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Magnetic Interactions of Vanadyl Phthalocyanine with Ferromagnetic Iron, Cobalt, and Nickel Surfaces

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journal contribution
posted on 07.08.2014, 00:00 by Keitaro Eguchi, Yasumasa Takagi, Takeshi Nakagawa, Toshihiko Yokoyama
We have investigated the molecular orientation and magnetic properties of vanadyl phthalocyanine (VOPc) deposited on ferromagnetic Fe, Co, and Ni films, which were epitaxially grown on Cu(001) using X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The results reveal that the VOPc framework lies flat on the surfaces with oxygen-up configurations. The spin of the central V atoms in VOPc is antiferromagnetically coupled with those of Fe or Co atoms in the ferromagnetic surface. In contrast, the magnetic coupling between V and Ni is not effective, exhibiting simple paramagnetism of VOPc.