Abstract
Based on an Anderson-like model including the electron-lattice interaction and a Hubbard term, the ground-state properties of metal/organic-ferromagnet heterojunctions are investigated. Both the nonmagnetic and ferromagnetic metals are considered. The results reveal a picture of electron injection and the induced excitations in the organic ferromagnets, which is divided into two regimes with the increase of injected electrons: the first solitonlike interfacial state and the subsequent coexistence of the interfacial state and polaron states. The interfacial state is further explored by the shallow states and localized wave functions with the analysis of the molecular self-consistent Hamiltonian. In the case of the ferromagnetic metal, the effect of the magnetization orientation alignment between the metal and the organic ferromagnet is discussed, where the lowest injection barrier is found when the magnetization orientations of the two components are parallel. An injection-induced degradation of the magnetism of the organic ferromagnet is also obtained. This paper provides a basic understanding of the metal/organic-ferromagnet interface, which is essential for further spintronic study in organic ferromagnetic devices.
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