Effect of annealing on generation of magnetoelastic waves in amorphous wires, and their application.

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Abstract
The effect of annealing on the generation and detection characteristics of magnetoelastic waves (MEWs) is studied in Fe77.5Si7.5B15 amorphous wires. Annealing after wire-drawing is found to be exceedingly effective in improving the efficiency in a high frequency region. The wire-drawing is indispensable to get rid of inhornogeneities which may scatter the high frequency MEWs. The annealing is necessary to soften a magnetic hardness arising from the wiredrawing. It is found that a partial annealing develops a highly sensitive small region to a driving magnetic field in the sample wire which is made insensitive to the driving field by a wire drawing. This small region serves as an excellent source which is preferable to generate high frequency MEWs.

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