Abstract
We have been investigating biomagnetic field measurements using magnetoresistive (MR) device-based flux sensors since 2014. The MR device is based on the same technology as the magnetic heads of hard disk drives and provides a compact, affordable, and cryogen-free biomagnetic measurement system. The sensitivity of the sensor is expanded by a flux concentrator made of high-permeability material, and the magnetic field resolution of the sensor is several picotesla at 1 Hz. Magnetocardiographic signals and signals from neural activities were successfully obtained using sensor arrays composed of MR device-based flux sensors.
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Adachi, Y., Kawabata, S., Tatsuoka, T., Terazono, Y. (2022). Emerging MR Sensors for Biomagnetic Measurements. In: Labyt, E., Sander, T., Wakai, R. (eds) Flexible High Performance Magnetic Field Sensors. Springer, Cham. https://doi.org/10.1007/978-3-031-05363-4_16
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