Role of an ultrathin MgO(001) Interlayer in High-Performance CuPc-based Magnetic Tunnel Junctions
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Role of an ultrathin MgO(001) Interlayer in High-Performance CuPc-based Magnetic Tunnel Junctions
CIC nanoGUNE Seminars
- Speaker
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Tae-Hee Kim, Ewha Womens University & IBS Center for Quantum Nanoscience, Seoul, Republic of Korea
- When
-
2017/05/19
13:00
- Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
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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.