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Induced spin polarization of copper spin 1/2 molecular layers |
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| Authors: | David S Wisbey Danqin Feng J Belot E Vescovo |
| Institution: | a Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588-0111, USA b Department of Physics, 257 Flarsheim Hall, University of Missouri - Kansas City, 5110 Rockhill Road, Kansas City, MO 64110, USA c Department of Chemistry and the Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588-0304, USA d Center for Advanced Microstructures & Devices, 6980 Jefferson Hwy., Baton Rouge, LA 70806, USA e Brookhaven National Laboratory, National Synchrotron Light Source, Upton, NY 11973, USA |
| 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. |
| Keywords: | 75 70 Ak 75 50 Xx 75 20 -g 79 60 -i |
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