Electronic structure calculations for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">ZnFe</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Soliman, Saied M.; Elfalaky, A.; Fecher, Gerhard H.; Felser, Claudia

doi:10.1103/physrevb.83.085205

Cited by 57 publications

(25 citation statements)

References 17 publications

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“…When A is a magnetic ion, a net magnetic moment of the eight parts forming the unit cell in

{AB}_{2} O_{4}

is present due to uncompensated magnetic moments of the A and/or B magnetic sub‐lattices. According to the strength of the oxygen‐mediated A–O–A or A–O–B coupling materials are either ferrimagnetic or ferromagnetic .…”

Section: Introductionmentioning

confidence: 99%

Comparative study of optical and magneto‐optical properties of normal, disordered, and inverse spinel‐type oxides

Zviagin

Richter

Böntgen

et al. 2015

Physica Status Solidi (b)

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Co3O4, ZnFe2O4, CoFe2O4, ZnCo2O4, and Fe3O4 thin films were fabricated by pulsed laser deposition at high and low temperatures resulting in crystalline single‐phase normal, inverse, as well as disordered spinel oxide thin films with smooth surface morphology. The dielectric function, determined by spectroscopic ellipsometry in a wide spectral range from 0.5 to 8.5 eV, is compared with the magneto‐optical response of the dielectric tensor, investigated by magneto‐optical Kerr effect spectroscopy in the spectral range from 1.7 to 5.5 eV with an applied magnetic field of 1.7 T. Crystal field, inter‐valence, and inter‐sublattice charge transfer transitions, and transitions from O2p to metal cation 3d or 4s bands are identified in both the principal diagonal elements and the magneto‐optically active off‐diagonal elements of the dielectric tensor. Depending on the degree of cation disorder, resulting in local symmetry distortion, the magneto‐optical response is found to be strongest for high crystal quality inverse spinels and for disordered normal spinel structure, contrary to the first principle studies of CoFe2O4 and ZnFe2O4. The results presented provide a basis for deeper understanding of light–matter interaction in this material system that is of vital importance for device‐related phenomena and engineering.

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“…When A is a magnetic ion, a net magnetic moment of the eight parts forming the unit cell in

{AB}_{2} O_{4}

Section: Introductionmentioning

confidence: 99%

Comparative study of optical and magneto‐optical properties of normal, disordered, and inverse spinel‐type oxides

Zviagin

Richter

Böntgen

et al. 2015

Physica Status Solidi (b)

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“…Non-equilibrium cation distribution found in nano materials with large surface to volume ratio, gives rise to anomalous properties in the nano ferrite. 3,7,8 The cation distribution is expected to affect the magnetization via cation-cation (c-c)/cation-anion-cation(c-a-c) or A-B exchange interaction, electrical conductivity, magnetic anisotropy, Curie temperature (T C ), and the magnetostriction coefficient of the material. 9,10 Cation migration can be enabled by thermal effects like annealing and quenching, 11 particle size, 12 lattice diffusion, 13 preparation condition, 2 namely, reduction reaction leading to reduction in the Fe content at B-site, 6,14,15 pressure, 16 and strain.…”

Section: Introductionmentioning

confidence: 99%

Metallic magnetism and change of conductivity in the nano to bulk transition of cobalt ferrite

Arunkumar

Vanidha

Oudayakumar

et al. 2013

Journal of Applied Physics

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Articles you may be interested inThermal effect on magnetic parameters of high-coercivity cobalt ferrite J. Appl. Phys. 116, 033901 (2014); 10.1063/1.4890033Structural and ambient/sub-ambient temperature magnetic properties of Er-substituted cobalt-ferrites synthesized by sol-gel assisted auto-combustion method Variations in conductivity with particle size have been observed in cobalt ferrite, when synthesized by solgel auto-combustion method. Impedance analysis reveals metallic and semiconducting behavior at room temperature for a particle size of 6 nm and 52 nm, respectively. Upon thermal activation, metallic to semiconducting phase transition has been observed as a function of particle size and vice-versa. Grainboundary Resistance (R gb ), increased drastically with particle size (19 MX for 6 nm and 259 MX for 52 nm) at room temperature. AC conductivity and dielectric constants exhibit similar metallic to semiconducting phase transition at 6 nm and semiconducting behavior at 52 nm with temperature in the selected frequencies. Enhanced magnetic moment with an increase in the grain size along with decreased coercivity (1444 G to 1146 G) reveals transition from single domain to multi-domain. Increased inter-particle interaction is responsible for metallicity at the nano level and on the contrary semiconductivity is attributed to bulk. V C 2013 AIP Publishing LLC. [http://dx.

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“…These applications are based on magnetic behavior of ZnFe 2 O 4 which is very unusual and still deeper investigations are being carried out [11,12]. Magnetic ordering for these nanoparticles may be tuned upto room temperature (RT) depending on method of synthesis and size which can neither expected in bulk [13][14][15][16][17]. Magnetic ordering at nanoscale are affected by spin frustration, surface and interface effects, defects and their nature alongwith cation inversion induced by smaller size [18].…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic ordering at nanoscale are affected by spin frustration, surface and interface effects, defects and their nature alongwith cation inversion induced by smaller size [18]. Cation inversion for ferrites is defined as the ratio of Fe ions at tetrahedral site to octahedral site of spinel structure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Crystallite size induced crossover from paramagnetism to superparamagnetism in zinc ferrite nanoparticles

Singh

Gautam

Srivastava

et al. 2015

Superlattices and Microstructures

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Electronic structure calculations forZnFe2O4

Cited by 57 publications

References 17 publications

Comparative study of optical and magneto‐optical properties of normal, disordered, and inverse spinel‐type oxides

Comparative study of optical and magneto‐optical properties of normal, disordered, and inverse spinel‐type oxides

Metallic magnetism and change of conductivity in the nano to bulk transition of cobalt ferrite

Crystallite size induced crossover from paramagnetism to superparamagnetism in zinc ferrite nanoparticles

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