Inter-grain effects on the magnetism of M-type strontium ferrite

Céspedes, Eva; Rodríguez-Rodríguez, G.; Navío, Cristina; Osorio, Manuel; Guerrero, Rubén; Pedrosa, Francisco J.; Mompeán, F. J.; Garcı́a-Hernández, M.; Fernández, J.F.; Quesada, A.; Camarero, Julio; Bollero, A.

doi:10.1016/j.jallcom.2016.08.318

Cited by 9 publications

(7 citation statements)

References 40 publications

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“…It also has an unusual bipyramidal Fe site (2b), coupled ferromagnetically to the majority of octahedral sites. As in other M-ferrites the easy axis lies along the c-axis 5–7 . It presents a high magnetocrystalline anisotropy of K U = 3.6 · 10 5 Jm −3 8 .…”

Section: Introductionmentioning

confidence: 64%

“…The hexagonal platelet geometry was taken from the experimental images. The material constants employed for the saturation magnetization, exchange stiffness and magnetocrystalline hexagonal anisotropy were M s = 3.8 · 10 5 Am −1 , A s = 6 · 10 −12 Jm −1 and K U = 3.6 · 10 5 Jm −3 , respectively 3,7,62 .…”

Section: Methodsmentioning

confidence: 99%

“…Several methods have been used to prepare strontium ferrite such as solid-state synthesis, physical vapour deposition, ball milling, sol-gel and chemical coprecipitation 7,12–17 . In particular, hydrothermal methods can provide highly crystalline micrometer sized platelets 18–20 .…”

Section: Introductionmentioning

confidence: 99%

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Strontium hexaferrite platelets: a comprehensive soft X-ray absorption and Mössbauer spectroscopy study

Soria

Jenuš

Marco

et al. 2019

Sci Rep

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Platelets of strontium hexaferrite (SrFe 12 O 19 , SFO), up to several micrometers in width, and tens of nanometers thick have been synthesized by a hydrothermal method. They have been studied by a combination of structural and magnetic techniques, with emphasis on Mössbauer spectroscopy and X-ray absorption based-measurements including spectroscopy and microscopy on the iron-L edges and the oxygen-K edge, allowing us to establish the differences and similarities between our synthesized nanostructures and commercial powders. The Mössbauer spectra reveal a greater contribution of iron tetrahedral sites in platelets in comparison to pure bulk material. For reference, high-resolution absorption and dichroic spectra have also been measured both from the platelets and from pure bulk material. The O-K edge has been reproduced by density functional theory calculations. Out-of-plane domains were observed with 180° domain walls less than 20 nm width, in good agreement with micromagnetic simulations.

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Section: Introductionmentioning

confidence: 64%

Section: Methodsmentioning

confidence: 99%

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Strontium hexaferrite platelets: a comprehensive soft X-ray absorption and Mössbauer spectroscopy study

Soria

Jenuš

Marco

et al. 2019

Sci Rep

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“…Under these conditions, series of samples were grown with varying sputtering powers (140 W to 260 W). Post-deposition annealing was performed in air, at 850 • C during 3 hours [22,23,24]. The determination of the SrFe 12 O 19 films thickness was done by a Veeco Dektak 150 Profilometer and their surface morphology was analyzed by Atomic Force Microscopy (AFM, Molecular Imaging) in tapping mode.…”

Section: Experimental Methodsmentioning

confidence: 99%

Influence of the growth conditions on the magnetism of SrFe$_{12}$O$_{19}$ thin films and the behavior of Co / SrFe$_{12}$O$_{19}$ bilayers

Soria,

Marco,

Mandziak

et al. 2020

Preprint

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SrFe 12 O 19 (SFO) films grown on Si (100) substrates by radio-frequency magnetron sputtering have been characterized in terms of composition, structural and magnetic properties by a combination of microscopy, diffraction and spectroscopy techniques. Mössbauer spectroscopy was used to determine the orientation of the films magnetization, which was found to be controlled by both the sputtering power and the thickness of the films. Additionally, the coupling between the SFO films and a deposited cobalt overlayer was studied by means of synchrotron-based spectromicroscopy techniques. A structural coupling at the SFO/Co interface is suggested to account for the expetimental observations. Micromagnetic simulations were performed in order to reproduce the experimental behaviour of the system.

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“…Despite being the cheapest mass-market solution for years, the magnetic coating technology still requires further progress in optimizing the production pathways while retaining the high quality of the resulting medium. − To date, most of the efforts in technological improvement concern physical vapor deposition (PVD) of textured hexaferrite phases. ,, However, with PVD, crystal growth kinetics are limited by the deposition rate and post-treatment duration, slowing the tape spooling conveyor during processing. Sputter deposition provides in-plane texturing in the absence of any crystallographic relation of newly formed phases to the underlying substrates. , It diminishes an effective coercive force of the magnetic layer and results in spontaneous remagnetization of the adjacent grains …”

Section: Introductionmentioning

confidence: 99%

Sprayed Nanometer-Thick Hard-Magnetic Coatings with Strong Perpendicular Anisotropy for Data Storage Applications

Chumakov

Brett

Gordeyeva

et al. 2022

ACS Appl. Nano Mater.

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The rapid growth of digital information in the world necessitates a big leap in improving the existing technologies for magnetic recording. For the best modern perpendicular recording, the highest coercivity materials with minimal volume are required. We present a study of a facile technology for establishing mono- and multilayer surfaces from various single-domain flat magnetic nanoparticles that exhibit a strong perpendicular-oriented magnetic moment on solid and flexible substrates. Surfactant-free, hard ferromagnetic, and single-domain anisotropic strontium hexaferrite SrFe12O19 nanoparticles with a perpendicular magnetic moment orientation and two different aspect ratios are self-ordered into magnetic thin nanofilms, exploiting the templating effect of cellulose nanofibrils and magnetic fields. Uniform magnetic coatings obtained by the scalable layer-by-layer spray deposition from a monolayer coverage up to thicknesses of a few tens of nanometers show a preferred in-plane orientation of the hard-magnetic nanoparticles. High coercivities of the films of up to 5 kOe and a high perpendicular anisotropy of M r⊥/M s > 80% are found. The application of the magnetic field during film deposition ensures additional improvement in perpendicular magnetic anisotropy and the appearance of residual magnetization in the film of up to 0.6M s. For low-aspect-ratio nanoparticles stacked in periodic planar structures, the signs of the photonic band gap are revealed. The ability to create scalable, thin magnetic structures based on nanosized particles/building blocks opens great opportunities for their application in a wide variety of optoelectronic and magnetic storage devices.

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Inter-grain effects on the magnetism of M-type strontium ferrite

Cited by 9 publications

References 40 publications

Strontium hexaferrite platelets: a comprehensive soft X-ray absorption and Mössbauer spectroscopy study

Strontium hexaferrite platelets: a comprehensive soft X-ray absorption and Mössbauer spectroscopy study

Influence of the growth conditions on the magnetism of SrFe$_{12}$O$_{19}$ thin films and the behavior of Co / SrFe$_{12}$O$_{19}$ bilayers

Sprayed Nanometer-Thick Hard-Magnetic Coatings with Strong Perpendicular Anisotropy for Data Storage Applications

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