Abstract
Multilayer amorphous microwires have been prepared coating a precursor FeSiB amorphous nucleus with a crystalline CoNi outer layer. The FeSiB as-cast amorphous wire is characterised by an unique bistable behavior where magnetization reverses from one remanent state to another through a single large Barkhausen event at a field value known as switching field, H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sw</sub> . In multilayer microwires, the presence of a second magnetic phase, a magnetically harder CoNi layer, substantially modifies the values of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sw</sub> via two coupling mechanisms: magnetoelastic and magnetostatic interactions between the two phases. In this paper, a systematic study on the effects of the geometrical characteristic of the outer phase on the H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sw</sub> behavior is presented. M-H analysis and fluctuation studies by induction technique were performed on a family of samples having different CoNi thicknesses.
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