Sommaire:

Spintronics intends to further develop electronic systems with the aim of reducing energy consumption while maintaining growing performances. In this framework, 2D oxide materials are a promising platform offering model properties ranging from high-k 2D dielectrics [1] to 2D ferroelectrics [2] or 2D ferromagnets [3] while being intrinsically air stable, an overall key asset for 2D spintronics. This presentation focuses on the development of 2D-TFCO (Ti0.8−x/4Fex/2Co0.2−x/2O2) doped-titanate oxide nanosheets, an original 2D oxide stable in ambient atmosphere with ferromagnetic properties at room temperature [3]. TFCO oxide nanosheets are produced via the exfoliation of the bulk layered parent oxide KTFCO (K0.4Ti0.8−x/4Fex/2Co0.2−x/2O2), synthesized by solid-state chemistry methods. The optimization of synthesis parameters has led to the growth of millimetric KTFCO single crystals suitable for bulk properties analysis prior to the exfoliation of large area TFCO nanosheets. Latest results on KTFCO crystals characterizations will be presented, especially their magnetic properties with Curie point above room temperature. Structural properties of the layered phase will also be presented. Exfoliation of KTFCO crystals into TFCO-nanosheets will be demonstrated as a first step towards the integration of this 2D ferromagnetic insulator as a functional material in spintronics heterostructures. Finally, a specific focus will be dedicated to the investigation of the electronic, magnetic, transport and magneto-transport properties of 2D-TFCO single and multilayers. [1] M. Osada, T. Sasaki. (2012) Adv. Mater. 2, 2LF-228. [2] B.W. Li et al., (2017) J. Am. Chem. Soc. 31, LF868-LF874. [3] M. Osada et al. (2014) Nanoscale 6, 14227–14236.

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