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Charge ordering and exchange bias behaviors in Co3O4 porous nanoplatelets and nanorings

Journal Article


Abstract


  • We present the synthesis of α-Co3O4 porous nanoplatelets and hexagonal nanorings using microwave-assisted hydrothermal and conventional chemical reaction methods. The x-ray diffraction (XRD) and refinement analyses indicate the α-Co3O4 crystal structure, and the x-ray photoelectron spectrum (XPS) indicates the high purity of the samples. The M–T (including 1/χ–T) curves indicate an antiferromagnetic transition at about 35 K in both kind of samples but the interesting finding was made that a charge-ordered (CO) state appears at 250 K for the nanoplatelets sample whereas it is inattentive for the nanorings. The antiferromagnetic transition temperature TN is lower than that of the bulk α-Co3O4 single crystal due to the nanosized structures. We observed quite significant exchange bias for nanorings. The exchange bias behavior of the α-Co3O4 hexagonal nanorings is consistent with an antiferromagnetic (AFM) Co3O4 core and spin-glass like shell.

Authors


  •   Debnath, J C. (external author)
  •   Wang, Jian Li.
  •   Zeng, R (external author)

Publication Date


  • 2017

Citation


  • Debnath, J. C., Wang, J. & Zeng, R. (2017). Charge ordering and exchange bias behaviors in Co3O4 porous nanoplatelets and nanorings. Journal of Magnetism and Magnetic Materials, 421 422-427.

Scopus Eid


  • 2-s2.0-84982307290

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2353

Number Of Pages


  • 5

Start Page


  • 422

End Page


  • 427

Volume


  • 421

Abstract


  • We present the synthesis of α-Co3O4 porous nanoplatelets and hexagonal nanorings using microwave-assisted hydrothermal and conventional chemical reaction methods. The x-ray diffraction (XRD) and refinement analyses indicate the α-Co3O4 crystal structure, and the x-ray photoelectron spectrum (XPS) indicates the high purity of the samples. The M–T (including 1/χ–T) curves indicate an antiferromagnetic transition at about 35 K in both kind of samples but the interesting finding was made that a charge-ordered (CO) state appears at 250 K for the nanoplatelets sample whereas it is inattentive for the nanorings. The antiferromagnetic transition temperature TN is lower than that of the bulk α-Co3O4 single crystal due to the nanosized structures. We observed quite significant exchange bias for nanorings. The exchange bias behavior of the α-Co3O4 hexagonal nanorings is consistent with an antiferromagnetic (AFM) Co3O4 core and spin-glass like shell.

Authors


  •   Debnath, J C. (external author)
  •   Wang, Jian Li.
  •   Zeng, R (external author)

Publication Date


  • 2017

Citation


  • Debnath, J. C., Wang, J. & Zeng, R. (2017). Charge ordering and exchange bias behaviors in Co3O4 porous nanoplatelets and nanorings. Journal of Magnetism and Magnetic Materials, 421 422-427.

Scopus Eid


  • 2-s2.0-84982307290

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2353

Number Of Pages


  • 5

Start Page


  • 422

End Page


  • 427

Volume


  • 421