Abstract
In the magneto-inductive effect (MI effect), the inductance L of a ferromagnetic wire element magnetized by an ac current I ac in the wire is changed by an external magnetic field H ex . When the current I ac is passed through the wire, a voltage e tot is induced across the wire ends. The voltage has two components: a voltage e R due to R w I ac (where R w is the electrical resistance of the wire), and a voltage e L equal to d? ? /dt (where ? ? is the circumferential flux in the wire cross-section). e L is detected by subtracting e R from e tot using a simple resistor circuit. The amplitude |e L | of e L decreases with decreases in L caused by increases in |H ex |. That is, e L is amplitude-modulated by |H ex |. The waveform of |H ex | is detected using a simple demodulator based on a diode and capacitor. A sensitive MI element is created by using a slightly negative magnetostrictive amorphous wire of length 2 mm and diameter 50 ?m, without a coil. This MI element is expected to find applications in sensitive magnetic heads for accurate rotary encoders, in rigid disk drives, and in various magnetic cards.
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