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Type: Artigo de periódico
Title: Magnetization studies of binary and ternary Co-rich phases of the Co-Si-B system
Author: BORMIO-NUNES, Cristina
NUNES, Carlos Angelo
COELHO, Adelino A.
FARIA, Maria Ismenia Sodero Toledo
SUZUKI, Paulo Atsushi
COELHO, Gilberto Carvalho
Abstract: CoB, CO(2)B, CoSi, Co(2)Si and CO(5)Si(2)B phases can be formed during heat-treatment of amorphous co-Si-B soft magnetic materials. Thus, it is important to determine their magnetic behavior as a function of applied field and temperature. In this study, polycrystalline single-phase samples of the above phases were produced via arc melting and heat-treatment under argon. The single-phase nature of the samples was confirmed via X-ray diffraction experiments. AC and DC magnetization measurements showed that Co(2)Si and CO(5)Si(2)B phases are paramagnetic. Minor amounts of either Co(2)Si or CoSi(2) in the CoSi-phase sample suggested a paramagnetic behavior of the CoSi-phase, however, it should be diamagnetic as shown in the literature. The diamagnetic behavior of the CoB phase was also confirmed. The paramagnetic behavior of CO(5)Si(2)B is for the first time reported. The magnetization results of the phase CO(2)B have a ferromagnetic signature already verified on previous NMR studies. A detailed set of magnetization measurements of this phase showed a change of the easy magnetization axis starting at 70K, with a temperature interval of about 13K at a very small field of 1 mT. As the strength of the field is increased the temperature interval is enlarged. The strength of field at which the magnetization saturates increases almost linearly as the temperature is increased above 70K. The room temperature total magnetostriction of the CO(2)B phase was determined to be 8 ppm at a field of 1T. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Co-Si-B alloys
Cobalt suicides
Cobalt borides
Magnetic properties
Country: Suiça
Citation: JOURNAL OF ALLOYS AND COMPOUNDS, v.508, n.1, p.5-8, 2010
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2010.08.019
Date Issue: 2010
Appears in Collections:IFGW - Artigos e Materiais de Revistas Científicas

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