Three-channel non-force magnetic microscope

The development of a scanning magnetic microscope (MM) without appreciable applied forces or magnetic excitations on specimens is presented. The magnetic microscope is intended to measure weak magnetic field distributions near the object surface at micron and sub-micron scales. Specifically, the MM consists of three measurement units with respective output channels. The first channel uses a special fluxgate magnetometer as a field detector, and is designed for magnetic study of a specimen surface at room temperature (T=300K), with a magnetic sensitivity of 10(-9)T, at a spatial resolution of 10mum in a scan area of 10x10 mm. The second channel uses a HTSC SQUID and a ferromagnetic flux concentrator, and is intended for detailed study of a room-temperature object at the sensitivity of 10(-12) T with 0.1-1 mum resolutions. The third component also uses the SQUID-concentrator combination, but is intended for detailed study of the object at liquid-nitrogen temperature (T=77 K), covering the area of 100x100mum.