Fyzikální ústav Akademie věd ČR

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Selected results of department 24

Electron magnetic circular dichroism – new method in spectroscopy of nanomagnetics

Fast progress in miniaturization of electronic devices requires new approach not only in the technology, producing nanometric and subnanometric objects, but also in their characterization. EMCD – electron magnetic circular dichroism represents a new method, which uses the electron transmission microscope to determine the magnetic moments of atoms from which consists the object investigated. The full text >>

Simultaneous spin and metal-insulator transition in transition metal compounds

In many magnetic materials it is possible to change the size of the magnetic moments, typically reduce, by application of pressure. Such transition is usually abrupt and sometimes is accompanied transtion to a metallic state. Using the LDA+DMFT computational scheme we were able to obtain such a behavior in MnO and Fe₂O₃ in agreement with experimental observations. We have identified the microscopic mechanisms responsible for these transitions and explained the observed changes in the density of the materials accompanying the transition. The full text >>

Applications of hybride magnetic nanoparticles in medicine and biology

Synthesized stable water suspensions of manganese perovskites magnetic nanoparticles of the composition La_1-xSr_xMnO₃ of advantageous properties markedly exceeding the behaviour of the existing commercial products on the basis of iron oxides. They afford higher heating efficiency and simultaneously controlled heating excluding the local overheating risk of a health tissue.

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Spin transitions in cobaltites

The result of our research is an unified description of the magnetic and electric transitions in cobaltites LnCoO₃ (Ln = La, Y, rare earths), associated with thermally activated changes of the spin state of the octahedrally coordinated Co³⁺ ions, and the determination of the polaron character of the hole and electron carriers in doped cobaltites.
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