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Pierre Seneor - Université Paris Sud

Molecular spintronics : from molecules to graphene, new opportunities beyond conventional materials


Spintronics is a paradigm focusing on spin as the information vector in fast and ultra-low-power non volatile devices such as the new STT-MRAM. Beyond its widely distributed application in data storage it aims at providing more complex architectures for beyond CMOS. Very recently, molecular spintronics, a rising research field at the frontier between organic chemistry and spintronics, has opened novel and exciting opportunities in terms of functionalities and performances for spintronics devices. We will show that while graphene has potential for unprecedented highly efficient spin information transport [1], the molecular structure, the local geometry at the molecule-electrode interface and more importantly the ferromagnetic metal/molecule hybridization can strongly influence interfacial spin properties going from spin polarization enhancement to its sign control in spintronics devices [2]. Spin dependent transport measurements on ferromagnet/molecules/ferromagnet magnetic tunnel junctions where molecules are organic semiconductors (Alq3) or self-assembled monolayers [3] highlighting the crucial role of the interface will be presented. In addition we will show that a thin graphene passivation layer can prevent the oxidation of a ferromagnet, enabling its use in novel humide/ambient low-cost processes for spintronics devices for molecular spintronics. We will show that graphene coating doesn’t spoil the highly surface sensitive spin current polarizer/analyzer behavior, but more importantly adds a new enhanced spin filtering property [4].

[1] B. Dlubak Nature Physics 8, 557 (2012) ; Review : P. Seneor MRS Bulletin 37, 1245 (2012)
[2] C. Barraud Nature Physics 6, 615 (2010) ; Review : M. Galbiati MRS Bulletin 39, 602 (2014)
[3] M. Galbiati, Adv. Mater. 24, 6429 (2012) & APL (2015), S. Tatay ACS Nano 6, 8753 (2012),
C. Barraud et al. PRL 114, 206603 (2015)
[4] B. Dlubak ACS Nano 6, 10930 (2012) ; MB Martin ACS Nano 8, 7890 (2014)

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