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For grain boundaries (GBs) in metals it is very well known that the character of the GB distribution, i.e. misorientation and orientation, can drastically change the properties of polycrystals. Straumal et al. (pp. 1581–1586) compare the magnetic properties of nanograined ZnO films with the same grain size but with different character of GB distribution. Pure and doped ZnO can become ferromagnetic...
The pure ZnO thin films were deposited by the wet chemistry (‘liquid ceramics’) method from the butanoate precursors on the single‐crystalline (102) sapphire substrates. The films annealed in air (550 °C, 24 h) after butanoate pyrolysis have pronounced texture, and they reveal the ferromagnetic behaviour. Argon annealed films (650 °C, 30 min) exhibit randomly oriented grains, where the ferromagnetism...
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