Comment on “Theoretical Description of Carrier Mediated Magnetism in Cobalt Doped ZnO”
نویسندگان
چکیده
منابع مشابه
Theoretical description of carrier mediated magnetism in cobalt doped ZnO.
Substitutional cobalt in ZnO has a weak preference for antiferromagnetic ordering. Stabilization of ferromagnetism is achieved through n-type doping, which can be understood through a band coupling model. However, the description of the transition to a ferromagnetic ground state varies within different levels of band theory; issues arise due to the density functional theory underestimation of t...
متن کاملComment on "theoretical description of carrier mediated magnetism in cobalt doped ZnO".
In this Comment, we question the electron-mediated mechanism for magnetic coupling in Co-doped ZnO recently proposed by Walsh, Da Silva, and Wei [1]. Such a mechanism is based on density functional theory (DFT) calculations within aDFTþUdþUs approach. Within this approach, Walsh, Da Silva, and Wei introduce ad hoc corrections in order to fit the calculated band structure to what they believe is...
متن کاملRoom Temperature Ferromagnetism in Cobalt Doped ZnO Nanoparticles
In this work we report synthesis and magnetic characterization of cobalt doped ZnO nanoparticles (with different percent of doped cobalt oxide). Synthesis of the materials was carried out at room temperature by polyacrylamide-gel method, using zink sulfate and cobalt nitrate as source materials, acrylamide as monomer and N,N-methylene bisacrylamide as a lattice reagent. Characterization of the ...
متن کاملRoom Temperature Ferromagnetism in Cobalt Doped ZnO Nanoparticles
In this work we report synthesis and magnetic characterization of cobalt doped ZnO nanoparticles (with different percent of doped cobalt oxide). Synthesis of the materials was carried out at room temperature by polyacrylamide-gel method, using zink sulfate and cobalt nitrate as source materials, acrylamide as monomer and N,N-methylene bisacrylamide as a lattice reagent. Characterization of the ...
متن کاملThermodynamics of carrier-mediated magnetism in semiconductors.
We propose a model of carrier-mediated ferromagnetism in semiconductors that accounts for the temperature dependence of the carriers. The model permits analysis of the thermodynamic stability of competing magnetic states, opening the door to the construction of magnetic phase diagrams. As an example, we analyze the stability of a possible reentrant ferromagnetic semiconductor, in which increasi...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2009
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.102.159701