A combined experimental and computational study was carried out to investigate magnetic properties of NiO nanostructures. Remarkable size-dependent magnetism was discovered. Uniform amorphous NiO showed a dominated antiferromagnetic interaction and an ordering temperature of 3.5 K. NiO clusters ͑up to 1 nm͒ tend to be ferromagnetic interaction with an ordering temperature of 35 K, accompanied by high magnetization ͑105 emu/ g͒ and a spin-glass behavior. NiO nanocrystals ͑Ͼ2 nm͒ were found to be antiferromagnetic with uncompensated surface magnetization and shifted hysteresis due to the core-shell interactions.

ZnO wires are prepared from the oxidation of Zn wires, which are electrodeposited into AAO template. The ZnO wires show ferromagnetism at room temperature. A detailed study indicates that, owing to incomplete oxidation, Zn clusters embedded in the ZnO matrix may attribute to the room‐temperature ferromagnetism.

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