SQUID studies of Co–Cu heterogeneous alloy nanowires

• Published in: Journal of magnetism and magnetic materials Vol. 208; no. 3; pp. 251 - 254
• Main Authors: Blythe, H.J, Fedosyuk, V.M, Kasyutich, O.I, Schwarzacher, W
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-01-2000; Elsevier Science
• Subjects: Alloys; Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures); Magnetic properties and materials; Magnetic properties of surface, thin films and multilayers; Metals. Metallurgy; Nanowires; Physics; SQUID magnetometry; Zero field cooling; 75.50.T; Zero field cooling; Nanowires; SQUID magnetometry; 75.30.C; Alloys; Binary alloys; Temperature dependence; Magnetization; Anisotropy; Wires; Copper base alloys; Nanostructures; Experimental study; Cobalt alloys; Transition element alloys; Magnetic susceptibility
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(99)00598-3

Heterogeneous Co
20Cu
80 alloy nanowires were prepared by electrodeposition and their magnetic properties studied using SQUID magnetometry. Magnetization curves show the influence of the shape anisotropy of the wires. Zero field-cooled (ZFC) initial magnetic susceptibility measurements indicate a range of blocking temperatures which extends at least to room temperature, suggesting the presence of some relatively large Co-rich clusters. A sharp rise in the ZFC susceptibility for the smallest diameter wires at temperatures below about 20
K suggests that in these wires there are also some extremely small clusters present.