Electron paramagnetic resonance study of Zn1–xCoxO: A predicted high-temperature ferromagnetic semiconductor.

Nathalie Jedrecy (1) , H.J. von Bardeleben (2) , Yunlin Jacques Zheng (1) , J.-L. Cantin (2)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 GPS - Groupe de Physique des Solides

The magnetic properties of Co2+ ions in epitaxial (Zn,Co)O layers with 10% Co concentration have been studied by electron paramagnetic resonance spectroscopy. The Co-related EPR spectrum is characterized by a 200-G broad anisotropic single line with g factors close to those of the isolated Co2+ ion. The temperature dependence of the EPR signal follows a Curie-Weiss law with a critical temperature of +12 K. We find no evidence for a high-temperature ferromagnetic state. Magnetocrystalline anisotropy is observed and a canted spin arrangement is suggested.

Mots clés: paramagnetic resonance; magnetic susceptibility; magnetic anisotropy; g-factor; zinc compounds; ferromagnetic materials; semimagnetic semiconductors; cobalt compounds; canted spin arrangements

Nathalie Jedrecy, H.J. von Bardeleben, Yunlin Jacques Zheng, J.-L. Cantin. Electron paramagnetic resonance study of Zn1–xCoxO: A predicted high-temperature ferromagnetic semiconductor.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 69, pp.041308. ⟨10.1103/PhysRevB.69.041308⟩. ⟨hal-00087055⟩