Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics

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2018
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Hofherr, Moritz
Häuser, Simon
Safonova, Nataliia Y.
Kapteyn, Henry C.
Cinchetti, Mirko
Steil, Daniel
Albrecht, Manfred
Aeschlimann, Martin
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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. Thus, 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.

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ISO 690HOFHERR, Moritz, Simone MORETTI, Simon HÄUSER, Nataliia Y. SAFONOVA, Henry C. KAPTEYN, Mirko CINCHETTI, Daniel STEIL, Manfred ALBRECHT, Ulrich NOWAK, Martin AESCHLIMANN, 2018. Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics. In: Physical Review B. 2018, 98(17), 174419. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.98.174419
BibTex
@article{Hofherr2018-11-14Induc-44508,
  year={2018},
  doi={10.1103/PhysRevB.98.174419},
  title={Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics},
  number={17},
  volume={98},
  issn={2469-9950},
  journal={Physical Review B},
  author={Hofherr, Moritz and Moretti, Simone and Häuser, Simon and Safonova, Nataliia Y. and Kapteyn, Henry C. and Cinchetti, Mirko and Steil, Daniel and Albrecht, Manfred and Nowak, Ulrich and Aeschlimann, Martin},
  note={Article Number: 174419}
}
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