Linearly shifting ferromagnetic resonance response of La0.7Sr0.3MnO3 thin film for body temperature sensors
Weixiao HOU1, Yufei YAO2, Yaojin LI2, Bin PENG2, Keqing SHI3, Ziyao ZHOU2, Jingye PAN3(), Ming LIU2(), Jifan HU1()
1. Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province, College of Material Science and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China 2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering State Key Laboratory for Mechanical Behavior of Materials and International Joint Laboratory for Micro/Nano Manufacture and Measurement Technology, Xi’an Jiaotong University, Xi’an 710049, China 3. Department of Intensive Care, Precision Medicine Center Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
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 La0.7Sr0.3MnO3 (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.
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