石墨烯
磁致伸缩
材料科学
磁场
谐振器
基质(水族馆)
灵敏度(控制系统)
联轴节(管道)
光电子学
共振(粒子物理)
压力(语言学)
纳米技术
复合材料
电子工程
物理
语言学
海洋学
哲学
粒子物理学
量子力学
地质学
工程类
作者
Wenyao Liu,Wei Li,Chenxi Liu,Enbo Xing,Yanru Zhou,Lai Liu,Jun Tang
摘要
This paper presents a novel resonant magnetic sensor consisting of a graphene nanomechanical oscillator and magnetostrictive stress coupling structure, using Si/SiO2 substrate and Fe-Ga alloy, respectively. In this device, the deformation of the Fe-Ga alloy resulting from the external magnetic field changed the surface tension of the graphene, resulting in a significant change in the resonance frequency of graphene. Using the finite element analysis, it could be found that the response of the resonance frequency revealed a good linear relationship with the external magnetic field (along the x-axis) in the range of the 1 to 1.6 mT. By optimizing the sizes of each component of the magnetic sensor, such as the thickness of the Si/SiO2 substrate and the Fe-Ga alloy, and the length of the graphene, the sensitivity could even reach 834 kHz/mT, which is three orders of magnitude higher than conventional resonant magnetic devices. This provides a new method for highly sensitive and miniaturized magnetic sensors.
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