DENSITY OF MAGNETIC POLES IN AMORPHOUS FERROMAGNETIC WIRES - AN EXAMPLE OF WEAK CHAOS

While a single piece of Fe-base amorphous wire is well known to exhibi t square hysteresis loop, it is experimentally shown here that when pl acing a set of n quasi-identical amorphous Fe-base wire its hysteresis loop consists of n large Barkhausen jumps separated by (n - I) horizo ntal stretches. This kind of loop is interpreted as arising from the m agnetic interaction among wires. Each wire is considered to have a par ticular density of magnetic poles at the ends creating an additional f ield at its neighborhood. Such a density arises from the closure domai n structure at the ends which is slightly modified after each reversal . These magnetic interactions are analyzed and proven to induce a weak chaotic behavior for the switching field of each single wire. (C) 199 7 American Institute of Physics.