“…Many previous research results have confirmed that maximum MI ratio increases with increasing driving frequency, and then decreases when frequency excesses some a critical value [29,30]. The decrease of MI effect at high frequencies is due to the strong suppression of the domain wall movement by eddy current effect, which causes an extreme decrease of permeability [29,[31][32][33]. As the highest frequency can only reach 1110 kHz under our experimental conditions, we are unable to give full Z/Z(%) max -frequency curves for Co 72 Zr 8 B 20 in the as-quenched state and annealed at 495 • C. In many cases, with increasing frequency the MI effect increases due to involvement of the rotational processes.…”