What is it about?
A thin film of spinel ferrite is irradiated by the laser beam of a photolitographic machine. The laser spot modifies the irradiated regions in such a manner that bumps or holes appears. The crystallisation and the oxidation states are also modified in the irradiated regions.
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Why is it important?
A way to prepare magnonic or magneto-photonic crystals.
Read the Original
This page is a summary of: Patterned ferrimagnetic thin films of spinel ferrites obtained directly by laser irradiation, Applied Surface Science, October 2013, Elsevier,
DOI: 10.1016/j.apsusc.2013.05.160.
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Resources
Cation migration and coercivity in mixed copper–cobalt spinel ferrite powders
Mixed cobalt copper ferrites in the form of acicular powders. Study of the cationic migrations from coercive force measurmenets.
Cation-Deficient Spinel Ferrites: Application for High-Density Write-Once Optical Recording
Thin films of defect spinel ferrites can be used as write-once read-many media working with blue wavelengths. In fact, because these non-stoichiometric ferrites are metastable, they can be transformed into corundum phases at moderate temperatures by a laser spot. The transformed regions have different optical indices from the starting ferrite film, making the readout process possible. Recording density of about 5 bits/µm2 was demonstrated.
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