Cross-validation of microfabricated atomic magnetometers with SQUIDs for biomagnetic applications
Svenja A. Knappe, Tillman H. Sander, Olaf Kosch, Frank Wiekhorst, John E. Kitching, Lutz Trahms
A chip-scale atomic magnetometer (CSAM) is compared with a superconducting quantum interference devices (SQUID) sensor in two biomedical applications. CSAMs are magnetic field sensors that operate at room temperature and are based on spectroscopy of alkali atoms in vapor cells with volumes of a few cubic millimeters. Magnetocardiograms (MCGs) of healthy subjects were measured simultaneously by a CSAM and a multichannel SQUID sensor in a magnetically shielded room. The typical features of MCGs are resolved. Furthermore, magnetorelaxometry (MRX) signals of iron nanoparticles were successfully obtained with both sensors.