Enhancing Delta E Effect at High Temperatures of Galfenol/Ti/Single-Crystal Diamond Resonators for Magnetic Sensing
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2020-04-27 |
| Journal | ACS Applied Materials & Interfaces |
| Authors | Zilong Zhang, Haihua Wu, Liwen Sang, Y. K. Takahashi, Jian Huang |
| Institutions | Shanghai University, National Institute for Materials Science |
| Citations | 41 |
Abstract
Section titled âAbstractâA conventional wisdom is that the sensing properties of magnetic sensors at high temperatures will be degraded due to the materialsâ deterioration. Here, the concept of high-temperature enhancing magnetic sensing is proposed based on the hybrid structure of SCD MEMS resonator functionalized with a high thermal-stable ferromagnetic galfenol (FeGa) film. The delta <i>E</i> effect of the magnetostrictive FeGa thin film on Ti/SCD cantilevers is investigated by varying the operating temperature from 300 to 773 K upon external magnetic fields. The multilayer structure magnetic sensor presents a high sensitivity of 71.1 Hz/mT and a low noise level of 10 nT/âHz at 773 K for frequencies higher than 7.5 kHz. The high-temperature magnetic sensing performance exceeds those of the reported magnetic sensors. Furthermore, an anomalous behavior is observed on the delta <i>E</i> effect, which exhibits a positive temperature dependence with the law of <i>T</i><sup><i>n</i></sup>. Based on the resonance frequency shift of the FeGa/Ti/SCD cantilever, the strain coupling in the multilayers of the FeGa/Ti/SCD structure under a magnetic field is strengthened with increasing temperature. The delta <i>E</i> effect shows a strong relationship with the azimuthal angle, θ, as a sine function at 300 and 773 K. This work provides a strategy to develop magnetic sensors for high-temperature applications with performance superior to that of the present ones.