Fe84Zr3.5Nb3.5Cu1B8 melt-spun ribbons have been submitted to furnace annealing to relax quenched-in stresses and, above the first crystallization temperature, to induce nanocrystallization. The volume fraction of the nanocrystalline phase and the crystallites average size have been monitored by means of X-ray diffraction as a function of annealing temperature. Hysteresis loops have been measured on as-quenched and annealed ribbons, revealing the expected softening of the magnetic properties (reduction of the coercive field) and increase of the saturation magnetization as long as the nanocrystalline phase grows to the expense of the amorphous matrix. Low frequency (100 k-Hz-30 MHz) giant magneto-impedance is enhanced when the best soft magnetic properties of the alloy are exploited by suitable thermal treatments, but rapidly vanishes out on increasing the frequency of the exciting current. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Effect of annealing on magnetic and magnetotransport properties of Fe84Zr3.5Nb3.5Cu1B8 ribbons / Celegato, F; Coisson, Marco; Kane, S. N.; Mazaleyrat, F; Modak, S. S.; Tiberto, PAOLA MARIA; Varga, L. K.; Vinai, Franco. - In: PHYSICA STATUS SOLIDI. A, APPLICATIONS AND MATERIALS SCIENCE. - ISSN 1862-6300. - 205:8(2008), pp. 1749-1752. [10.1002/pssa.200723460]
Effect of annealing on magnetic and magnetotransport properties of Fe84Zr3.5Nb3.5Cu1B8 ribbons
CELEGATO F;COISSON, MARCO;TIBERTO, PAOLA MARIA;VINAI, FRANCO
2008
Abstract
Fe84Zr3.5Nb3.5Cu1B8 melt-spun ribbons have been submitted to furnace annealing to relax quenched-in stresses and, above the first crystallization temperature, to induce nanocrystallization. The volume fraction of the nanocrystalline phase and the crystallites average size have been monitored by means of X-ray diffraction as a function of annealing temperature. Hysteresis loops have been measured on as-quenched and annealed ribbons, revealing the expected softening of the magnetic properties (reduction of the coercive field) and increase of the saturation magnetization as long as the nanocrystalline phase grows to the expense of the amorphous matrix. Low frequency (100 k-Hz-30 MHz) giant magneto-impedance is enhanced when the best soft magnetic properties of the alloy are exploited by suitable thermal treatments, but rapidly vanishes out on increasing the frequency of the exciting current. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
