外部和内部因素对纳米晶合金kHz级饱和磁化过程影响的微磁学分析

doi:10.19595/j.cnki.1000-6753.tces.L80436

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摘要纳米晶合金在kHz级复杂高频饱和工况下的建模问题由于缺乏基础研究而变得愈加突出。基于微磁学模拟软件OOMMF,建立介观尺度下纳米晶合金（Fe_73.5Cu₁Nb₃Si_13.5B₉）的三维模型,计算得到的模型静态磁特性参数与实验测量结果基本吻合,验证了该三维模型的正确性。采用磁矩偏转角速度ω 表征饱和磁化过程中磁矩的进动情况,定量界定“动态饱和”和“静态饱和”两种工况,据此分别探究外部因素（包括附加直流偏置磁场B_d和磁化频率f）和内部因素（即晶粒尺寸d）的不同变化对饱和磁化过程的影响机理。结果表明：对于外部因素,在动态饱和工况下,增大B_d或提高f均对磁矩偏转有加速作用,其中增大B_d的效果更明显;在静态饱和工况下,纳米晶合金的磁化速度已达最大,此时增大B_d或提高f均已不能加速磁矩的偏转。对于内部因素,无论动态还是静态饱和,减小晶粒尺寸均会增大磁矩偏转角速度ω,从而加速纳米晶合金材料的磁化过程。

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	韩智云
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关键词 ：纳米晶合金, 微磁学模拟, 饱和磁化过程, 磁矩偏转, 磁化频率, 直流偏置磁场, 晶粒尺寸

Abstract：The mathematical modeling problem of nanocrystalline alloy under kHz level complex high frequency saturation condition is becoming more and more serious due to the lack of fundamental research. In this paper, a three-dimensional spherical mesoscopic model of nanocrystalline alloy (Fe_73.5Cu₁Nb₃Si_13.5B₉) was established by micromagnetic simulation software OOMMF. The calculated static magnetic characteristic parameters of the model are in good agreement with the experimental results, which validates the correctness of the model. The angular velocity of magnetic moment rotation ω was utilized to indicate the precession of magnetic moment in the process of saturation magnetization. Dynamic saturation and static saturation were both defined quantitatively. Then, the influence mechanism of different changes of external factors (accessional DC bias magnetic field B_d and magnetization frequency f ) and internal factor (grain size d) on saturation magnetization process was investigated. The results indicate that the influence of external and internal factors is different. For external factors, under dynamic saturation conditions, increasing B_d or f both are the effective measures for accelerating magnetic moment rotation, and the effect of increasing B_d is more obvious; under static saturation conditions, increasing B_d or f can no longer accelerate the rotation of the magnetic moment because the nanocrystalline alloy has reached the maximum magnetization speed at that moment. For internal factor, whether under dynamic or static saturation conditions, reducing the grain size will increase the angular moment of magnetic moment rotation of the nanocrystalline alloy, which can accelerate the magnetization process of the nanocrystalline alloy material.

Key words： Nanocrystalline alloy micromagnetic simulation saturation magnetization process magnetic moment rotation magnetization frequency DC bias magnetic field grain size

收稿日期: 2018-07-01 出版日期: 2019-05-05

PACS:

TM274

基金资助:国家自然科学基金资助项目（51307102）

通讯作者: 邹亮男,1983年生,博士,副教授,研究方向为高电压与绝缘技术、应用电磁学等。E-mail: zouliang@sdu.edu.cn

作者简介: 韩智云男,1995年生,硕士研究生,研究方向为高压电磁装备磁化建模、分子模拟与绝缘材料设计。E-mail: hanzhiyun1995@163.com

引用本文:

韩智云, 邹亮, 伍珈乐, 张黎, 赵彤. 外部和内部因素对纳米晶合金kHz级饱和磁化过程影响的微磁学分析[J]. 电工技术学报, 2019, 34(8): 1589-1598. Han Zhiyun, Zou Liang, Wu Jiale, Zhang Li, Zhao Tong. Micromagnetic Analysis of External and Internal Impact Factors on kHz Level Saturation Magnetization for Nanocrystalline Alloy. Transactions of China Electrotechnical Society, 2019, 34(8): 1589-1598.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.L80436 https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I8/1589

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