材料科学
微波食品加热
吸收(声学)
锥面
制作
纳米结构
超材料
共振(粒子物理)
各向异性
凝聚态物理
光学
光电子学
纳米技术
原子物理学
复合材料
物理
替代医学
量子力学
病理
医学
作者
Wanling Zhang,Jiaming Zhang,Peng Wu,Guozhi Chai,Ran Huang,Fei Ma,Fangfang Xu,Hongwei Cheng,Yonghui Chen,Xia Ni,Liang Qiao,Jinglai Duan
标识
DOI:10.1021/acsami.0c04247
摘要
Magnetic nanostructures with conical shape are highly desired for pursuing extraordinary magnetic properties and microwave absorption. However, the fabrication of such nanostructures with controlled shape and size uniformities and alignment is not yet realized. Accordingly, the magnetic properties and their application as microwave absorber are not well understood. Here, we report on the first demonstration of controlled fabrication of soft magnetic nickel nanocone arrays with sharp geometry, large aspect ratio, uniform size, and parallel alignment. The imaginary part of the relative complex permeability shows multiband absorption in the 2-17 GHz range. Such an exceptional microwave absorption results from the uniform conical shape and size and the parallel alignment. The absorption mechanisms are discussed under the framework of natural resonance and exchange resonance. The natural resonance is dependent on the shape anisotropy and facilitated by the conical geometry. The exchange resonance is well explained by the observation of the bulk spin waves with exchange coupling at the tip of nanocones using the inelastic light scattering and is consistent with exchange theory predictions for the quantization of bulk spin waves. We expect that our work will shed light on the physical insights into the magnetic properties of nanocones and find great potential in applications of microwave absorption.
科研通智能强力驱动
Strongly Powered by AbleSci AI