Optical Creation of Skyrmions by Spin Reorientation Transition in Ferrimagnetic CoHo Alloys - Archive ouverte HAL
Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2023

Optical Creation of Skyrmions by Spin Reorientation Transition in Ferrimagnetic CoHo Alloys

Tian Xun Huang
  • Fonction : Auteur
  • PersonId : 1159445
Michel Hehn
Grégory Malinowski
Maxime Vergès
Julius Hohlfeld
Quentin Remy
Daniel Lacour
Xin Ran Wang
  • Fonction : Auteur
Guo Ping Zhao
Pierre Vallobra
Yong Xu
  • Fonction : Auteur correspondant
  • PersonId : 1159446

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Stéphane Mangin
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Wei Sheng Zhao

Résumé

Manipulating magnetic skyrmions by means of a femtosecond (fs) laser pulse has attracted great interest due to their promising applications in efficient information-storage devices with ultralow energy consumption. However, the mechanism underlying the creation of skyrmions induced by an fs laser is still lacking. As a result, a key challenge is to reveal the pathway for the massive reorientation of magnetization from trivial to nontrivial topological states. Here, we studied a series of ferrimagnetic CoHo alloys and investigated the effect of a single laser pulse on the magnetic states. Thanks to the time-resolved magneto-optical Kerr effect and imaging techniques, we demonstrate that the laser-induced phase transitions from single domains into a topological skyrmion phase are mediated by the transient in-plane magnetization state, in real time and space domains, respectively. Combining experiments and micromagnetic simulations, we propose a two-step process for creating skyrmions through laser pulse irradiation: (i) the electron temperature enhancement induces a spin reorientation transition on a picosecond (ps) timescale due to the suppression of perpendicular magnetic anisotropy (PMA) and (ii) the PMA slowly restores, accompanied by out-of-plane magnetization recovery, leading to the generation of skyrmions with the help of spin fluctuations. This work provides a route to control skyrmion patterns using an fs laser, thereby establishing the foundation for further exploration of topological magnetism at ultrafast timescales
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Dates et versions

hal-04244308 , version 1 (01-08-2024)

Identifiants

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Wei Zhang, Tian Xun Huang, Michel Hehn, Grégory Malinowski, Maxime Vergès, et al.. Optical Creation of Skyrmions by Spin Reorientation Transition in Ferrimagnetic CoHo Alloys. ACS Applied Materials & Interfaces, 2023, 15 (4), pp.5608-5619. ⟨10.1021/acsami.2c19411⟩. ⟨hal-04244308⟩
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