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Type: Artigo de periódico
Title: Studies of Fe-Cu microwires with nanogranular structure
Author: Zhukov, A
Garcia, C
Del Val, JJ
Gonzalez, J
Knobel, M
Serantes, D
Baldomir, D
Zhukova, V
Abstract: We report on the fabrication, and structural and magnetic characterization of Cu(63)Fe(37) microwires with granular structure produced by rapid quenching, using the TailorUlitovsky method, from the immiscible alloys. X-ray diffraction study demonstrated that the structure consists of small (6-45 nm) crystallites of Cu and body centred cubic alpha-Fe. Magnetic properties have been measured in the range of 5-300 K using a SQUID (superconducting quantum interference device) magnetometer. The temperature dependences of the magnetization measured in a cooling regime when no external magnetic field is applied (zero-field cooling) and in the presence of the field (field cooling) show considerable difference below 20 K. This difference could be related to the presence of small alpha-Fe grains embedded in the Cu matrix. Those alpha-Fe grains appear to be blocked at temperatures below that at which the maximum of the magnetization is observed in the low temperature range. Significant magnetoresistance (about 7%) has been found in the samples studied. The shape of the observed dependences is typical of a giant magnetoresistance effect.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0953-8984/21/3/035301
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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