Recent efforts in developing spintronic and magneto-optoelectric material for applications have relied on the use of magnetic semiconductors doped with transition metals and have met with limited success. Using a fresh synthesis approach using alkali ions we demonstrate that alkali doped zinc oxide can provide high temperature magnetic semiconductors. We report studies on nanocrystalline powder and pellets of -type ZnO:Li and ZnO:Na that exhibit ferromagnetism up to 554 K. The ferromagnetic behavior was confirmed from magnetic hysteresis, ferromagnetic resonance, magnetic force microscopy, and explained by a model where substitutional in cation site induce local magnetic moments on oxygen atoms. Optimum dopant concentrations enable ferromagnetic exchange interaction leading to high Curie temperature.
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Research Article| December 15 2009
High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods
Santa Chawla, K. Jayanthi, R. K. Kotnala; High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods. J. Appl. Phys. 1 December 2009; 106 (11): 113923. https://doi.org/10.1063/1.3261722
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