The human body is controlled by electrical impulses in,for example, the brain, or the heart and nervous system. These electrical signals create tiny magnetic fields,which doctors could exercise to diagnose various diseases, for example diseases of the brain or heart problems in young foetuses. Researchers from the Niels Bohr Institute have now succeeded in developing a method for extremely precise measurements of such ultra-small magnetic fields with an optical magnetic field sensor. The results are published in the scientific journal, or Scientific Reports.
Source: phys.org