High temperature magnetic order in zinc sulfide doped with copper

Frank J. Owens , L. Gladczuk (1) , R. Szymczak (1) , P. Dluzewski (1) , A. Wisniewski (1) , H. Szymczak (1) , A. Golnik (2) , Ch. Bernhard (3) , Ch. Niedermayer (4)

1 PAN - Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences
2 UW - University of Warsaw
3 UNIFR - Université de Fribourg = University of Fribourg
4 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich]

We report the first observation of magnetic order above room temperature in zinc sulfide doped with Cu made by a simple sintering process and detected by ferromagnetic resonance (FMR), SQUID magnetometry and the μSR experiments. FMR study shows nonzero absorption above room temperature indicating a high value of Curie temperature. Field-cooled and zero-field cooled magnetization data indicate a bifurcation at about 300K. This temperature is considered to be the blocking temperature at ferromagnetic nano sized regions which appear to exist in the sample of ZnS doped with copper. The muon Spin Rotation measurements confirm highly nonuniform magnetc order. It was shown that about 25% of the sample volume fraction exhibits strong magnetism.

Mots clés: Dilute magnetic semiconductors; Muon Spin Rotation

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Frank J. Owens, L. Gladczuk, R. Szymczak, P. Dluzewski, A. Wisniewski, et al.. High temperature magnetic order in zinc sulfide doped with copper. Journal of Physics and Chemistry of Solids, 2011, 72 (6), pp.648. ⟨10.1016/j.jpcs.2011.02.009⟩. ⟨hal-00753049⟩