The heterogeneous metal oxide composite (where ), comprised primarily of the three oxide phases (, spinel , and SrO), exhibits a special temperature-magnetic response profile. The coercivity of the composite decreases with increasing temperature from , but increases from . This outcome is upheld because of the occurrence of three structures, which are the perovskite phase that is formed at the interface region of the above three oxides, the presence of in the phase, and the interface between SrO and phases (domains). The first two structures are deemed responsible for manifestation of ferromagnetism at low temperature, while the last one for room temperature ferromagnetism. We also noted that the third structure could reveal noticeable magnetic properties only when the three major oxide phases are mixed in nanometer scale as the magnetic behavior is triggered through the deformation of octahedral Co-O cells located at the surface of the spinel domains. To realize such an ultrahigh dispersion of the three oxide phases, pyrolysis of the metal-ion-containing hydrogel made of the three metal ions (, , and ) and organic moieties (e.g., citric acid and glycine) is an effective approach. In contrast to the homogeneous perovskite solid solution , the present type of composite shows stronger coercivity but weaker remanence induction at temperatures below . Other than the temperature effect, the influence of the organic components in the metal-ion-containing hydrogel on the interface-sustained magnetism has also been studied.
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15 December 2005
Research Article|
December 22 2005
Interface-sustained magnetic properties displayed by the nanocomposite
Siok Wei Tay;
Siok Wei Tay
Department of Chemical and Biomolecular Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
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Liang Hong;
Liang Hong
a)
Department of Chemical and Biomolecular Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
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Zhaolin Liu
Zhaolin Liu
Institute of Materials Research & Engineering
, 3 Research Link, Singapore 117602
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a)
Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Appl. Phys. 98, 124308 (2005)
Article history
Received:
May 11 2005
Accepted:
November 11 2005
Citation
Siok Wei Tay, Liang Hong, Zhaolin Liu; Interface-sustained magnetic properties displayed by the nanocomposite. J. Appl. Phys. 15 December 2005; 98 (12): 124308. https://doi.org/10.1063/1.2148628
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