On the room-temperature ferromagnetism in (ZnO)0.98(MnO2)0.02

被引：51

作者：

Bhatti, KP ^{[1
]}

Chaudhary, S ^{[1
]}

Pandya, DK ^{[1
]}

Kashyap, SC ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Phys, Thin Film Lab, New Delhi 110016, India

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 136卷 / 07期

关键词：

magnetic semiconductors; magnetic impurity interactions; room temperature ferromagnetism;

D O I：

10.1016/j.ssc.2005.09.002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Room-temperature ferromagnetism (RTFM) is investigated in the polycrystalline bulk (ZnO)(0.98)(MnO2)(0.02) samples prepared by a modified solid-state sintering route. Successive sintering of a sample was carried out in air at different temperatures in the range of 400-1000 degrees C. The study of magnetization and phase-investigation in the sample was carried out after each sintering step. The progressive suppression of impurities and the consequent reduction in RTFM is clearly observed in the samples with increase in the sintering temperature up to 800 C. The subsequent successive sintering of the (ZnO)(0.98)(MnO2)(0.02) sample up to 1000 degrees C yields fully paramagnetic sample exhibiting wurtzite structure. The studies support the conjecture (Kundaliya et al., Nat. Mater. 3 (2004) 709 [18]) that RTFM in this system has an origin related to a randomly distributed impurity phase produced by local dissolution of ZnO and MnO2. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：384 / 388

页数：5

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