Microstructural and magnetic investigation of vanadium-substituted Sr-nanohexaferrite

Almessiere, M.A.; Slimani, Y.; Sayed, H.S. El; Baykal, A.; Ercan, I.

doi:10.1016/j.jmmm.2018.09.054

Cited by 89 publications

(14 citation statements)

References 51 publications

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“…Magnetic oxides have been studied at length, and are of great importance from both the scientific and applied standpoint. They include Mn-perovskites, hexaferrites [1,2,3,4,5,6,7,8,9,10], and so on. Among them, pyrochlore oxides denoted by A 2 B 2 O 7 (or A 2 B 2 O 6 O’) have been given much attention due to their rich variety of physical properties [11,12].…”

Section: Introductionmentioning

confidence: 99%

Flat-Band in Pyrochlore Oxides: A First-Principles Study

Hase

Yanagisawa

Kawashima³

2019

Nanomaterials

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Using a first-principles electronic band calculation, we obtained a quasi flat-band near the Fermi level for the six pyrochlore oxides, A2B2O7. These quasi flat-bands are mostly characterized by the s-orbitals of the A-site. The band structures of these oxides are well described by the non-interacting Mielke model. Spin-polarized calculations showed that the ground state of these compounds was ferromagnetic after appropriate carrier doping, despite the absence of the magnetic element.

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Section: Introductionmentioning

confidence: 99%

Flat-Band in Pyrochlore Oxides: A First-Principles Study

Hase

Yanagisawa

Kawashima³

2019

Nanomaterials

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“…The substituted M-type hexaferrites are found to behave in the manners of deep semiconductors and exhibit good magnetic properties, such as the Al-, In- and Ga-doped compounds etc. [17,18,27,28,29]. Furthermore, the large spontaneous polarization and ME coupling at room temperature are also discovered in the M-type hexaferrites doped with the diamagnetic cations [30,31,32].…”

Section: Introductionmentioning

confidence: 99%

A First-Principles Study on the Multiferroic Property of Two-Dimensional BaTiO3 (001) Ultrathin Film with Surface Ba Vacancy

et al. 2019

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In this work, the multiferroic property of Ba-deficient BaTiO3 (001) ultrathin film is studied employing the first-principles approach. The BaTiO3 (001) ultrathin film is more energetically stable and behaves as a semiconductor relative to the (111) and (101) configurations, confirmed from the surface grand potential and electronic density of states. The electronic structures show that the O vacancy can switch the (001) film from a semi-conductor into a metal, while the Ba defect has a slight influence on the band gap, at a concentration of ~2.13%. In Ba-deficient (001) film, the spontaneous polarization pattern is changed and a spontaneous polarization parallel to the surface is observed. Furthermore, a magnetic moment is induced, and it is found to be originated from the O atoms in the supercell. Our results suggest that a strong magnetoelectric coupling occurs because the magnetic moment exhibits a 43.66% drop when the spontaneous polarization increases from 12.84 µC/cm2 to 23.99 µC/cm2 in the deficient BaTiO3 with m = 2 under the bi-axial compress stress field.

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“…Generally, numerous factors can influence the magnetic properties of SrBa HFs. The magnetization (M s and M r ) is largely governed by magnetic moments, bulk density, occupation site of doping ions (i.e., compositions), and presence of secondary phases [32,33]. The most reasonable cause for the increase in the M s values are the magnetic moments of the co-substitutions of Tm 3+ ions (7.5 µ B ) and Sm 3+ ions (1.7 µ B ).…”

Section: Magnetic Investigationsmentioning

confidence: 99%

Impacts of Sol-Gel Auto-Combustion and Ultrasonication Approaches on Structural, Magnetic, and Optical Properties of Sm-Tm Co-Substituted Sr0.5Ba0.5Fe12O19 Nanohexaferrites: Comparative Study

et al. 2020

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In this paper, we introduced a comparative study of Sm-Tm-substituted Sr-Ba nanohexaferrites (NHFs), Sr0.5Ba0.5TmxSmxFe12−2xO19 with x = 0.00–0.05, manufactured via both citrate sol-gel auto-combustion and ultrasonication approaches. The phase formation of M-type hexaferrite (HF) for both compositions was confirmed by X-ray diffraction (XRD) powder pattern, Fourier-transform infrared (FT-IR) spectra, scanning and transmission electron microscopy (SEM and TEM) micrographs, energy dispersive X-ray (EDX) spectra, and elemental mappings. The magnetic properties at room temperature (RT) and low temperature (T = 10 K) were also investigated. M-H loops revealed ferrimagnetic nature for various prepared nanohexaferrites via sol-gel and ultrasonication routes. The Ms (saturation magnetization) and Mr (remanence) values increased with increasing Tm-Sm substituting contents. Ms and Mr reached their maximum values at x = 0.04 in the case of samples prepared using the sol-gel technique and at x = 0.03 for those prepared via ultrasonication route. M-H loops were very broad in samples prepared via ultrasonication route in comparison to those produced by means of the sol-gel approach, implying that the products synthesized via ultrasonication route have greater values of coercivity (Hc). The variations in Hc values with respect to Tm-Sm substitutions were governed by the evolutions in the magneto-crystalline anisotropy. Diffuse reflectance spectra (DRS) were employed to estimate the direct band gap of pristine and co-substituted Sr0.5Ba0.5Fe12O19 hexaferrites. Optical energy band gaps (Eg) of pristine samples were significantly tuned by co-substitution of Tm3+ and Sm3+ ions. Eg values of the Sr0.5Ba0.5Fe12O19 sample, which was synthesized using the sol-gel method, decreased almost linearly from 1.75 to 1.45 eV by increasing co-doped ion content. However, we observed a sharp drop from 1.85 eV to an average of 1.50 eV for the samples, which were synthesized using the ultrasonication approach.

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Microstructural and magnetic investigation of vanadium-substituted Sr-nanohexaferrite

Cited by 89 publications

References 51 publications

Flat-Band in Pyrochlore Oxides: A First-Principles Study

Flat-Band in Pyrochlore Oxides: A First-Principles Study

A First-Principles Study on the Multiferroic Property of Two-Dimensional BaTiO3 (001) Ultrathin Film with Surface Ba Vacancy

Impacts of Sol-Gel Auto-Combustion and Ultrasonication Approaches on Structural, Magnetic, and Optical Properties of Sm-Tm Co-Substituted Sr0.5Ba0.5Fe12O19 Nanohexaferrites: Comparative Study

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