Sample preparation and annealing effects on the ferromagnetism in Mn-doped ZnO

被引：78
作者：
Zhang, J [1 ]
Skomski, R
Sellmyer, DJ
机构：
[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA
[2] Univ Nebraska, Ctr Mat Res & Anal, Lincoln, NE 68588 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2005年 / 97卷 / 10期
关键词：
D O I：
10.1063/1.1845858
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic properties of Mn-doped ZnO strongly depend on sample preparation and annealing. While the samples sintered in air at 500 degrees C show ferromagnetism at room temperature, those sintered at 900 degrees C are paramagnetic. The samples sintered in vacuum show a ferromagnetic transition at 45 K, which is attributed to ferrimagnetic Mn3O4. With an increase of annealing temperature, the ferromagnetism observed at room temperature in the low-temperature-sintered samples is gradually suppressed and finally completely removed. These results can be understood by considering a metastable ferromagnetic phase and its stability under varying temperatures and atmospheres. (c) 2005 American Institute of Physics.
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