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Title: Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics

Abstract

Ferromagnetic metal alloys are today commonly used in spintronic and magnetic data storage devices. These multicompound structures consist of several magnetic sublattices exhibiting both intrinsic and induced magnetic moments. Here, we study the response of the element-specific magnetization dynamics for thin film systems based on purely intrinsic (CoFeB) and partially induced (FePt) magnetic moments using extreme ultraviolet pulses from high-harmonic generation (HHG) as an element-sensitive probe. In FePt, on the one hand, we observe an identical normalized transient magnetization for Fe and Pt throughout both the ultrafast demagnetization and the subsequent remagnetization. On the other hand, Co and Fe show a clear difference in the asymptotic limit of the remagnetization process in CoFeB, which is supported by calculations for the temperature-dependent behavior of the equilibrium magnetization using a dynamic spin model. Furthermore, in this work, we provide a vital step toward a comprehensive understanding of ultrafast light-induced magnetization dynamics in ferromagnetic alloys with sublattices of intrinsic and induced magnetic moments.

Authors:
 [1];  [2];  [3];  [4];  [5];  [4];  [3];  [4];  [6];  [7];  [8];  [8];  [9];  [9];  [10];  [11];  [11];  [1];  [5];  [3] more »;  [2];  [4] « less
+ Show Author Affiliations
  1. Technische Universität Kaiserslautern (Germany); Graduate School Materials Science in Mainz (Germany)
  2. Universität Konstanz (Germany)
  3. POSTECH, Pohang (South Korea); Max Planck POSTECH/KOREA Research Initiative, Pohang (South Korea)
  4. Technische Universität Kaiserslautern (Germany)
  5. University of Augsburg (Germany)
  6. Max Planck POSTECH/KOREA Research Initiative, Pohang (South Korea); Kunsan National University (South Korea)
  7. Chungbuk National University, Cheongju (South Korea)
  8. DGIST, Daegu (South Korea)
  9. University of Colorado and NIST, Boulder, CO (United States)
  10. Technische Universität Dortmund (Germany)
  11. Georg-August-Universität Göttingen (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; USDOE Office of Science (SC)
OSTI Identifier:
1673436
Alternate Identifier(s):
OSTI ID: 1482153; OSTI ID: 1610617; OSTI ID: 1957807
Grant/Contract Number:  
SC0002002
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 17; 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; Exchange interaction; Ultrafast magnetization dynamics; Alloys; High-harmonic generation; Magneto-optical Kerr effect; Multiscale modeling; Materials Science; Physics

Citation Formats

Hofherr, M., Moretti, S., Shim, J., Häuser, S., Safonova, N. Y., Stiehl, M., Ali, A., Sakshath, S., Kim, J. W., Kim, D. H., Kim, H. J., Hong, J. I., Kapteyn, H. C., Murnane, M. M., Cinchetti, M., Steil, D., Mathias, S., Stadtmüller, B., Albrecht, M., Kim, D. E., Nowak, U., and Aeschlimann, M. Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.174419.
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Hofherr, M., Moretti, S., Shim, J., Häuser, S., Safonova, N. Y., Stiehl, M., Ali, A., Sakshath, S., Kim, J. W., Kim, D. H., Kim, H. J., Hong, J. I., Kapteyn, H. C., Murnane, M. M., Cinchetti, M., Steil, D., Mathias, S., Stadtmüller, B., Albrecht, M., Kim, D. E., Nowak, U., & Aeschlimann, M. Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics. United States. https://doi.org/10.1103/physrevb.98.174419
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Hofherr, M., Moretti, S., Shim, J., Häuser, S., Safonova, N. Y., Stiehl, M., Ali, A., Sakshath, S., Kim, J. W., Kim, D. H., Kim, H. J., Hong, J. I., Kapteyn, H. C., Murnane, M. M., Cinchetti, M., Steil, D., Mathias, S., Stadtmüller, B., Albrecht, M., Kim, D. E., Nowak, U., and Aeschlimann, M. Wed . "Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics". United States. https://doi.org/10.1103/physrevb.98.174419. https://www.osti.gov/servlets/purl/1673436.
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@article{osti_1673436,
title = {Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics},
author = {Hofherr, M. and Moretti, S. and Shim, J. and Häuser, S. and Safonova, N. Y. and Stiehl, M. and Ali, A. and Sakshath, S. and Kim, J. W. and Kim, D. H. and Kim, H. J. and Hong, J. I. and Kapteyn, H. C. and Murnane, M. M. and Cinchetti, M. and Steil, D. and Mathias, S. and Stadtmüller, B. and Albrecht, M. and Kim, D. E. and Nowak, U. and Aeschlimann, M.},
abstractNote = {Ferromagnetic metal alloys are today commonly used in spintronic and magnetic data storage devices. These multicompound structures consist of several magnetic sublattices exhibiting both intrinsic and induced magnetic moments. Here, we study the response of the element-specific magnetization dynamics for thin film systems based on purely intrinsic (CoFeB) and partially induced (FePt) magnetic moments using extreme ultraviolet pulses from high-harmonic generation (HHG) as an element-sensitive probe. In FePt, on the one hand, we observe an identical normalized transient magnetization for Fe and Pt throughout both the ultrafast demagnetization and the subsequent remagnetization. On the other hand, Co and Fe show a clear difference in the asymptotic limit of the remagnetization process in CoFeB, which is supported by calculations for the temperature-dependent behavior of the equilibrium magnetization using a dynamic spin model. Furthermore, in this work, we provide a vital step toward a comprehensive understanding of ultrafast light-induced magnetization dynamics in ferromagnetic alloys with sublattices of intrinsic and induced magnetic moments.},
doi = {10.1103/physrevb.98.174419},
journal = {Physical Review B},
number = 17,
volume = 98,
place = {United States},
year = {Wed Nov 14 00:00:00 EST 2018},
month = {Wed Nov 14 00:00:00 EST 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/physrevb.98.174419
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Cited by: 21 works
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Figures / Tables:

Figure 1 Figure 1: a) Reflected intensity for two opposite magnetization directions (green and purple lines) and corresponding magnetic asymmetry of CoFeB/CoNiO/SiO2 (black line) and. The shaded areas are integrated for each time delay to create the dynamical traces. b) & c) Ultrafast demagnetization and remagnetization dynamics of Co and Fe. Themore » straight lines are exponential guides to the eye. After initially demagnetizing with the same rate and amplitude (b) the remagnetization in Co is much stronger (c). This is due to a stronger exchange field of Co leading to a higher relative magnetization at the same temperature. (d) Typical three temperature calculation for Fe revealing three different time scales during the demagnetization: (Ⅰ) Heating of the spin system by the electrons, (Ⅱ) equilibration between electron spins and phonons, and (Ⅲ) heat exchange with the environment (e.g. the substrate).« less
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    Works referencing / citing this record:

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    • DOI: 10.1088/1367-2630/ab5ac2

    Ultrafast optically induced spin transfer in ferromagnetic alloys
    journal, January 2020

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