Size-dependent structural, magnetic, and optical properties of MnCo2O4 nanocrystallites
Singh, S (Singh, S.); Pramanik, P (Pramanik, P.); Sangaraju, S (Sangaraju, S.); Mallick, A (Mallick, A.); Giebeler, L (Giebeler, L.); Thota, S (Thota, S.)
2017
Source PublicationJOURNAL OF APPLIED PHYSICS
Volume121Issue:19
AbstractFinite-size (d = 5.4-112 nm) and surface effects on the structural, optical, and magnetic properties of ferrimagnetic inverse-spinel MnCo2O4 are reported. For d >= 87 nm, partial tetragonal distortion of the inverse spinel-lattice was observed. The Curie temperature T-C of MnCo2O4 nanostructures, as determined by dc-magnetic susceptibility (chi) measurements, follows a finite-size scaling relation T-C(d) = T-C(infinity)[1-(xi(0)/d)(lambda)] with a shift exponent lambda = 0.75 +/- 0.15 and microscopic correlation length xi(0) = 1.4 +/- 0.3 nm, which is consistent with the mean field theory. For T > T-C, chi(T) fits Neel's expression for the two-sublattice model with antiferromagnetic molecular field (exchange) constants N-BB similar to 85.16 (J(BB) similar to 2.94 x 10(-22) J), N-AB similar to 110.96 (J(AB) similar to 1.91 x 10(-22) J), and N-AA similar to 43.8 (J(AA) similar to 1.13 x 10(-22) J) and asymptotic Curie temperature T-a similar to 717.63 K. The optical energy bandgap E-g, evaluated from the Kubelka-Munk function ([F(R-infinity)(h) over bar omega](2) = C-2((h) over bar omega - E-g)) is blueshifted to 2.4 eV (d similar to 5.4 nm) from 1.73 eV (d similar to 112 nm) due to the quantum confinement and non-stoichiometry. The role of tetragonal distortion and grain-size-effects in the intensity of crystal field transitions and variation in the magnetic ordering are further discussed and compared with Co3O4 nanostructures. Published by AIP Publishing.
DOI10.1063/1.4983360
WOS IDWOS:000401771800013
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Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/4837
Collection中国科学院特殊环境功能材料与器件重点试验室
Affiliation1.West Univ Virginia, Dept Phys & Astron, Morgantown, WV 26506 USA
2.Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India
3.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, 40-1 South Beijing Rd, Urumqi 830011, Peoples R China
4.Leibniz Inst Solid State & Mat Res IFW Dresden eV, Helmholtzstr 20, D-01069 Dresden, Germany
Recommended Citation
GB/T 7714
Singh, S ,Pramanik, P ,Sangaraju, S ,et al. Size-dependent structural, magnetic, and optical properties of MnCo2O4 nanocrystallites[J]. JOURNAL OF APPLIED PHYSICS,2017,121(19).
APA Singh, S ,Pramanik, P ,Sangaraju, S ,Mallick, A ,Giebeler, L ,&Thota, S .(2017).Size-dependent structural, magnetic, and optical properties of MnCo2O4 nanocrystallites.JOURNAL OF APPLIED PHYSICS,121(19).
MLA Singh, S ,et al."Size-dependent structural, magnetic, and optical properties of MnCo2O4 nanocrystallites".JOURNAL OF APPLIED PHYSICS 121.19(2017).
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