Effect of native defects and Co doping on ferromagnetism in HfO2: First-principles calculations. - Chong Han; Shi-Shen Yan; Xue-Ling Lin; Shu-Jun Hu; Ming-Wen Zhao; Xin-Xin Yao; Yan-Xue Chen; Guo-Lei Liu; Liang-Mo Mei (J. Comput. Chem., 2011)