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.
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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.
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Synthesized stable water suspensions of manganese perovskites magnetic nanoparticles of the composition La1-xSrxMnO3 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.
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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