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FORMATION OF THE NANOCRYSTALLINE CUBIC (FeNi)23B6 PHASE IN THE NICKEL-RICH FeNiZrB ALLOYS AND ITS MAGNETIC BEHAVIOUR

B. Idzikowski1,* , A. Szajek1

Affiliation

  1. Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17 PL 60-179 Poznán, Poland

Abstract

Nickel-rich amorphous precursor with nominal chemical composition of Ni64Fe16Zr7B12Au1 was produced by melt-spinning technique and then heat-treated at temperatures ranged from 420 to 465°C for one hour, to form nanostructure. The transformation from the amorphous state into the nanocrystalline state was investigated by DSC and XRD techniques. Due to annealing in amorphous matrix appear grain fraction (5-50 nm in diameter) of magnetically ordered cubic FexNi23-xB6 phase, as was identified by XRD measurements. The magnetic behaviour of pure Ni23B6 and Fe23B6 phases was studied theoretically using the spin polarized tight binding linear muffin-tin orbital (TB-LMTO) method. Anomalously high magnetic moments of Fe atoms were found in some nonequivalent positions in the crystal structure..

Keywords

Amorphous alloys, Nanocrystallization, Exchange interactions, Density of states, Local magnetic moments.

Submitted at: Sept. 4, 2002
Accepted at: March 12, 2003

Citation

B. Idzikowski, A. Szajek, FORMATION OF THE NANOCRYSTALLINE CUBIC (FeNi)23B6 PHASE IN THE NICKEL-RICH FeNiZrB ALLOYS AND ITS MAGNETIC BEHAVIOUR, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 239-244 (2003)