Double large Barkhausen jump in soft/soft composite microwires

G Infante (1) , G A Badini-Confalonieri (1) , R P del Real (1) , M Vázquez (1)

1 ICMM - Instituto de Ciencia de Materiales de Madrid

The magnetic properties of double layer microwires consisting of a soft FeSiBP amorphous core, an intermediate non-magnetic glass spacer, and a softer FeNi outer shell have been investigated. As in the case of other magnetostatically coupled two-phase systems, the hysteresis loops are characterized by two well-defined Barkhausen jumps corresponding each to the magnetization reversal of the individual phases, separated by a plateau. The strong dipolar interaction that leads to the appearance of the plateau is investigated in terms of the microwire geometry. It is shown that this source of coupling is capable of increasing up to one order of magnitude the switching field of the Fe-rich core. Thus, magnetic bistability can be effectively controlled in this kind of composite wires.

Mots clés: : 75.50.Bb; 75.50.Kj; 75.60.Jk; 75.60.Nt; 81.40.Rs

G Infante, G A Badini-Confalonieri, R P del Real, M Vázquez. Double large Barkhausen jump in soft/soft composite microwires. Journal of Physics D: Applied Physics, 2010, 43 (34), pp.345002. ⟨10.1088/0022-3727/43/34/345002⟩. ⟨hal-00569682⟩