Annealing-induced enhancement of ferromagnetism in SnO2-core/Cu-shell coaxial nanowires
- Authors
- Kim, Hyoun Woo; Na, Han Gil; Yang, Ju Chan; Ahn, Jinho; Yoon, Chong Seung; Ham, Heon; Shim, Kwang Bo; Choi, Changhwan; Kang, Inpil; Yang, Jae-Hak; Lee, Chongmu
- Issue Date
- Aug-2011
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- fibers; annealing; ferromagnetic materials; sputtering; transmission electron microscopy (TEM)
- Citation
- METALS AND MATERIALS INTERNATIONAL, v.17, no.4, pp.641 - 647
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- METALS AND MATERIALS INTERNATIONAL
- Volume
- 17
- Number
- 4
- Start Page
- 641
- End Page
- 647
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/28088
- DOI
- 10.1007/s12540-011-0819-3
- ISSN
- 1598-9623
- Abstract
- In this study, we have coated tin oxide (SnO2) nanowires with a Cu shell layer via the sputtering method and subsequently investigated the effects of thermal annealing. The annealing-induced changes in morphologies, microstructures, and compositions of the resulting core-shell nanowires were characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and energydispersive X-ray spectroscopy (EDX). The Cu shell layers were agglomerated to form clusters, which were mainly comprised of the Cu2O phase. For the first time, a hysteresis loop indicating weak ferromagnetism was observed from the pure SnO2 nanowires. Both the coercivity and the retentivity in the hysteresis loop were slightly increased by Cu-sputtering, indicating a very slight enhancement of ferromagnetism. Also, the ferromagnetic behavior was significantly enhanced by thermal annealing. We discuss the possible mechanisms of annealing-induced enhancement of ferromagnetism in the SiO2/Cu core-shell nanowires, which include the generation of Cu2O phase, Cu-doping into the SnO2 lattice, and the generation of oxygen vacancies in SnO2 core nanowires.
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