Antiferromagnetic coupling of Cr-porphyrin to a bare Co substrate

Jung, Thomas A.; Wackerlin, Christian; Siewert, Dorota; Wckerlin, Aneliia; Kleibert, Armin; BALLAV, NIRMALYA; Tarafder, Kartick; Oppeneer, Peter M.; Girovsky, Jan; Nowakowski, Jan; Hahlen, Tatjana

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Antiferromagnetic coupling of Cr-porphyrin to a bare Co substrate

Girovsky, Jan; Tarafder, Kartick; Wackerlin, Christian; Nowakowski, Jan; Siewert, Dorota; Hahlen, Tatjana; Wckerlin, Aneliia; Kleibert, Armin; BALLAV, NIRMALYA; Jung, Thomas A.; Oppeneer, Peter M.

URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1943 https://doi.org/10.1103/PhysRevB.90.220404 Date: 2014-12

Abstract:

We report the discovery of an antiferromagnetic coupling of the magnetic moment of chromium(II) tetraphenyl-porphyrin (CrTPP) molecules to the magnetization of the clean ferromagnetic Co(001) substrate. We assign this unusual molecule-substrate exchange coupling to the less than half-filled chromium 3dorbitals interacting with Co valence band electrons via porphyrin-ligand molecular orbitals. X-ray magnetic circular dichroism, x-ray photoelectron spectroscopy, and scanning tunneling microscopy are combined with DFT+Ucalculations and provide evidence for a surprising type of antiferromagnetic 90?indirect magnetic exchange coupling.

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