Ferromagnetic nanocomposites as spintronic materials with controlled magnetic structure

The physical properties of ferromagnetic dilute magnetic semiconductors and nanocomposites are considered. The latter have several advantages as spintronic materials with a controlled magnetic structure for weak magnetic field sensors. A characteristic feature of ferromagnetic nanocomposites is the spin dependent tunneling conductance, which is responsible for negative and positive magnetoresistance. The magnetoresistive effects have a wide range of applications. In particular, materials with such effects may be used in the development of magnetoresistive memory devices, weak magnetic field sensors, medical diagnostic devices and other items of electronic equipment.