Magnetic anisotropy of epitaxial zinc ferrite thin films grown by pulsed laser deposition

Timopheev, A. A.; Azevedo, Ana M.; Соболев, Н. А.; Brachwitz, Kerstin; Lorenz, Michael; Ziese, M.; Esquinazi, P.; Grundmann, Marius

doi:10.1016/j.tsf.2012.12.028

Cited by 16 publications

(18 citation statements)

References 20 publications

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“…LT CCO and LT CFO films, however, are X‐ray amorphous. The lattice constants for ZFO and ZCO films are closer to the bulk values for samples grown at high temperature, as expected for a more ideal cubic structure . The shift of the lattice constant is due to fewer defects, such as cation disorder and oxygen vacancies, a lattice relaxation with increasing growth temperature is therefore observable ().…”

Section: Methodssupporting

confidence: 62%

“…With a chemical formula

{AB}_{2} O_{4}

, spinel ferrites and cobaltites consist of a cubic close‐packed arrangement of oxygen ions, with A

^{2 +}

and B

^{3 +}

ions located at two different crystallographic sites (). The ideal crystallization process results in either normal or inverse spinel structure depending on the material, while the growth temperature determines the level of disorder in these structures .

{Co}_{3} O_{4}

(CCO),

{ZnFe}_{2} O_{4}

(ZFO), and

{ZnCo}_{2} O_{4}

(ZCO) are ideally crystallizing in a normal spinel structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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.

show abstract

Section: Methodssupporting

confidence: 62%

“…With a chemical formula

{AB}_{2} O_{4}

, spinel ferrites and cobaltites consist of a cubic close‐packed arrangement of oxygen ions, with A

^{2 +}

and B

^{3 +}

{Co}_{3} O_{4}

(CCO),

{ZnFe}_{2} O_{4}

(ZFO), and

{ZnCo}_{2} O_{4}

(ZCO) are ideally crystallizing in a normal spinel structure.…”

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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show abstract

“…Studies on other ferrites nanoparticles irradiated by swift heavy ions also indicated a small increase of the coercivity [42][43][44][45] for samples where the irradiation lead to crystal growth, cation redistribution and surface modifications. Singh et al (39) reported in a similar study on size dependent features of swift heavy ion irradiation in nanoparticles zinc ferrite systems. They observed that structural properties of the samples with smaller particle size are more sensitive towards irradiation.…”

Section: Magnetic Propertiesmentioning

confidence: 81%

Structural and magnetic properties of zinc ferrite thin films irradiated by 90 keV neon ions

Gafton

Bulai

Caltun

et al. 2016

Applied Surface Science

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“…Zn 2+ and Fe 3+ ions occupy tetrahedral ( A -site) and octahedral ( B -site) sites formed by 4 and 6 O 2− ions, respectively [ 6 ]. In zinc ferrite, properties are affected by the cation redistribution and a lot of reports are available establishing a relationship between the microstructure of these films and cation redistribution [ 7 – 9 ]. Thus, microstructural properties are more important in the case of amorphous films.…”

Section: Introductionmentioning

confidence: 99%

“…These measurements provide information on the metallic valence state, hybridization and metal–metal/oxygen interaction in the materials [ 19 – 23 ]. It is well established that zinc ferrite is important for its magnetic response [ 6 , 7 , 19 – 23 ]; however, the optical behaviour of this material is equally important from the fundamental and application point of view. Hence, optical studies of zinc ferrite nanoparticles and thin films were carried out using UV–Vis spectroscopy in order to strengthen the understanding of optical absorption in nano dimensions [ 24 – 26 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, local electronic structure and optical behaviour of zinc ferrite thin films on glass substrate

Singh¹,

Lee²,

Lim³

et al. 2018

R. Soc. open sci.

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Zinc ferrite thin films were deposited using a radio-frequency-sputtering method on glass substrates. As-deposited films were annealed at 200°C for 1, 3 and 5 h, respectively. X-ray diffraction studies revealed the amorphous nature of as-grown and annealed films. Thickness of as-deposited film is 96 nm as determined from Rutherford backscattering spectroscopy which remains almost invariant with annealing. Transmission electron microscopic investigations envisaged a low degree of crystalline order in as-deposited and annealed films. Thicknesses estimated from these measurements were almost 62 nm. Roughness values of these films were almost 1–2 nm as determined from atomic force microscopy. X-ray reflectivity measurements further support the results obtained from TEM and AFM. Near-edge X-ray absorption fine structure measurements envisaged 3+ and 2+ valence states of Fe and Zn ions in these films. UV–Vis spectra of these films were characterized by a sharp absorption in the UV region. All films exhibited almost the same value of optical band gap within experimental error, which is close to 2.86 eV.

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Magnetic anisotropy of epitaxial zinc ferrite thin films grown by pulsed laser deposition

Cited by 16 publications

References 20 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

Structural and magnetic properties of zinc ferrite thin films irradiated by 90 keV neon ions

Microstructure, local electronic structure and optical behaviour of zinc ferrite thin films on glass substrate

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