Induced spin polarization of copper spin 1/2 molecular layers

Authors

David Wisbey, University of Nebraska-Lincoln
Ning Wu, University of Nebraska-Lincoln
Danqin Feng, University of Nebraska-Lincoln
A. N. Caruso, University of Missouri – Kansas CityFollow
J. Belot, University of Nebraska-Lincoln
Yaroslav B. Losovyj, Louisiana State University at Baton RougeFollow
Elio Vescovo, Brookhaven National LaboratoryFollow
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

2009

Comments

Published in Physics Letters A 373 (2009) 484–488.

Abstract

Thin films of the metal organic molecule bis(4-cyano-2,2,6,6-tetramethyl-3,5-heptanedionato)copper(II) (or Cu(CNdpm)₂), (C₂₄H₃₆N₂O₄Cu, Cu(II)), deposited on ferromagnetic Co(111) at 40 K, exhibit a finite electron spin polarization. The spin polarization magnitude and sign for Cu(CNdpm)₂ deposited on Co(111) is coverage dependent, but deviates from the mean field expectations for a simple paramagnet on a ferromagnetic substrate. The spin asymmetry is seen to favor select molecular orbitals, consistent with the predicted single molecule density of states. The overlayer polarization observed indicates a strong influence of the ferromagnetic Co(111) substrate and some extra-molecular magnetic coupling.