agnetoinductance and giant magnetoimpedance (GMI) sensors have greatly benefited from the development of amorphous wires. These soft ferromagnetic substances exhibit exquisite sensitivity (in the nT range) and wide bandwidth (MHz) in thin film structures. Combining these properties with surface wave technology produces passive, wireless sensors. Magnetoinductance Magnetoinductive effects in ferromagnetic conductors can be used for various sensors. Hans Christian Orsted of Denmark discovered the principles of magnetoinductance in 1820. He found that whenever electricity flows through a wire, a magnetic field is produced around the wire. This produces magnetization in the conductor called magnetoinductance. If the current varies with time, then the magnetic flux in the conductor also varies and induces an electromotive force between the ends of the conductor that is superimposed on the ohmic voltage. In a wire with a circular cross section, the circumferential magnetic field, H, induced by a constant current with the density, j,

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