title: Self-assembled monolayer-functionalized half-metallic manganite for molecular spintronics.
abstract: (La,Sr)MnO(3) manganite (LSMO) has emerged as the standard ferromagnetic electrode in organic spintronic devices due to its highly spin-polarized character and air stability. Whereas organic semiconductors and polymers have been mainly envisaged to propagate spin information, self-assembled monolayers (SAMs) have been overlooked and should be considered as promising materials for molecular engineering of spintronic devices. Surprisingly, up to now the first key step of SAM grafting protocols over LSMO surface thin films is still missing. We report the grafting of dodecyl (C12P) and octadecyl (C18P) phosphonic acids over the LSMO half-metallic oxide. Alkylphosphonic acids form ordered self-assembled monolayers, with the phosphonic group coordinated to the surface and alkyl chains tilted from the surface vertical by 43° (C12P) and 27° (C18P). We have electrically characterized these SAMs in nanodevices and found that they act as tunnel barriers, opening the door toward the integration of alkylphosphonic acid//LSMO SAMs into future molecular/organic spintronic devices such as spin OLEDs.
authors.affiliation: Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, and Université Paris-Sud, 91405 Orsay, France. sergio.tatay-aguilar@thalesgroup.com
authors.forename: Sergio
authors.initials: S
authors.lastname: Tatay
authors.forename: Clément
authors.initials: C
authors.lastname: Barraud
authors.forename: Marta
authors.initials: M
authors.lastname: Galbiati
authors.forename: Pierre
authors.initials: P
authors.lastname: Seneor
authors.forename: Richard
authors.initials: R
authors.lastname: Mattana
authors.forename: Karim
authors.initials: K
authors.lastname: Bouzehouane
authors.forename: Cyrile
authors.initials: C
authors.lastname: Deranlot
authors.forename: Eric
authors.initials: E
authors.lastname: Jacquet
authors.forename: Alicia
authors.initials: A
authors.lastname: Forment-Aliaga
authors.forename: Pascale
authors.initials: P
authors.lastname: Jegou
authors.forename: Albert
authors.initials: A
authors.lastname: Fert
authors.forename: Frédéric
authors.initials: F
authors.lastname: Petroff
mesh_terms: D003460:Crystallization / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008422:Materials Testing; D008968:Molecular Conformation; D010316:Particle Size; D012666:Semiconductors; D013113:Spin Labels; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D058185:Magnetite Nanoparticles; D013113:Spin Labels