The activity performed in the framework of an Advanced Research Project funded by INFM will be outlined. A coordinated effort has been produced in order to: obtain bulk magnetic granular solids with controlled particle morphology and interfacial properties; get a detailed knowledge of the role played by magnetic interfaces on the local type and degree of magnetic order and on the spin-dependent electron-scattering processes; study the role of magnetic correlations within an assembly of weakly interacting magnetic nanoparticles on the magnetic properties and on magneto-transport phenomena. Three model systems are being analysed: a) Cu100-xCox alloys prepared either as ribbons by melt spinning and as thick films by sputtering, containing nanometer-sized magnetic particles not simply described by the superparamagnetic model owing to the effect of dipolar magnetic interactions; b) paramagnetic Au100-xFex alloys prepared either by melt-spinning or by solid-state quenching, containing very small transition-metal magnetic clusters typical cluster size: 0.4 nm; typical number of Fe atoms per cluster: 4]; c) Fe-FeO core-shell systems prepared by the Inert-Gas Condensation technique and characterised by a nanometer-sized TM core surrounded by a thin shell of ferrous oxides (either magnetite or maghemite).

Magnetic and magnetotransport properties of bulk granular magnetic systems

BISERO, Diego;RONCONI, Franco;SPIZZO, Federico;VAVASSORI, Paolo;DEL BIANCO, Lucia;
2001

Abstract

The activity performed in the framework of an Advanced Research Project funded by INFM will be outlined. A coordinated effort has been produced in order to: obtain bulk magnetic granular solids with controlled particle morphology and interfacial properties; get a detailed knowledge of the role played by magnetic interfaces on the local type and degree of magnetic order and on the spin-dependent electron-scattering processes; study the role of magnetic correlations within an assembly of weakly interacting magnetic nanoparticles on the magnetic properties and on magneto-transport phenomena. Three model systems are being analysed: a) Cu100-xCox alloys prepared either as ribbons by melt spinning and as thick films by sputtering, containing nanometer-sized magnetic particles not simply described by the superparamagnetic model owing to the effect of dipolar magnetic interactions; b) paramagnetic Au100-xFex alloys prepared either by melt-spinning or by solid-state quenching, containing very small transition-metal magnetic clusters typical cluster size: 0.4 nm; typical number of Fe atoms per cluster: 4]; c) Fe-FeO core-shell systems prepared by the Inert-Gas Condensation technique and characterised by a nanometer-sized TM core surrounded by a thin shell of ferrous oxides (either magnetite or maghemite).
Magnetic granular systems; magnetoresistance; nanostructured metallic phases; dc-magnetron co-sputtering; Inert gas condensation; Small angle neutron scattering
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/1678680
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact