High sensitivity magnetometer using nanocomposite polymers with large magneto-optic response

Babak Amirsolaimani, Palash Gangopadhyay, Andre P. Persoons, Sasaan A. Showghi, Lloyd J. Lacomb, Robert A. Norwood, Nasser Peyghambarian

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Miniaturized magnetic field sensors are increasingly used in various applications, such as geophysical exploration for minerals and oil, volcanology, earthquake studies, and biomedical imaging. Existing magnetometers lack either the spatial or the temporal resolution or are restricted to costly shielded labs and cannot operate in an unshielded environment. Increasing spatio-temporal resolution would allow for real-time measurements of magnetic fluctuations with high resolution. Here we report on a new nanocomposite-based system for miniaturized magnetic field sensing. The sensor is based on Dy3-doped magnetite and cobalt ferrite nanoparticles dispersed in a polymer matrix. Operation is feasible at room temperature and in an unshielded environment. A compact fiber-optic interferometer is used as the detection mechanism with 20 fT∕pHz sensitivity. We investigated the magnetic field response of the sensor and demonstrated the measurement of the human heartbeat as a potential application.

Original languageEnglish (US)
Pages (from-to)4615-4618
Number of pages4
JournalOptics letters
Issue number19
StatePublished - Oct 1 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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