Fringing electric and magnetic field sensors are widely used for non-destructive measurements of material properties. A simple conventional fringing field sensor consists of a sensor head, a current or voltage source, an impedance measurement circuit, and data processing/data acquisition capability. The sensor head is usually a patterned array of electrodes or windings on an electrically insula...

We have developed a scanning superconducting quantum interference device sSQUIDd microscope system with interchangeable sensor configurations for imaging magnetic fields of room-temperature sRTd samples with submillimeter resolution. The low-critical-temperature sTcd niobium-based monolithic SQUID sensors are mounted on the tip of a sapphire and thermally anchored to the helium reservoir. A 25 ...