Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/65721
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Electrical Engineering | - |
dc.creator | Feng, C | - |
dc.creator | Liu, X | - |
dc.creator | Or, SW | - |
dc.creator | Ho, SL | - |
dc.date.accessioned | 2017-05-22T02:09:06Z | - |
dc.date.available | 2017-05-22T02:09:06Z | - |
dc.identifier.uri | http://hdl.handle.net/10397/65721 | - |
dc.language.iso | en | en_US |
dc.publisher | American Institute of Physics | en_US |
dc.rights | © 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | en_US |
dc.rights | The following publication C. Feng et al., AIP Advances 7, 56403 (2017) is available at https://dx.doi.org/10.1063/1.4972805 | en_US |
dc.title | Exchange coupling and microwave absorption in core/shell-structured hard/soft ferrite-based CoFe2O4/NiFe2O4 nanocapsules | en_US |
dc.type | Journal/Magazine Article | en_US |
dc.identifier.volume | 7 | - |
dc.identifier.issue | 5 | - |
dc.identifier.doi | 10.1063/1.4972805 | - |
dcterms.abstract | Core/shell-structured, hard/soft spinel-ferrite-based CoFe2O4/NiFe2O4 (CFO/NFO) nanocapsules with an average diameter of 17 nm are synthesized by a facile two-step hydrothermal process using CFO cores of ∼15 nm diameter as the hard magnetic phase and NFO shells of ∼1 nm thickness as the soft magnetic phase. The single-phase-like hysteresis loop with a high remnant-to-saturation magnetization ratio of 0.7, together with a small grain size of ∼16 nm, confirms the existence of exchange-coupling interaction between the CFO cores and the NFO shells. The effect of hard/soft exchange coupling on the microwave absorption properties is studied. Comparing to CFO and NFO nanoparticles, the finite-size NFO shells and the core/shell structure enable a significant reduction in electric resistivity and an enhancement in dipole and interfacial polarizations in the CFO/NFO nanocapsules, resulting in an obvious increase in dielectric permittivity and loss in the whole S-Ku bands of microwaves of 2-18 GHz, respectively. The exchange-coupling interaction empowers a more favorable response of magnetic moment to microwaves, leading to enhanced exchange resonances in magnetic permeability and loss above 10 GHz. As a result, strong absorption, as characterized by a large reflection loss (RL) of -20.1 dB at 9.7 GHz for an absorber thickness of 4.5 mm as well as a broad effective absorption bandwidth (for RL<-10 dB) of 8.4 GHz (7.8-16.2 GHz) at an absorber thickness range of 3.0-4.5 mm, is obtained. | - |
dcterms.accessRights | open access | en_US |
dcterms.bibliographicCitation | AIP advances, 2017, v. 7, no. 5, 56403, p. 056403-1-056403-6 | - |
dcterms.isPartOf | AIP advances | - |
dcterms.issued | 2017 | - |
dc.identifier.scopus | 2-s2.0-85006982954 | - |
dc.identifier.ros | 2016005296 | - |
dc.identifier.eissn | 2158-3226 | - |
dc.identifier.artn | 56403 | - |
dc.identifier.rosgroupid | 2016005047 | - |
dc.description.ros | 2016-2017 > Academic research: refereed > Publication in refereed journal | - |
dc.description.validate | 201804_a bcma | - |
dc.description.oa | Version of Record | en_US |
dc.identifier.FolderNumber | OA_IR/PIRA | en_US |
dc.description.pubStatus | Published | en_US |
dc.description.oaCategory | CC | en_US |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
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Feng_Exchange_Coupling_Microwave.pdf | 6.33 MB | Adobe PDF | View/Open |
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