Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.44: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Semiconducting (Half-Metallic) Ferromagnetism in Mn(Fe) Substituted Pt and Pd Nitrides — •Abdeslam Houari¹, Samir Matar², and Volker Eyert³ — ¹Theoretical Physics Laboratory, Department of Physics, University of Bejaia, Bejaia 06000. Algeria — ²ICMCB, CNRS, Université de Bordeaux 1, 87 avenue du Docteur Albert Schweitzer, 33600, Pessac, France — ³Center for Electronic Correlations and Magnetism, Institut Fur Physik, Universitat Augsburg, 86135 Augsburg, Germany

Using first principles calculations as based on density functional theory, we propose a class of so far unexplored diluted ferromagnetic semiconductors and half-metals. Here, we study the electronic properties of recently synthesized 4d and 5d transition metal dinitrides. In particular, we address Mn- and Fe-substitution in PtN₂ and PdN₂. Structural relaxation shows that the resulting ordered compounds, Pt_0.75(Mn,Fe)_0.25N₂ and Pd_0.75(Mn,Fe)_0.25N₂, maintain the cubic crystal symmetry of the parent compounds. On substitution, all compounds exhibit long-range ferromagnetic order. While both Pt_0.75Mn_0.25N₂ and Pd_0.75Mn_0.25N₂ are semiconducting, Fe-substitution causes half-metallic behavior for both parent materials.