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MAT2008-06873-C02-02

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SEMICONDUCTORES MAGNETICOS DE GAP ANCHO (ZNM)O (M:CO,MN,FE) Y SUS FASES DE ALTA...

SEMICONDUCTORES MAGNETICOS DE GAP ANCHO (ZNM)O (M:CO,MN,FE) Y SUS FASES DE ALTA PRESION. DEPOSICION E CAPA DELGADA Y PROPIEDADES ESTRUCTURALES Y MAGNETO-OPTICAS ANTECEDENTS THIN FILMS OF WURTZITE ZN1-XMXO (M: TRANSITION METAL) EXHIBITING FERROMAGNETISM AT ROOM TEMPERATURE (RT) ARE AMONG THE MOST PROMISING WIDE GAP MAGNETIC SEMICONDUCTOR FOR SPINTRONIC AND MAGNETOOPTICAL APPLICATIONS, ALON... ver más

01/01/2008

145K€

Presupuesto del proyecto: 145K€

Líder del proyecto

UNIVERSITAT DE VALÈNCIA (ESTUDI GENERAL) No se ha especificado una descripción o un objeto social para esta compañía.

Sin perfil tecnológico

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo AGENCIA ESTATAL DE INVESTIGACIÓN notifico la concesión del proyecto el día 2008-01-01 No tenemos la información de la convocatoria

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Líder del proyecto

UNIVERSITAT DE VALÈNCIA (ESTUDI GENERAL) No se ha especificado una descripción o un objeto social para esta compañía.

Sin perfil tecnológico

Presupuesto del proyecto 145K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto ANTECEDENTS THIN FILMS OF WURTZITE ZN1-XMXO (M: TRANSITION METAL) EXHIBITING FERROMAGNETISM AT ROOM TEMPERATURE (RT) ARE AMONG THE MOST PROMISING WIDE GAP MAGNETIC SEMICONDUCTOR FOR SPINTRONIC AND MAGNETOOPTICAL APPLICATIONS, ALONG THE LAST THREE YEARS MANY RESULTS ON THESE MATERIALS, ONCE EXCLUDED MULTIPHASE SYSTEMS, ARE POINTING TO A NEW TYPE OF DEFECT-RELATED FERROMAGNETISM, IN WHICH THE EXCHANGE BETWEEN THE METAL TRANSITION SPINS WOULD BE MEDIATED BY CARRIERS LOCALIZED IN DONOR DEFECTS WITH 1-2 NM EFFECTIVE BOHR RADIUS, UNDERSTANDING THE PHYSICAL GROUND OF THIS NEW PHENOMENON AND ENVISAGING PRACTICAL APPLICATIONS INVOLVES RESEARCH ON THE ELECTRONIC STRUCTURE OF THESE MATERIALS THROUGH OPTICAL, MAGNETOOPTICAL AND X-RAY SPECTROSCOPY (XAS, RIXS), THE USE OF MAGNETO-OPTICAL AND XAS-RIXS SPECTROSCOPY UNDER HIGH PRESSURE CAN BE A VERY EFFICIENT TOOL IN ORDER TO TEST MODELS OF FERROMAGNETISM TROUGH CONTINUOUS VARIATION OF CRYSTAL AND BAND STRUCTURE PARAMETERS OR THROUGH PHASE TRANSITIONS WITH DIFFERENT ELECTRONIC STRUCTURE AND LOCAL SITE CONFIGURATIONS FOR TRANSITION METAL SPINS, HIGH PRESSURE DENSER PHASES OF ZN1-XMXO ARE INTERESTING BOTH AS NEW MAGNETIC OXIDES AND ALSO BECAUSE OF THEIR SIMILARITY TO GEOPHYSICAL MATERIALS, WHEN ZN IS PARTIALLY REPLACED BY MG, ROCKSALT ZN1-XMXO IS RELATED TO MAGNESIOWUSTITE AND FERRIC SPINEL, AND CAN BE AN USEFUL MODEL TO STUDY RELEVANT GEOPHYSICAL ISSUES AS THE POSSIBLE SPIN CROSSOVER IN THE DEEP EARTH MANTLE,OBJETIVESTHE OBJECTIVES OF THIS PROJECT ARE: 1) THE GROWTH OF THIN FILMS OF TRANSPARENT MAGNETIC SEMICONDUCTOR ALLOYS BASED ON WURTZITE ZNO (ZN1-XMXO) (MT: CO, MN, FE), NON-DOPED OR DOPED WITH DONOR (AL, GA) OR ACCEPTORS (CU), 2) THE GROWTH OF RELATED DENSER PHASES OBTAINED BY HIGH PRESSURE PHASE TRANSITIONS (ROCK-SALT ZN1-XMXO) OR BY THERMAL OXIDATION (ESPECIALLY ZNGA2O4 AND ZNFE2O4 SPINELS), 3) THE INVESTIGATION OF THEIR ELECTRONIC STRUCTURE AND PHYSICAL PROPERTIES INVOLVED IN LUMINESCENT OR MAGNETOOPTICAL APPLICATIONS AN AMBIENT AND HIGH PRESSURE, 4) THE INVESTIGATION OF THE VALIDITY OF MODELS ON DEFECT RELATED MAGNETISM (THROUGH HIGH PRESSURE MODULATION OF THE EFFECTIVE BOHR RADIUS) BY MEANS OF MAGNETOOPTICAL AND XAS-RIXS SPECTROSCOPY,5) THE INVESTIGATION OF PRESSURE INDUCED SPIN TRANSITIONS IN ZN1-XMXO ROCKSALT HIGH PRESSURE PHASES RELATED TO GEOPHYSICAL MATERIALS (FERROPERICLASE/MAGNESIOWUSTITE),METHODS- THIN FILMS WILL BE PREPARED IN AN ULTRAHIGH VACUUM MULTI-TARGET PULSED LASER DEPOSITION SYSTEM, - THIN FILMS AND BULK SAMPLES WILL BE CHARACTERIZED THROUGH DIFFERENT TECHNIQUES AT ROOM PRESSURE: XR DIFFRACTION AND ABSORPTION, ELECTRONIC MICROSCOPY, PHOTOELECTRON SPECTROSCOPY (XPS AND UPS), OPTICAL SPECTROSCOPY (ABSORPTION AND PHOTOLUMINESCENCE), MAGNETO-TRANSPORT (RESISTIVITY, HALL EFFECT AND MAGNETORESISTANCE) AND MAGNETO-OPTICS (MAGNETIC CIRCULAR DICHROISM AND FARADAY EFFECT), - HIGH PRESSURE STUDIES OF WURTZITE ZN1-XMXO, SPINELS AND THEIR HIGH PRESSURE ROCK-SALT PHASES WILL FOCUS ON OPTICAL, MAGNETOOPTICAL AND XANES-EXAFS-RIXS SPECTROSCOPY, Gap ancho\semiconductor magnético diluido\ZnO\metal de transición\capa delgada\estructura local\alta presión\magnetoóptica

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