Iron alloys Magnetic properties Microstructure Niobium compounds Amorphous matrix Magnetoimpedance effects Nanocomposite structure Nanocomposites
Issue Date:
2007
Publisher:
Physica Status Solidi (A) Applications and Materials
Citation:
Volume: 204, Issue: 12, Page : 4113-4116
Abstract:
The influence of Nb substituted for Fe on the microstructure and magnetic properties including the
magnetoimpedance effect of a Fe-based have been investigated. The nanocomposite structure composed of
ultra-fine Fe(Si) grains embedded in an amorphous matrix was obtained by annealing the Fe-based
amorphous alloy prepared by rapidly-quenched method. The measurements of thermomagnetic curves
indicated that the Curie temperature of the amorphous phase of the samples decreases with increasing Nb
content. The optimal heat treatment was performed at Ta = 480 ?C for 30 min and showed that the ultrasoft
magnetic properties of nanocomposite materials were obtained. The magnetoimpedance (MI) of these
samples has been studied in range frequency from IMHz to 5 MHz and varying a dc magnetic field within
300 Oe. The correlation between the MI effect and the soft magnetic properties is discussed. The
incremental permeability ratio (PR) showed the drastic changes of soft magnetic properties as a function of
annealing temperatures. ?? 2007 WILEY-VCH Verlag GmbH & Co. KGaA.
