Laser and thermal control over structure and magnetic properties of PrDy-FeCo-B microwires

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2024-10-03 DOI:10.1016/j.jmmm.2024.172574

Elizaveta Dvoretskaya , Roman Morgunov , Valery Savin , Alexander Chernov

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Abstract

Magnetic microcombs are necessary in microrobotics, MEMS technologies, actuator and magnetic flow analyzer industries. Usually, magnetic microcombs are artificial linear magnets of periodic shape. We propose another type of microcombs based of microwires, where periodicity of magnetization is caused by equidistant alternation of natural domains. We have demonstrated the presence of quasi-periodic radial magnetization and the effect of temperature and magnetic field on magnetic relief in PrDyFeCoB microwires. Accurate analysis of chemical, phase and structural composition of the microwires allowed us to reveal necessary conditions for the creation of periodical magnetic relief. Annealing affects magnetic relief and changes structure of initially amorphous microwires. Crystal structure of inclusions enriched with Fe and Co instead of Dy and Pr is body-centered cubic (BCC), while the bulk of the microwire has tetragonal structure. We have found laser stimulated amorphization of surface of PrDy-FeCo-B microwires. Partial restoration of the amorphous structure in polycrystalline microwires under single laser pulse of irradiation of 1mJ power and 120 ns duration has been found in 1–2 μm depth.

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激光和热控制 PrDy-FeCo-B 微线的结构和磁性能

在微机器人、微机电系统技术、致动器和磁流体分析仪等行业中，磁性微蜂窝是必不可少的。通常，磁性微蜂窝是周期性形状的人工线性磁体。我们提出了另一种基于微线的微蜂窝，其磁化周期性是由自然畴的等距交替引起的。我们已经证明了准周期径向磁化的存在，以及温度和磁场对 PrDyFeCoB 微线磁性浮雕的影响。通过对微线的化学、相和结构组成进行精确分析，我们揭示了产生周期性磁浮的必要条件。退火会影响磁性浮雕并改变最初无定形微线的结构。富含铁和钴而不是镝和镨的夹杂物的晶体结构是体心立方（BCC），而微线的主体是四方结构。我们发现，PrDy-FeCo-B 微线的表面受激光刺激发生了非晶化。在 1-2 μm 的深度内，在 1mJ 功率和 120 ns 持续时间的单激光脉冲照射下，多晶微线的非晶结构得到了部分恢复。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.