilayers
Magnetic techniques
Optical absorption spectroscopy
Ultrafast pump-probe spectroscopy