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

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-07-18 DOI:10.3390/magnetochemistry9070186

P. Varlamov, A. Semisalova, Anh Dung Nguyen, M. Farle, Y. Laplace, M. Raynaud, O. Noel, P. Vavassori, V. Temnov

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Abstract

In this study, we present a novel investigation into the magnetic and morphological properties of equiatomic B2-ordered FeRh thin films irradiated with single high-intensity ultrashort laser pulses. 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 for the first time demonstrated 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 a 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.

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FeRh薄膜中飞秒激光烧蚀诱导的磁相变

在这项研究中，我们提出了一种新的研究在单次高强度超短激光脉冲照射下等原子b2有序FeRh薄膜的磁性和形态学性质。目的是阐明飞秒激光烧蚀对FeRh磁性能的影响。我们采用扫描磁光克尔效应(S-MOKE)显微镜对激光处理后的磁相进行检测，具有较高的空间分辨率和灵敏度。我们的结果首次证明了从烧蚀陨石坑底部出现的磁光信号，表明从反铁磁到铁磁行为的转变。通量分辨测量清楚地表明，烧蚀阈值与反铁磁体到铁磁体相变的阈值一致。这种磁相变的存在是通过使用连续波激光作为局部热源的温度依赖S-MOKE测量独立证实的。而初始的FeRh薄膜表现出可逆的反铁磁-铁磁体相变，激光烧蚀结构表现出不可逆的磁性变化。这一综合分析揭示了飞秒激光烧蚀过程与FeRh薄膜的磁相变之间有很强的相关性。

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.