Linearly shifting ferromagnetic resonance response of La_0.7Sr_0.3MnO₃ thin film for body temperature sensors

Abstract

Human body temperature not only reflects vital signs, but also affects the state of various organs through blood circulation, and even affects lifespan. Here a wireless body temperature detection scheme was presented that the temperature was extracted by investigating the out-of-plane (OP) ferromagnetic resonance (FMR) field of 10.2 nm thick La_0.7Sr_0.3MnO₃ (LSMO) film using electron paramagnetic resonance (EPR) technique. Within the range of 34–42 °C, the OP FMR field changes linearly with the increasing or decreasing temperature, and this variation comes from the linear responses of magnetization to the fluctuant temperature. Using this method, a tiny temperature change (<0.1 °C) of organisms can be detected accurately and sensitively, which shows great potential in body temperature monitoring for humans and mammals.

Graphical abstract

Keywords

body temperature / ferromagnetic resonance / La_0.7Sr_0.3MnO₃ film / linear response

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Disclosure of potential conflicts of interest

The authors declare that they have no conflict of interest.

Acknowledgements

This work was supported by the Doctoral Startup Foundation of Taiyuan University of Science and Technology (Grant No. 20202042), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (Grant No. 2021L303), the Excellent Doctoral Foundation of Shanxi Province (Grant No. 20212044), the National Key R&D Program of China (Grant No. 2018YFB0407601), the National Natural Science Foundation of China (Grant Nos. 11534015, 51602244 and 11804266), the National 111 Project of China (Grant No. B14040), and the Fundamental Research Funds for the Central Universities (Grant No. xzy022019069).

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