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Analysis of the lin...
Analysis of the linear relationship between asymmetry and magnetic moment at the M edge of 3d transition metals
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- Jana, Somnath (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Malik, Rameez S. (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Kvashnin, Yaroslav O. (author)
- Uppsala universitet,Materialteori
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- Locht, Inka L. M. (author)
- Uppsala universitet,Materialteori
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- Knut, Ronny (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Stefanuik, Robert (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Di Marco, Igor (author)
- Uppsala universitet,Materialteori,Asia Pacific Center for Theoretical Physics, Pohang, Gyeonbuk, Republic of Korea; Department of Physics, POSTECH, Pohang, Gyeonbuk, Republic of Korea
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- Yaresko, A. N. (author)
- Max-Planck-Institut für Festkörrperforschung, Stuttgart, Germany
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- Ahlberg, Martina (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Department of Physics, University of Gothenburg, Gothenburg, Sweden
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- Åkerman, Johan, 1970 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Department of Physics, University of Gothenburg, Gothenburg, Sweden
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- Chimata, Raghuveer (author)
- Uppsala universitet,Materialteori,Argonne National Laboratory, Lemont, Illinois, USA
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- Battiato, M. (author)
- Nanyang Technological University, Singapore
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- Söderström, Johan, 1978- (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Eriksson, Olle, 1960- (author)
- Uppsala universitet,Örebro universitet,Institutionen för naturvetenskap och teknik,Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden,Materialteori,School of Science and Technology, Örebro University
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- Karis, Olof (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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(creator_code:org_t)
- American Physical Society, 2020
- 2020
- English.
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In: Physical Review Research. - : American Physical Society. - 2643-1564. ; 2:1
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Abstract
Subject headings
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- The magneto-optical response of Fe and Ni during ultrafast demagnetization is studied experimentally and theoretically. We have performed pump-probe experiments in the transverse magneto-optical Kerr effect (T-MOKE) geometry using photon energies that cover the M absorption edges of Fe and Ni between 40 and 72 eV. The magnetic asymmetry was obtained by forming the difference of reflected intensities obtained for two opposite orientations of the sample magnetization. Density functional theory (DFT) was used to calculate the magneto-optical response of different magnetic configurations, representing different types of excitations: long wavelength magnons, short wavelength magnons, and Stoner excitations. In the case of Fe, we find that the calculated asymmetry is strongly dependent on the specific type of magnetic excitation. Our modeling also reveals that during remagnetization Fe is, to a reasonable approximation, described by magnons, even though small nonlinear contributions could indicate some degree of Stoner excitations as well. In contrast, we find that the calculated asymmetry in Ni is rather insensitive to the type of magnetic excitations. However, there is a weak nonlinearity in the relation between asymmetry and the off-diagonal component of the dielectric tensor, which does not originate from the modifications of the electronic structure. Our experimental and theoretical results thus emphasize the need to consider a coupling between asymmetry and magnetization that may be more complex than a simple linear relationship. This insight is crucial for the microscopic interpretation of ultrafast magnetization experiments.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- angular-momentum
- ultrafast
- nickel
- Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Jana, Somnath
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Malik, Rameez S.
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Kvashnin, Yarosl ...
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Locht, Inka L. M ...
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Knut, Ronny
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Stefanuik, Rober ...
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show more...
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Di Marco, Igor
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Yaresko, A. N.
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Ahlberg, Martina
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Åkerman, Johan, ...
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Chimata, Raghuve ...
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Battiato, M.
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Söderström, Joha ...
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Eriksson, Olle, ...
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Karis, Olof
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
- Articles in the publication
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Physical Review ...
- By the university
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University of Gothenburg
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Örebro University
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Uppsala University