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

Veis, Martin; Antoš, Roman; Višňovský, Š.; Kulkarni, P. D.; Venkataramani, N.; Prasad, Shiva; Mistrı́k, Jan; Krishnan, R.

doi:10.3390/ma6094096

Cited by 9 publications

(5 citation statements)

References 37 publications

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“…The assigned optical and magneto‐optical transitions are related to either inter‐valence charge transfer (IVCT), inter‐sublattice charge transfer (ISCT) transitions, crystal field (CF) transitions, namely CF splitting of Co

^{2 +}

orbitals, or from

O_{2 p}

band to electronically higher A or B ion bands. Similar electronic structure and electronic transitions have also been found in other transitions metal oxides such as

{NiFe}_{2} O_{4}

{CuFe}_{2} O_{4}

{Li}_{0.5} {Fe}_{2.4} O_{4}

{MgFe}_{2} O_{4}

. Optical investigations of CCO and ZCO have revealed a strong dependence of the electronic structure on the growth method and conditions in relation to the structural properties .…”

Section: Introductionsupporting

confidence: 68%

“…Similar electronic structure and electronic transitions have also been found in other transitions metal oxides such as NiFe 2 O 4 , CuFe 2 O 4 , Li 0.5 Fe 2.4 O 4 , MgFe 2 O 4 . [8,9,18,19,20] Optical investigations of CCO and ZCO have revealed a strong dependence of the electronic structure on the growth method and conditions in relation to the structural properties. [12,27,43,44] A smaller lattice constant, narrower spectral features with lower transition energies of the CCO film grown by molecular beam epitaxy (MBE), Ref.…”

mentioning

confidence: 99%

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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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^{2 +}

orbitals, or from

O_{2 p}

band to electronically higher A or B ion bands. Similar electronic structure and electronic transitions have also been found in other transitions metal oxides such as

{NiFe}_{2} O_{4}

{CuFe}_{2} O_{4}

{Li}_{0.5} {Fe}_{2.4} O_{4}

{MgFe}_{2} O_{4}

. Optical investigations of CCO and ZCO have revealed a strong dependence of the electronic structure on the growth method and conditions in relation to the structural properties .…”

Section: Introductionsupporting

confidence: 68%

mentioning

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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show abstract

“…Fabrication procedures and parameters have important effects on MO properties since they determine the final stoichiometry of the materials [131] . Post-deposition treatments and annealing at proper temperatures and durations are used to obtain desired phases and improve crystallization for better MO properties [132], [133], [134], [135] .…”

Section: Materials Engineering For Improving Mo Propertiesmentioning

confidence: 99%

Advanced Materials and Device Architectures for Magnetooptical Spatial Light Modulators

Kharratian

Ürey

Onbaşlı

2019

Advanced Optical Materials

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Faraday and Kerr rotations are magnetooptical (MO) effects used for rotating the polarization of light in transmission and reflection from a magnetized medium, respectively. MO effects combined with intrinsically fast magnetization reversal, which can go down to a few tens of femtoseconds or less, can be applied in magnetooptical spatial light modulators (MOSLMs) promising for nonvolatile, ultrafast, and high‐resolution spatial modulation of light. With the recent progress in low‐power switching of magnetic and MO materials, MOSLMs may lead to major breakthroughs and benefit beyond state‐of‐the‐art holography, data storage, optical communications, heads‐up displays, virtual and augmented reality devices, and solid‐state light detection and ranging (LIDAR). In this study, the recent developments in the growth, processing, and engineering of advanced materials with high MO figures of merit for practical MOSLM devices are reviewed. The challenges with MOSLM functionalities including the intrinsic weakness of MO effect and large power requirement for switching are assessed. The suggested solutions are evaluated, different driving systems are investigated, and resulting device architectures are benchmarked. Finally, the research opportunities on MOSLMs for achieving integrated, high‐contrast, and low‐power devices are presented.

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“…It seems plausible to use the formalism to calculate the grating's parameters from observing the reflected light using the aforementioned methods (MOSS, ES); in this case, the inverse problem has to be solved. This has been done for both material and geometric parameters [7,13].…”

Section: The Inverse Problem 21 Definition Of the Inverse Problemmentioning

confidence: 99%

Characterization of the Inverse Problem in Critical Dimension Measurement of Diffraction Gratings

Marák

2016

Period. Polytech. Elec. Eng. Comp. Sci.

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In this paper, the inverse problem of extracting critical dimensions of the grating is defined, using data obtained by ellipsometric spectrometry. We give an overview of theoretical models describing diffraction gratings and their interactions with incident light, with a special emphasis on the coupledwave method. A method for mapping the output space (points on Poincaré's sphere defined by the ellipsometric angles for each wavelength) to the input space (grating dimensions) is presented, where samples of the output space are picked equidistantly. Using this method, distribution of the measurement precision for a given type of experimental setup is established, and tested on examples from a set of permalloy gratings.

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

Cited by 9 publications

References 37 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

Advanced Materials and Device Architectures for Magnetooptical Spatial Light Modulators

Characterization of the Inverse Problem in Critical Dimension Measurement of Diffraction Gratings

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