Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.35848/1882-0786/abf66a
Keywords
MTJ; Sensor; Geomagnetic pulsation
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Funding
- KANENHI [18H01685, 19K22031]
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The study found that reducing the cutoff frequency of a TMR magnetometer is a promising approach for detecting field oscillations occurring over long periods, such as 100 s, even though it may reduce the detectable intensity.
We investigated the appropriateness of a tunneling magnetoresistance (TMR)-based magnetometer for detecting geomagnetic fields with long-period oscillations through observation of the geomagnetic pulsation (Pi). Pi was not sufficiently observed in the raw outputs due to thermal noise; a bandwidth-limitation treatment helped extract Pi without data stacking. The detectable intensity was reduced to 1 nT with a period of 30 s, but detection was impossible for 100 s. The frequency characteristics revealed that reducing the cutoff frequency of a TMR magnetometer is a promising approach for detecting field oscillations occurring over long periods, such as 100 s.
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