Structural and magnetic properties of transition metal substituted ZnO

Details Structural and magnetic properties of transition metal substituted ZnO Structural and magnetic properties of transition metal substituted ZnO

2003-12-09

arxiv.org/abs/cond-mat/0312233v1

Physics

Condensed Matter

Materials Science

RevTeX, 6 pages, 7 figures, To be published in J. Appl. Phys

Scientific paper

10.1063/1.1644638

Structural and magnetic properties have been studied for polycrystalline Zn_{1-x}TM_xO, where TM (transition metal ions) = Mn, Fe, and Co. No bulk ferromagnetism was observed for single-phase materials, contrary to the existing theories. Single-phase samples demonstrate paramagnetic Curie-Weiss behavior with antiferromagnetic interactions, similar to other diluted magnetic semiconductors. Non-optimal synthesis conditions lead to formation of second phases that are responsible for spin-glass behavior (ZnMnO_3 impurity for Zn_{1-x}Mn_xO (S. Kolesnik et al., J. Supercond.: Incorp. Novel Magn. 15, 251 (2002)) or high-temperature ferromagnetic ordering (Co metal for Zn_{1-x}Co_xO with the Curie temperature T_C > 800 K or (Zn,Fe)_3O_4 for Zn_{1-x}Fe_xO with T_C = 440 K).

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