Developing Laser-Assisted Heating Magnetization Utilizing a Distributed External Magnetic Field for Magnetic MEMS

IF 1.6 4区物理与天体物理 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Magnetics Letters Pub Date : 2026-01-12 DOI:10.1109/LMAG.2026.3652483

Keita Nagai;Tadahiko Shinshi

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引用次数: 0

Abstract

Self-demagnetizing fields in uniformly magnetized flat magnets limit the surface magnetic flux density and output power of magnetic microelectromechanical systems (MEMSs). In laser-assisted heating magnetization (LAHM), the laser locally reduces the coercivity, and a uniform reverse magnetic field subsequently reverses the magnetization. LAHM was developed to produce fine multipole patterns and address these performance limitations. This study extends LAHM by superimposing a distributed external magnetic field tailored to the target pattern. The field is generated by a prepatterned multipole master NdFeB magnet (

$B_{r}$

= 1.30 T and

$H_{cj}$

= 2388 kA/m) placed on a uniform reverse-field source, which strengthens the local magnetizing field in the target areas and attenuates it elsewhere. Experiments employing 0.3 mm thick NdFeB samples demonstrate that distributed-field LAHM increases the magnetization ratio by 10.8% and the peak-to-peak surface magnetic flux density by 54.2 mT compared with conventional uniform-field LAHM. These results indicate a potential route to higher performance multipole magnets for MEMS applications.

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基于分布式外磁场的磁性微机电系统激光辅助加热磁化研究

均匀磁化的扁平磁体中的自退磁场限制了磁性微机电系统的表面磁通密度和输出功率。在激光辅助加热磁化（LAHM）中，激光局部降低矫顽力，均匀的反向磁场随后反转磁化。LAHM的开发是为了产生精细的多极图案，并解决这些性能限制。这项研究通过叠加一个适合目标模式的分布式外部磁场来扩展LAHM。在均匀的反场源上放置一个预图案的多极主钕铁硼磁体（$B_{r}$ = 1.30 T, $H_{cj}$ = 2388 kA/m），产生磁场，增强目标区域的局部磁场，减弱其他区域的局部磁场。采用0.3 mm厚钕铁硼试样进行的实验表明，与常规均匀场LAHM相比，分布场LAHM的磁化比提高了10.8%，峰值表面磁通密度提高了54.2 mT。这些结果表明了用于MEMS应用的高性能多极磁体的潜在途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Magnetics Letters PHYSICS, APPLIED-

CiteScore

2.40

自引率

0.00%

发文量

期刊介绍： IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics. IEEE Magnetics Letters publishes short, scholarly articles of substantial current interest. IEEE Magnetics Letters is a hybrid Open Access (OA) journal. For a fee, authors have the option making their articles freely available to all, including non-subscribers. OA articles are identified as Open Access.