题目：Modeling Barkhausen Noise through Viscoelastic Domain Wall Dynamics and Universal Magnetization Behavior（基于粘弹性磁畴壁动力学与普适磁化行为的巴克豪森噪声建模）

时间：2026年8月18日（周二） 下午 15:30-17:00

地点：清华大学西主楼2-308会议室

邀请人：彭丽莎

讲座简介

Barkhausen noise provides a unique window into the irreversible dynamics of magnetic domain walls and the underlying microstructure of ferromagnetic materials. This presentation introduces a physics-based framework that bridges the motion of an individual domain wall with the collective magnetization behavior of a ferromagnet. Starting from the simulation of a single domain wall interacting with pinning sites, we demonstrate how the cumulative response of many domain walls naturally reconstructs the characteristic Barkhausen noise activity and the associated Barkhausen noise energy hysteresis. To capture the experimentally observed dynamic behavior, viscoelasticity is incorporated into both domain-wall motion and the macroscopic magnetization process via a fractional-order formulation. This approach accurately reproduces the time-dependent response while revealing the remarkable universality of key dynamic parameters, including the characteristic time constant governing domain wall motion and the fractional order describing magnetic viscoelasticity. These findings suggest that the dynamic magnetization behavior of a wide range of ferromagnetic materials can be described within a unified framework, providing new insights into Barkhausen noise generation and opening new perspectives for quantitative magnetic nondestructive evaluation.

巴克豪森噪声为研究铁磁材料磁畴壁不可逆动力学及其微观结构提供了一个独特的窗口。本报告将介绍一种基于物理的框架，将单个磁畴壁的运动与铁磁体的集体磁化行为联系起来。从模拟单个磁畴壁与钉扎中心的相互作用出发，我们展示了多个磁畴壁的累积响应如何自然地重建出特征性的巴克豪森噪声活动以及相关的巴克豪森噪声能量滞回。为了捕捉实验观察到的动态行为，通过分数阶公式将粘弹性引入磁畴壁运动和宏观磁化过程中。该方法准确地再现了时间依赖响应，同时揭示了关键动态参数的显著普适性，包括控制磁畴壁运动的特性时间常数和描述磁粘弹性的分数阶。这些发现表明，广泛铁磁材料的动态磁化行为可以在一个统一的框架内得到描述，从而为巴克豪森噪声的产生提供了新的见解，并为定量磁无损评估开辟了新的视角。

嘉宾简介

Benjamin Ducharne received his M.S. degree in Electrical Engineering from the University Claude Bernard Lyon 1 (France) in 2001 and his Ph.D. in 2003. After a postdoctoral appointment at the Montefiore Institute, University of Liège (Belgium), in 2004, he joined INSA Lyon as an Associate Professor in 2005. During 2018–2019, he was a visiting scholar and mid-term lecturer at Purdue University (Indiana, USA). Since 2020, he has been a Full Researcher at Tohoku University, Japan and INSA Lyon - GE - LGEF, Villeurbanne, France. His research focuses on magnetic nondestructive testing, ferromagnetic and ferroelectric materials, hysteresis modeling, fractional-order systems, and multiphysics coupling.

Benjamin Ducharne 于 2001 年获得法国里昂第一大学电气工程硕士学位，并于 2003 年获得博士学位。2004 年在比利时列日大学从事博士后研究后，他于 2005 年加入法国国立应用科学学院里昂分校（INSA Lyon）担任副教授。2018 年至 2019 年期间，他曾在美国印第安纳州普渡大学担任访问学者和中期讲师。自 2020 年起，他担任日本东北大学和法国INSA Lyon - GE - LGEF 的正研究员。他的研究重点包括：磁无损检测、铁磁与铁电材料、磁滞建模、分数阶系统以及多物理场耦合。