Room-temperature ferromagnetism in Li-dopedp-type luminescent ZnO nanorods | Zendy

Santa Chawla | Zendy; K. Jayanthi | Zendy; R. K. Kotnala | Zendy

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Room-temperature ferromagnetism in Li-dopedp-type luminescent ZnO nanorods

Author(s) -

Santa Chawla,

K. Jayanthi,

R. K. Kotnala

Publication year - 2009

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.79.125204

Subject(s) - curie temperature , ferromagnetism , materials science , paramagnetism , nanorod , condensed matter physics , magnetic moment , magnetic semiconductor , magnetization , doping , physics , nanotechnology , quantum mechanics , magnetic field

We have observed ferromagnetism in Li-doped ZnO nanorods with Curie temperature up to 554 K. Li forms shallow acceptor states in substitutional zinc sites giving rise to p-type conductivity. An explicit correlation emerges between increase in hole concentration with decrease in magnetization and Curie temperature in ZnO:Li. Occurrence of ferromagnetism at room temperature has been established with observed magnetic domain formation in ZnO:Li pellets in magnetic force microscopy and prominent ferromagnetic resonance signal in electron paramagnetic resonance spectrum. Magnetic ZnO:Li nanorods are luminescent, showing strong near UV emission. Substitutional Li atoms can induce local moments on neighboring oxygen atoms, which when considered in a correlated model for oxygen orbitals with random potentials introduced by dopant atom could explain the observed ferromagnetism and high Curie temperature in ZnO:Li nanorods

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