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Single Molecule Magnetoresistance with Combined Antiferromagnetic and Ferromagnetic Electrodes

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journal contribution
posted on 10.10.2012, 00:00 by Alexei Bagrets, Stefan Schmaus, Ali Jaafar, Detlef Kramczynski, Toyo Kazu Yamada, Mébarek Alouani, Wulf Wulfhekel, Ferdinand Evers
The magnetoresistance of a hydrogen-phthalocyanine molecule placed on an antiferromagnetic Mn(001) surface and contacted by a ferromagnetic Fe electrode is investigated using density functional theory based transport calculations and low-temperature scanning tunneling microscopy. A large and negative magnetoresistance ratio of ∼50% is observed in combination with a high conductance. The effect originates from a lowest unoccupied molecular orbital (LUMO) doublet placed almost in resonance with the Fermi energy. As a consequence, irrespective of the mutual alignment of magnetizations, electron transport is always dominated by resonant transmission of Mn-majority charge carries going through LUMO levels.

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