Room-temperature spin glass and near band edge properties of highly disorder (FeCo)_0.03Zn_0.97O and (FeCoNi) _0.03Zn_0.97O nanorods

This paper is intended to give a detailed study of (FeCo) _0.03Zn_0.97O and (FeCoNi)_0.03Zn_0.97O magnetic nanorods, which have been synthesized using a versatile low temperature chemical solution method. The detailed structural and microstructural investigations verify the single hexagonal wurtzite structure of ZnO and rule out the formation of any secondary phase. The Raman study further reveals that the codoped magnetic transition metals are successfully doped into host lattice, while the structure is highly defective and disordered due to random distribution of different codopants. The prepared nanorods exhibit room and low temperatures spin glass magnetic phase arising from the random arrangement of codopants magnetic moments and their exchange interactions at lattice sites of ZnO. The optical investigations of these codoped nanorods show a redshift in near band edge emission, which is possibly raised from the strong s-p and p-d exchange interactions of codopants.