Interface effects on an ultrathin Co film in multilayers based on the organic semiconductor Alq3

Physics – Condensed Matter – Materials Science

Scientific paper

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4 pages, Accepted for publication in Applied Physics Letters

Scientific paper

10.1063/1.3505495

The effect of the AlOx barrier thickness on magnetic and morphological properties of Ta/Co/(AlOx)/Alq3/Si hybrid structures was systematically studied by means of atomic force microscopy, SQUID magnetometry and nuclear magnetic resonance (NMR). All used techniques pointed out that the barrier thickness of 2 nm is required to obtain a magnetically good cobalt layer on top of Alq3. 59Co NMR measurements revealed that the AlOx barrier gives rise to the formation of an interface layer with "defective" cobalt favouring growth of "bulk" cobalt with good magnetic properties.

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