학술논문
Low Noise, Strain Modulated, Multiferroic Magnetic Field Sensor Systems
Document Type
Periodical
Author
Source
IEEE Sensors Journal IEEE Sensors J. Sensors Journal, IEEE. 23(13):14025-14040 Jul, 2023
Subject
Language
ISSN
1530-437X
1558-1748
2379-9153
1558-1748
2379-9153
Abstract
Low noise sensors with low power consumption are needed for sensing the biomagnetic potentials produced by the human body. Compared to their electrical counterparts, biomagnetic sensors are noninvasive and noncontact. A strain-modulated FeCo-Hf/AlScN-based sensor with a bandwidth of 3.4 kHz and a magnetic noise spectral density at 1 kHz of 59.5 pT/ $\surd $ Hz before demodulation and 98.5 pT/ $\surd $ Hz after demodulation in an unshielded environment is presented. The footprint of the sensor including flux concentrators is 0.125 cm 2 , and the total power consumption of the printed circuit board (PCB)-based readout electronics is 440 mW. A theoretical analysis for the scaling of the sensitivity and the noise spectral density of modulated multiferroic sensor systems is presented.