Ferromagnetic coupling in a Co-doped graphenelike ZnO sheet

T. M. Schmidt, R. H. Miwa, and A. Fazzio
Phys. Rev. B 81, 195413 – Published 7 May 2010

Abstract

Using first-principles calculations it is demonstrated that Co doped graphenelike ZnO sheet presents ferromagnetic coupling. The Co atoms are energetically barrierless absorbed in the Zn sites, suffering a Jahn-Teller distortion. The results reveal that the origin of the ferromagnetic coupling, different from the bulk 3D ZnO stacking, is mainly guided by a direct exchange interaction without any additional defect. This ferromagnetic coupling is due to the system topology, namely, it is a direct consequence of the two-dimensional character of the ZnO monolayer within graphenelike structure. Increasing the number of ZnO layers the ferromagnetic coupling vanishes.

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  • Received 3 March 2010

DOI:https://doi.org/10.1103/PhysRevB.81.195413

©2010 American Physical Society

Authors & Affiliations

T. M. Schmidt1, R. H. Miwa1, and A. Fazzio2

  • 1Instituto de Física, Universidade Federal de Uberlândia, Caixa Postal 593, CEP 38400-902, Uberlândia, Minas Gerais, Brazil
  • 2Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970, São Paulo, SP, Brazil

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Issue

Vol. 81, Iss. 19 — 15 May 2010

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