Self-Assembled Monolayer-Functionalized Half-Metallic Manganite for Molecular Spintronics
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- 作者：Sergio Tatay ; Cl茅ment Barraud ; Marta Galbiati ; Pierre Seneor ; Richard Mattana ; Karim Bouzehouane ; Cyrile Deranlot ; Eric Jacquet ; Alicia Forment-Aliaga ; Pascale Jegou ; Albert Fert ; Fr茅d茅ric Petroff
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：October 23, 2012
- 年：2012
- 卷：6
- 期：10
- 页码：8753-8757
- 全文大小：301K
- 年卷期：v.6,no.10(October 23, 2012)
- ISSN：1936-086X
文摘
(La,Sr)MnO3 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掳 (C12P) and 27掳 (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.