Tailoring the nature of magnetic coupling of Fe-porphyrin molecules to ferromagnetic substrates

Authors

M. Bernien, Freie Universität Berlin
J. Miguel, Freie Universität Berlin
C. Weis, Universität Duisburg-Essen
Md E. Ali, Uppsala Universitet
J. Kurde, Freie Universität Berlin
B. Krumme, Universität Duisburg-Essen
P. M. Panchmatia, Uppsala Universitet
B. Sanyal, Uppsala Universitet

Abstract

We demonstrate that an antiferromagnetic coupling between paramagnetic Fe-porphyrin molecules and ultrathin Co and Ni magnetic films on Cu(100) substrates can be established by an intermediate layer of atomic oxygen. The coupling energies have been determined from the temperature dependence of x-ray magnetic circular dichroism measurements. By density functional theory+U calculations the coupling mechanism is shown to be superexchange between the Fe center of the molecules and Co surface-atoms, mediated by oxygen. © 2009 The American Physical Society.

Publication Title

Physical Review Letters

Recommended Citation

Bernien, M., Miguel, J., Weis, C., Ali, M., Kurde, J., Krumme, B., Panchmatia, P., & Sanyal, B. (2009). Tailoring the nature of magnetic coupling of Fe-porphyrin molecules to ferromagnetic substrates. Physical Review Letters (4) https://doi.org/10.1103/PhysRevLett.102.047202