Abstract
The authors propose new methods for reinforcing the large Barkhausen and Matteucci effects in amorphous magnetostrictive wires. Cold-drawn and then torsion-annealed (CDTA) wires (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">77.5</sub> Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7.5</sub> B <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">15</sub> , 50 μm dia.) generate AC voltage pulses ep' (Matteucci voltages) of between 35 and 75 mV across the ends of 200-mm long wires under 2 Oe, 60 Hz external fields. The critical wire length 1* for the large Barkhausen (LB) effect is about 25 mm, facilitating the construction of small-size field sensors. The critical field H* for the LB effect is 0.3 to 0.9 Oe. The value of ep'/l* for the CDTA wires is more than 200 times that of as-prepared 125 μm dia. wires. Magnetoelastic wave propagation characteristics are also remarkably improved in CDTA wires.
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