Ferromagnetic behavior in Zn(Mn, P)O thin films

We present magnetic properties of Zn(Mn, P)O thin films, with 5 at% Mn, epitaxially grown by pulsed laser deposition in oxygen atmosphere on a-plane sapphire substrates. Ferromagnetism above room temperature was obtained for films with 0.1 at% P, grown at around 600 degrees C. Temperature-dependent magnetization curves indicate the presence of an antiferrornagnetic coupling between the Mn magnetic moments. After annealing ferromagnetic films for 2 hours at 800 degrees C in N-2 atmosphere, they became paramagnetic at all temperatures. (c) 2005 Elsevier B.V. All rights reserved.