Magneto-optical investigation of spinel ferrite CuFe2O4: observation of Jahn–Teller effect in Cu2+ ion

Kim, Kwang Joo; Lee, Jung Han; Lee, Sung Ho

doi:10.1016/j.jmmm.2004.01.078

Cited by 62 publications

(17 citation statements)

References 18 publications

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“…Kim et al [16] assigned the spectroscopic structures observed in the polar Kerr spectra of CuFe

_{2}

_{4}

to particular electron transitions. Unlike the permittivity tensor, the Kerr spectra are not directly related to the electronic structure, and such assignment is only approximative.…”

Section: Introductionmentioning

confidence: 99%

Complete Permittivity Tensor in Sputtered CuFe2O4 Thin Films at Photon Energies between 2 and 5 eV

et al. 2013

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This work is devoted to the systematic study of the optical and magneto-optical properties of sputter deposited CuFe2O4 thin films in the photon energy region between 2 and 5 eV using spectroscopic ellipsometry and magneto-optical Kerr spectroscopy. The spectral dependence of both the diagonal and off-diagonal elements of the permittivity tensor is determined. A complete picture about the electron transitions in CuFe2O4 is suggested in the frame of intervalence charge transfer and intersublattice charge transfer transitions. The effect of deposition conditions and post-deposition treatment in CuFe2O4 films upon the optical and magneto-optical properties is discussed.

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“…Kim et al [16] assigned the spectroscopic structures observed in the polar Kerr spectra of CuFe

_{2}

_{4}

to particular electron transitions. Unlike the permittivity tensor, the Kerr spectra are not directly related to the electronic structure, and such assignment is only approximative.…”

Section: Introductionmentioning

confidence: 99%

Complete Permittivity Tensor in Sputtered CuFe2O4 Thin Films at Photon Energies between 2 and 5 eV

et al. 2013

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“…We have recently shown that the microphase separation of block copolymers can provide a platform to simple and complex oxide materials at surfaces by a process of selected block inclusion1213. Iron oxide provides a suitable exemplary to work on since it is provides a system of choice in many applications141516. In this work, we wanted to develop this approach to demonstrate that it could be used to control the size of the oxide particles and their distance apart as well as the technique being compatible with further silicon based processing to yield complex heterostructures.…”

mentioning

confidence: 99%

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application

Ghoshal

Maity²,

Senthamaraikannan

et al. 2013

Sci Rep

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Highly dense hexagonally arranged iron oxide nanodots array were fabricated using PS-b-PEO self-assembled patterns. The copolymer molecular weight, composition and choice of annealing solvent/s allows dimensional and structural control of the nanopatterns at large scale. A mechanism is proposed to create scaffolds through degradation and/or modification of cylindrical domains. A methodology based on selective metal ion inclusion and subsequent processing was used to create iron oxide nanodots array. The nanodots have uniform size and shape and their placement mimics the original self-assembled nanopatterns. For the first time these precisely defined and size selective systems of ordered nanodots allow careful investigation of magnetic properties in dimensions from 50 nm to 10 nm, which delineate the nanodots are superparamagnetic, well-isolated and size monodispersed. This diameter/spacing controlled iron oxide nanodots systems were demonstrated as a resistant mask over silicon to fabricate densely packed, identical ordered, high aspect ratio silicon nanopillars and nanowire features.

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“…Copper ferrite, characterized by the cubic-to-tetragonal phase transition induced by Jahn-Teller distortion, has been studied for decades. [1][2][3][4][5][6][7][8][9] It has been established that the magnitude of the tetragonal distortion, characterized by the c / a ratio as referred to the cubic cell, can be modified by changing the distribution of copper ions on the A and B sublattices. The modifications of the tetragonal distortion of copper ferrite also lead to significant changes in magnetic properties, such as coercive force and saturation magnetization.…”

mentioning

confidence: 99%

Ab initio study on copper ferrite

Feng

Yang

Zuo

et al. 2010

Journal of Applied Physics

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The impact of cation distribution on electronic structure and magnetic properties is investigated by the first-principle calculation. The structure optimization is based on generalized gradient approximation (GGA) exchange-correlation and projector augmented wave method. The optimized structures of inverse and normal copper ferrite are tetragonal (c/a=1.06) and cubic, respectively. The optimized structure of partial inverse copper ferrites can be cubic, tetragonal, or triclinic depending on the distribution of copper ions. The calculation of electronic structure is based on full potential linear augmented plane wave method and GGA+U exchange-correlation. The calculated density of states shows that the distribution of Cu ions impacts the electronic structure significantly. The normal and inverse copper ferrite are half-metallic and semiconducting, respectively. The partial inverse copper ferrites are metallic or half-metallic.

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Magneto-optical investigation of spinel ferrite CuFe2O4: observation of Jahn–Teller effect in Cu2+ ion

Cited by 62 publications

References 18 publications

Complete Permittivity Tensor in Sputtered CuFe2O4 Thin Films at Photon Energies between 2 and 5 eV

Complete Permittivity Tensor in Sputtered CuFe2O4 Thin Films at Photon Energies between 2 and 5 eV

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application

Ab initio study on copper ferrite

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