Theoretical Concept Describing a Use of Magnetic Nanoparticles in a Thin Elastic Film for the Detection of Mechanical Deformation,Physica Status Solidi (B) - Basic Solid State Physics

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Theoretical Concept Describing a Use of Magnetic Nanoparticles in a Thin Elastic Film for the Detection of Mechanical Deformation
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-08-04 , DOI: 10.1002/pssb.202100162
Krzysztof K. Dudek ₁ , Maciej Marć ₁ , Wiktor Wolak ₁ , Andrzej Drzewiński ₁ , Mirosław R. Dudek ₁

Affiliation

Herein the effect is analyzed that magnetic dipole interactions have on the heating process of single-domain magnetic nanoparticles subjected to an external radiofrequency (RF) magnetic field, where the magnetic nanoparticles are densely packed in a thin elastic film. To analyze this effect, the considered thin film is subjected to mechanical deformation, which causes the displacement of nanoparticles and affects magnetic dipole interactions between them. As a consequence, at different stages of the mechanical deformation, the film shows different heating powers of the magnetic nanoparticles. To investigate this effect, a theoretical model describing the considered nanoparticle system exposed to the RF magnetic field is proposed, where the heating power of the film is discussed in terms of the specific absorption rates (SARs). Through the use of this model, it is shown that the considered stretchable magnetic film can sense mechanical deformation in the presence of the uniform RF magnetic field both in the direction perpendicular to the film and in the loading direction. Thus, the concept proposed in this study can be utilized in the design of a sensor that would be particularly interesting in the case of medical applications for diagnostic purposes.

中文翻译：

描述在弹性薄膜中使用磁性纳米粒子检测机械变形的理论概念

本文分析了磁偶极子相互作用对受外部射频 (RF) 磁场影响的单畴磁性纳米粒子的加热过程的影响，其中磁性纳米粒子密集地堆积在弹性薄膜中。为了分析这种影响，所考虑的薄膜受到机械变形，这会导致纳米颗粒的位移并影响它们之间的磁偶极相互作用。因此，在机械变形的不同阶段，薄膜显示出磁性纳米粒子的不同加热功率。为了研究这种效应，提出了一个描述所考虑的暴露于 RF 磁场的纳米粒子系统的理论模型，其中根据比吸收率 (SAR) 讨论了薄膜的加热功率。通过使用该模型，表明在垂直于薄膜的方向和加载方向上，在存在均匀射频磁场的情况下，所考虑的可拉伸磁性薄膜可以感知机械变形。因此，本研究中提出的概念可用于传感器的设计，这在用于诊断目的的医疗应用中特别有趣。

更新日期：2021-10-09

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