2017 IEEE International Magnetics Conference (INTERMAG) 2017
DOI: 10.1109/intmag.2017.8007644
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Probing core and shell contributions to exchange bias in Co/Co<inf>3</inf>O<inf>4</inf> nanoparticles of controlled size

Abstract: Coupling at the interface of core/shell magnetic nanoparticles is known to be responsible for exchange bias (EB) and the relative sizes of core and shell components are supposed to influence the associated phenomenology. In this work, we have prepared core/shell structured nanoparticles with a total average diameter around ∼27 nm and a wide range of shell thicknesses through the controlled oxidation of Co nanoparticles well dispersed in an amorphous silica host. Structural characterizations give compelling evi… Show more

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Cited by 3 publications
(9 citation statements)
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References 57 publications
(121 reference statements)
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“…As shown by the blue line, the core−shell Co@CoO nanoparticles are similar to previously reported cases. 21,22 Moreover, the coexistence of crystallized Co and CoO was also proved by XRD shown in Figure 2. With the increase of film thickness, the intensity of both Co and CoO increases, which means more and more crystalline phase is formed on the matrix.…”
Section: Resultsmentioning
confidence: 73%
“…As shown by the blue line, the core−shell Co@CoO nanoparticles are similar to previously reported cases. 21,22 Moreover, the coexistence of crystallized Co and CoO was also proved by XRD shown in Figure 2. With the increase of film thickness, the intensity of both Co and CoO increases, which means more and more crystalline phase is formed on the matrix.…”
Section: Resultsmentioning
confidence: 73%
“…At the same time, they lead to the emergence of enriched physico-chemical properties, which distinguish them from their bulk counterparts. Among different classes of nanomaterials, core/shell structures are fundamentally interesting because of carrying two different physico-chemical properties in one single particle at the nanoscale [6]. Though primarily core/shell structures were synthesized to protect and stabilize the metallic core [7], advances in materials fabrication and synthesis have made core/shell structures potential candidates for a myriad of new applications including targeted drug delivery [8], biomedical sensors [9], enhanced electronic properties [10] or EB effect [6].…”
Section: Introductionmentioning
confidence: 99%
“…Among different classes of nanomaterials, core/shell structures are fundamentally interesting because of carrying two different physico-chemical properties in one single particle at the nanoscale [6]. Though primarily core/shell structures were synthesized to protect and stabilize the metallic core [7], advances in materials fabrication and synthesis have made core/shell structures potential candidates for a myriad of new applications including targeted drug delivery [8], biomedical sensors [9], enhanced electronic properties [10] or EB effect [6]. If the core and shell are composed of two materials with different magnetic orders, the interfacial region may experience a structural modification due to differences in the crystalline structures of both regions as well as a competition between the different magnetic orders favored at the core and shell.…”
Section: Introductionmentioning
confidence: 99%
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“…This significantly demands a better understanding of d-electron behavior, chemical bonding, and interfacial charge transfer properties of with Co 2+ (S = 3/2) and Co 3+ (S = 0) ions placed at the tetrahedral (A) and octahedral (B) sites, respectively, where the magnetic moments of Co 2+ ions order antiferromagnetically below Neél transition temperature (T N ). 17 Density functional theory calculations 18 suggest that the conduction band of Co 3 O 4 is mainly composed of Co 2+ t 2g minority spin orbitals and Co 3+ e g orbitals, whereas the valence band has contributions from filled d orbitals of both cobalt oxidation states and 2p orbitals of oxygen anion with some extent of hybridization between them. This indicates its approximate Mott−Hubbard type insulating nature with a small band gap of ∼0.8 eV.…”
Section: Introductionmentioning
confidence: 99%