期刊
ACS NANO
卷 6, 期 10, 页码 8753-8757出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn302458z
关键词
molecular spintronics; self-assembled monolayers; surface functionalization; phosphonic acids; perovskytes; LSMO
类别
资金
- Institut Universitaire de France
- Spanish MINECO
- NANOCON [FP7/2007-2013-252757]
- European Union Seventh Framework Programme [263104]
- ANR agency [MELAMIN 2011-NANO-021]
(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 degrees (C12P) and 27 degrees(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.
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