Cation-Deficient Spinel Ferrites: Application for High-Density   Write-Once Optical Recording

Bouet, L.; Tailhades, Philippe; Pasquet, Isabelle; Bonningue, Corine; Brun, Stéphane Le; Rousset, A.

doi:10.1143/jjap.38.1826

Cited by 13 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 6 J. m −2 from Danezan et al (2018)). Very high temperatures or local melting have also been achieved by diode laser heating of γ Fe 2 O 3 films or oxalate layers, according to the work of Bouet et al (1999) and Pasquet et al (2017). For the samples obtained at the lowest laser powers, the high porosity within the zones consisting mainly of oxides (Figs.…”

Section: Discussionmentioning

confidence: 99%

A multimaterial based on metallic copper and spinel oxide made by powder bed laser fusion: A new nanostructured material for inert anode dedicated to aluminum electrolysis

Pasquet

Baco-Carles

Chamelot

et al. 2020

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Coherent 3D parts of cermets, made of spinel ferrite and metallic copper, are prepared in a nitrogen atmosphere by powder bed additive manufacturing of a mixture of oxide and metallic powders. The cermets obtained are constituted by the association of blocks of about 500 µm, which create between them, a relatively large porosity (# 35%). Each block is subdivided into inti mately nested wnes that are either predominantly metallic or pre dominantly oxide type. ln the metal parts, a dispersion of oxide crystals is observed, whose siz.e varies from ten nanometers to a few micrometers. A similar distribution of metal particles in the oxide zones is also demon strated. The chemical compositions of metallic and oxide phases are slightly different from those in the initial powders. Due to the high energy density of the laser, the melting temperature of the metal and oxides could be reached and therefore this could explain the chemical composition variations in the phases and the shape of oxide and metallic nanometric grains. The process used can therefore be described as powder bed fusion. These nanostructured cermets have been used as 'înert" anodes for the electrolysis of aluminum in molten cryolite. Although penalized by a high porosity, 5 mm in diameter anodes allowed to carry out an electrolysis for 4 h. Sinoe Spark Plasma Sintering can greatly reduoe their porosity, while retaining their specifi c microstructure, the implementation of additive manufacturing for producing "inert" anodes is therefore of real interest

show abstract

Section: Discussionmentioning

confidence: 99%

A multimaterial based on metallic copper and spinel oxide made by powder bed laser fusion: A new nanostructured material for inert anode dedicated to aluminum electrolysis

Pasquet

Baco-Carles

Chamelot

et al. 2020

Journal of Materials Processing Technology

View full text Add to dashboard Cite

show abstract

“…Optical memory technologies vary greatly in mechanism and in need addressed. Examples from an enormous literature include cation-de®cient spinel ferrites for high-density, write-once, read many times systems [31] and stoichiometric LiTaO 3 for near-UV dynamic holography [32], where electron transfer processes are involved.…”

Section: Changing Colour Adhesion and Passivationmentioning

confidence: 99%

Materials modification by electronic excitation

Stoneham¹,

Itoh

2001

Radiation Effects and Defects in Solids

120

105

View full text Add to dashboard Cite

Electronic excitation by lasers or electron beams can modify the properties of materials. The changes are not just due to heat, nor do they result from the well-known collision dynamics of much radiation damage. Everyday examples of modi®cation by electronic excitation include photography, and photochromics (such as sunglasses) which change colour. In the last few years it has become clear that excitation can offer novel types of modi®cation, with better-controlled changes. The ®eld has evolved through a mix of basic science, of new laser and electron beam tools, and of new needs from microelectronics, photonics and nanotechnology. Underlying this development are some common themes which integrate the basic science and its applications. These include especially the ideas of energy localisation and charge localisation. There are detailed comparisons of experiment and theory for halides, but there is a wealth of information for other materials. From this, we identify ways to connect understanding to technological needs, like selective removal of material, controlled changes, altering the balance between process steps, and possibilities of quantum control. The ®eld is reviewed in full in our recent book [N. Itoh, A.M. Stoneham, Materials Modi®cation

show abstract

“…Following that, in the nineteenth and twentieth centuries, the Bohr model of the atom and the Dirac hypothesis explained the circulation of currents in atoms. Weiss introduced the next domains theory to explain ferromagnetic behaviour [37]. Neel proposed the next radical approach.…”

Section: Introductionmentioning

confidence: 99%

Basics of Ferrites: Types and Structures

Dhiman

Rana

Goyal

et al. 2021

Engineering Materials

View full text Add to dashboard Cite

This chapter summarizes the detailed introduction, types of magnetism, classifications of ferrites and their crystal structure. In addition, this chapter has the main focus on the magnetic properties possessed by ferrites on the basis of the soft and hard nature of ferrite materials. This chapter summarizes the recent work on the magnetic and dielectric properties of ferrites. Ferrites are primarily known for their high resistivity and highly magnetic nature which makes them suitable material over a wide range of applications like magnetic storage devices, antennas, transformers and other high-frequency devices. A great benefit of ferrites nanoparticles is the porosity, mandatory for sensor applications too. In short, ferrites belong to the materials which are a potential candidate for widely spread applications.

show abstract

Cation-Deficient Spinel Ferrites: Application for High-Density Write-Once Optical Recording

Cited by 13 publications

References 2 publications

A multimaterial based on metallic copper and spinel oxide made by powder bed laser fusion: A new nanostructured material for inert anode dedicated to aluminum electrolysis

A multimaterial based on metallic copper and spinel oxide made by powder bed laser fusion: A new nanostructured material for inert anode dedicated to aluminum electrolysis

Materials modification by electronic excitation

Basics of Ferrites: Types and Structures

Contact Info

Product

Resources

About