Chawla, Santa and Jayanthi, K. and Kotnala, R. K. (2009) High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods. Journal of Applied Physics, 106 (11). 113923-1-113923-6. ISSN 1089-7550

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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 p-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 Li+/Na+ in cation site induce local magnetic moments on oxygen atoms. Optimum dopant concentrations enable ferromagnetic exchange interaction leading to high Curie temperature.

Item Type: Article
Subjects: Physics
Depositing User: Ms Neetu Chandra
Date Deposited: 03 Sep 2012 07:33
Last Modified: 03 Sep 2012 07:33

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