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|Title: ||High temperature ferromagnetism in Fe-Doped ZnO: a density functional investigation|
|Authors: ||KARMAKAR, D|
|Issue Date: ||2007|
|Publisher: ||JAPAN INST METALS|
|Citation: ||MATERIALS TRANSACTIONS, 48(8), 2119-2122|
|Abstract: ||The electronic structure and related magnetic properties of Fe-doped ZnO system is analyzed in presence of both O- and Zn-vacancy ill the framework of TB-LMTO-ASA method within LSDA. Although for the Fe-doped ZnO system, the ground state is antiferromagnetic, in presence of O-and Zn-vacancy the magnetic mechanism is drastically altered. Utilizing the two-centered tight binding model of Anderson and Hasegawa, we have investigated the nature of the two competing interactions : antiferromagnetic super-exchange versus ferromagnetic double-exchange interactions, as a function of the Fe-Fe separation by supercell calculations. The results reveal that for obtaining long-range half-metallic ferromagnetism, Zn-vacancy is more crucial than O-vacancy.|
|Appears in Collections:||Article|
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