Role of an ultrathin MgO(001) Interlayer in High-Performance CuPc-based Magnetic Tunnel Junctions

Friday, May 19, 2017 - 11:00
Place: 
nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
Who: 
Tae-Hee Kim, Ewha Womens University & IBS Center for Quantum Nanoscience, Seoul, Republic of Korea
Source Name: 
nanoGUNE

In this talk, we will discuss an important role of ultrathin epitaxial MgO(001) interlayer in with high-performance organic spintronic devices. In Si(001) 5 nm MgO(001) 15 nm Fe(001) 1.6 nm MgO(001) tCuPcnm CuPc (tCuPc = 1.2~ 5.0) 25 nm Co magnetic tunnel junctions (MTJs), the strong dependence of spin transport behaviors on barrier thickness, temperature, bias voltage and underlayer indicates the CuPc molecular orientation can affect the magnetoresistive response of the MTJs, which was also clarified by the surface sensitive technique, metastable He atoms de-excitation spectroscopy (MDS). A dependence of adsorption mode of CuPc molecules on the strength of the substrate interaction has been also studied by density functional theory calculations. It is shown that the controlled growth of Cu-phthalocyanine (CuPc) films on an ultra-thin MgO(001) layer is the key factor influencing both spin injection and transport processes.

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