Room temperature p-induced surface ferromagnetism
  We prove a spontaneous magnetization of the oxygen-terminated ZnO (0001) surface by utilizing a multi-code, SIESTA and KKR, first-principles approach, involving both LSDA+U and selfinteraction corrections (SIC) to treat electron correlation effects. Critical temperatures are estimated from Monte Carlo simulations, showing that at and above 300 K the surface is thermodynamically stable and ferromagnetic. The observed half-metallicity and long-range magnetic order originate from the presence of p-holes in the valence band of the oxide. The mechanism is universal in ionic oxides and points to a new route for the design of ferromagnetic low dimensional systems. 
Guntram Fischer, Nadiezhda Sanchez, Waheed A. Adeagbo, Martin   L\"uders, Zdzislawa Szotek, Walter M. Temmerman, Arthur Erns...
cond-mat.mtrl-sci cond-mat.other