Element‐specific Magnetization Damping in Ferrimagnetic DyCo5 Alloys Revealed by Ultrafast X‐ray Measurements

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2021
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Abrudan, Radu
Hennecke, Martin
Radu, Florin
Kachel, Torsten
Holldack, Karsten
Mitzner, Rolf
Khmelevskyi, Sergii
Radu, Ilie
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The dynamic response of magnetically‐ordered materials to an ultrashort external stimulus depends on microscopic parameters such as magnetic moment, exchange and spin‐orbit interactions. Whereas it is well established that, in multi‐component magnetic alloys and compounds, the speed of demagnetization and spin switching processes has an element‐specific character, the magnetization damping has been assumed to be a universal parameter for all constituent magnetic elements irrespective of their different spin‐orbit couplings and electronic structure. Here, we provide experimental and theoretical evidence for an element‐specific magnetic damping parameter by investigating the ultrafast magnetization response of a high‐anisotropy ferrimagnetic DyCo5 alloy to femtosecond laser excitation. Employing femtosecond laser pump – X‐ray magnetic circular dichroism (XMCD) probe measurements combined with atomistic spin dynamics (ASD) simulations using ab‐initio calculated parameters we reveal a strikingly different demagnetization and remagnetization dynamics of the Dy and Co magnetic moments upon photo‐excitation. These observations, fully corroborated by the ASD simulations, are linked to the element‐specific spin‐orbit coupling strengths of Dy and Co, which are incorporated in the phenomenological magnetization damping parameters. Our findings can be used as a recipe for tuning the speed and magnitude of laser‐driven magnetic processes and consequently allowing to control various dynamic functionalities in multi‐component magnetic materials.

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530 Physik
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ultrafast magnetism, femtosecond X-ray spectroscopy, magnetization damping, ferrimagnets, atomistic spin dynamics simulations
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ISO 690ABRUDAN, Radu, Martin HENNECKE, Florin RADU, Torsten KACHEL, Karsten HOLLDACK, Rolf MITZNER, Andreas DONGES, Sergii KHMELEVSKYI, Ulrich NOWAK, Ilie RADU, 2021. Element‐specific Magnetization Damping in Ferrimagnetic DyCo5 Alloys Revealed by Ultrafast X‐ray Measurements. In: physica status solidi (RRL) – Rapid Research Letters. Wiley-Blackwell - STM. 2021, 15(8), pp. 2100047. ISSN 1862-6254. eISSN 1862-6270. Available under: doi: 10.1002/pssr.202100047
BibTex
@article{Abrudan2021-08Eleme-53416,
  year={2021},
  doi={10.1002/pssr.202100047},
  title={Element‐specific Magnetization Damping in Ferrimagnetic DyCo<sub>5</sub> Alloys Revealed by Ultrafast X‐ray Measurements},
  number={8},
  volume={15},
  issn={1862-6254},
  journal={physica status solidi (RRL) – Rapid Research Letters},
  author={Abrudan, Radu and Hennecke, Martin and Radu, Florin and Kachel, Torsten and Holldack, Karsten and Mitzner, Rolf and Donges, Andreas and Khmelevskyi, Sergii and Nowak, Ulrich and Radu, Ilie}
}
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