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MA: Fachverband Magnetismus

MA 10: Spinelectronics/Spininjection in Heterostructures

MA 10.4: Vortrag

Montag, 26. März 2007, 16:00–16:15, H23

First-principles studies on co-doping effects in dilute magnetic semiconductors — •Sanjeev Kumar Nayak¹, Markus Ernst Gruner¹, Hisazumi Akai², and Peter Entel¹ — ¹Physics Department, University of Duisburg-Essen, Duisburg Campus, 47048 Duisburg, Germany — ²Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan

Dilute magnetic semiconductors are a special class of materials that have high spin polarization at the Fermi level, and hence are promising materials for spintronics applications. The occurrence of room temperature ferromagnetism in these materials makes it interesting for practical applications. Recently, giant magnetic moments per dopant atom in experiments for Co doped ZnO [1] and the Gd doped GaN [2] were observed. We present theoretical studies for Co doped ZnO and Gd doped GaN done using the density functional theory together with the PAW method using Vienna ab-initio simulation package. We explore co-doping with other elements like N and Al to study the influence of defects. Furthermore, transport calculations of these systems using the KKR-CPA-LDA aproach are presented.
  [1] C. Song et al., Phys. Rev. B, 73, 024405 (2006)
  [2] S. Dhar et al., Appl. Phys. Lett. 89, 062503 (2006)