Phase separation and disorder in half metallic ferromagnetic manganite thin films: A theoretical study looking forward low noise nano-devices (Articolo in rivista)

Type
Label
  • Phase separation and disorder in half metallic ferromagnetic manganite thin films: A theoretical study looking forward low noise nano-devices (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Mercone, S; Mechin, L; Perroni, CA; Routoure, JM; di Uccio, US; Maritato, L; Cataudella, V (2007)
    Phase separation and disorder in half metallic ferromagnetic manganite thin films: A theoretical study looking forward low noise nano-devices
    in Progress in Solid State Chemistry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mercone, S; Mechin, L; Perroni, CA; Routoure, JM; di Uccio, US; Maritato, L; Cataudella, V (literal)
Pagina inizio
  • 387 (literal)
Pagina fine
  • 396 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 35 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ENSICAEN, GREYC, UMR 6072, F-14050 Caen, France; Univ Caen, F-14050 Caen, France; KFA Julich GmbH, Forschungszentrum, IFF, D-52425 Julich, Germany; Univ Cassino, Coherentia INFM, I-03043 Cassino, Italy; Univ Cassino, Di MSAT, I-03043 Cassino, Italy; Univ Salerno, Coherentia INFM, I-84081 Baronissi, SA, Italy; Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Baronissi, SA, Italy; Univ Naples Federico 2, Coherentia INFM, I-80126 Naples, Italy; Univ Naples Federico 2, Dipartimento Sci Fisiche, I-80126 Naples, Italy (literal)
Titolo
  • Phase separation and disorder in half metallic ferromagnetic manganite thin films: A theoretical study looking forward low noise nano-devices (literal)
Abstract
  • The resistivity of thin La0.7Sr0.3MnO3 films was first investigated in a wide temperature (T) range (10-750 K). Films grown by different techniques and on several substrates enabled to analyze samples with different amounts of disorder. The aim of this work was to elucidate the nature of the metal-insulator (M-I) transition occur-ring at T= T-p in these films and its relation with the different kinds of inhomogeneities they could present like intrinsic electric disorder and co-existence of two different electrical and/or magnetic phases. The low-temperature resistivity state was described mostly by a law which scales as T-alpha with alpha approximate to 2.5. This supports the theoretical proposal of single magnon scattering in presence of minority spin states localized by the disorder. In the whole range of temperatures the experimental data are found to be consistent with a phase separation (PS) scenario. In order to go through the origin of the characteristic length scale of inhomogeneity found, preliminarily low frequency noise measurements as a function of T in a range of temperature around the M-I transition were made. The samples used were patterned using photolithography into bridges with various widths and lengths. No clear sign of separation phase dynamic has been observed in our noise measurements. Unexpectedly the normalized Hooge parameter alpha(H)/n was found not to be volume (Q) independent. The LSMO electrical properties may strongly be driven by disorder and new design for magnetoresistance sensors may have to take into account their intrinsic PS. (C) 2007 Published by Elsevier Ltd. (literal)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Insieme di parole chiave di
data.CNR.it