Room-temperature ferromagnetic Mn-alloyed ZnO films obtained by pulsed laser desposition

in: Journal of Magnetism and Magnetic Materials (2006)
Diaconu, Mariana; Schmidt, Heidemarie; Hochmuth, Holger; Lorenz, Michael; Benndorf, Gabriele; Spemann, Daniel; Setzer, Annette; Esquinazi, Pablo; Pöppl, Andreas; von Wenckstern, Holger; Nielsen, Karl Wilhelm; Groß, Rudolf; Schmid, Herbert K.; Mader, Werner; Wagner, Gerald; Grundmann, Marius
Ferromagnetic, semi-insulating Mn-alloyed ZnO films with a Curie temperature above 375K have been grown by pulsed laser deposition on c-plane sapphire substrates. Antiferromagnetic coupling is revealed by temperature-dependent magnetization measurements. The antiferromagnetic coupling would be compatible with the observed weak ferromagnetism by assuming that the magnetic moments order antiferromagnetically but nonparallel (canted). We find a clear correlation between coercivity and mosaicity of the ferromagnetic Mn-alloyed ZnO films and explain it on the basis of a coercivity mechanism known from soft magnetic materials.

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