Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films

Pavel Varlamov
* ,
Anna Semisalova
* ,
Anh Dung Nguyen
,
Michael Farle
ORCID logo ,
Yannis Laplace
,
Michele Raynaud
,
Olivier Noel
,
Paolo Vavassori
ORCID logo ,
Vasily Temnov
*
Version 1 : Received: 20 June 2023 / Approved: 20 June 2023 / Online: 22 June 2023 (10:33:20 CEST)

A peer-reviewed article of this Preprint also exists.

Varlamov, P.; Semisalova, A.; Nguyen, A.D.; Farle, M.; Laplace, Y.; Raynaud, M.; Noel, O.; Vavassori, P.; Temnov, V. Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films. Magnetochemistry 2023, 9, 186, doi:10.3390/magnetochemistry9070186. Varlamov, P.; Semisalova, A.; Nguyen, A.D.; Farle, M.; Laplace, Y.; Raynaud, M.; Noel, O.; Vavassori, P.; Temnov, V. Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films. Magnetochemistry 2023, 9, 186, doi:10.3390/magnetochemistry9070186.

Abstract

Magnetic and morphological properties of equiatomic B2-ordered FeRh thin films irradiated with single high-intensity ultrashort laser pulses are investigated. The goal is to elucidate the effect of femtosecond laser ablation on the magnetic properties of FeRh. We employed Scanning Magneto-Optical Kerr Effect (S-MOKE) microscopy to examine the magnetic phase after laser processing, providing high spatial resolution and sensitivity. Our results revealed the appearance of a magneto-optical signal from the bottom of ablation craters, suggesting a transition from antiferromagnetic to ferromagnetic behavior. Fluence-resolved measurements clearly demonstrate that the ablation threshold coincides with the threshold of the antiferromagnet-to-ferromagnet phase transition. The existence of such magnetic phase transition was independently confirmed by temperature-dependent S-MOKE measurements using a CW laser as a localized heat source. Whereas the initial FeRh film displayed a reversible antiferromagnet-ferromagnet phase transition, the laser-ablated structures exhibited irreversible changes in their magnetic properties. This comprehensive analysis revealed the strong correlation between the femtosecond laser ablation process and the magnetic phase transformation in FeRh thin films.

Keywords

FeRh films; femtosecond laser pulse; laser ablation; S-MOKE microscopy; antiferromagnetism; ferromagnetism

Subject

Physical Sciences, Applied Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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