6533b7d6fe1ef96bd1265cdb
RESEARCH PRODUCT
Self-Assembled Monolayer-Functionalized Half-Metallic Manganite for Molecular Spintronics
Karim BouzehouanePascale JégouCyrile DeranlotAlicia Forment-aliagaFrédéric PetroffAlbert FertMarta GalbiatiRichard MattanaSergio TatayPierre SeneorClément BarraudEric Jacquetsubject
Materials scienceMacromolecular SubstancesSurface PropertiesMolecular ConformationGeneral Physics and AstronomyNanotechnology02 engineering and technology010402 general chemistry01 natural sciencesMaterials TestingMonolayerGeneral Materials ScienceParticle SizeThin filmMagnetite NanoparticlesAlkylchemistry.chemical_classificationSpintronicsGeneral EngineeringSelf-assembled monolayer021001 nanoscience & nanotechnologyManganite0104 chemical sciencesOrganic semiconductorSemiconductorschemistrySurface modificationSpin LabelsCrystallization0210 nano-technologydescription
(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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-09-06 | ACS Nano |