Size- and Composition-Dependent Radio Frequency Magnetic Permeability of Iron Oxide Nanocrystals
- Authors
- Yun, Hongseok; Liu, Xiyu; Paik, Taejong; Palanisamy, Duraivelan; Kim, Jungkwun; Vogel, William D.; Viescas, Arthur J.; Chen, Jun; Papaefthymiou, Georgia C.; Kikkawa, James M.; Allen, Mark G.; Murray, Christopher B.
- Issue Date
- Dec-2014
- Publisher
- AMER CHEMICAL SOC
- Keywords
- magnetite; maghemite; superparamagnetism; radio frequency; magnetic susceptibility; inductor
- Citation
- ACS NANO, v.8, no.12, pp 12323 - 12337
- Pages
- 15
- Journal Title
- ACS NANO
- Volume
- 8
- Number
- 12
- Start Page
- 12323
- End Page
- 12337
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/66734
- DOI
- 10.1021/nn504711g
- ISSN
- 1936-0851
1936-086X
- Abstract
- We investigate the size- and composition-dependent ac magnetic permeability of superparamagnetic iron oxide nanocrystals for radio frequency (RF) applications. The nanocrystals are obtained through high-temperature decomposition synthesis, and their stoichiometry is determined by Mossbauer spectroscopy. Two sets of oxides are studied: (a) as-synthesized magnetite-rich and (b) aged maghemite nanocrystals. All nanocrystalline samples are confirmed to be in the superparamagnetic state at room temperature by SQUID magnetometry. Through the one-turn inductor method, the ac magnetic properties of the nanocrystalline oxides are characterized. In magnetite-rich iron oxide nanocrystals, size-dependent magnetic permeability is not observed, while maghemite iron oxide nanocrystals show clear size dependence. The inductance, resistance, and quality factor of hand-wound inductors with a superparamagnetic composite core are measured. The superparamagnetic nanocrystals are successfully embedded into hand-wound inductors to function as inductor cores.
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