Emergent ferromagnetism in ZnO/Al2O3 core-shell nanowires: Towards oxide spinterfaces

被引：75

作者：

Xing, G. Z. ^{[1
,2
]}

Wang, D. D. ^{[1
]}

Cheng, C-J. ^{[1
]}

He, M. ^{[1
]}

Li, S. ^{[2
]}

Wu, T. ^{[3
]}

机构：

[1] Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore

[2] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[3] King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

ROOM-TEMPERATURE FERROMAGNETISM; ZNO NANOPARTICLES; MAGNETIC SEMICONDUCTORS; SPINTRONICS; INTERFACE; DEVICES; ORIGIN; ARRAYS;

D O I：

10.1063/1.4813217

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report that room-temperature ferromagnetism emerges at the interface formed between ZnO nanowire core and Al2O3 shell although both constituents show mainly diamagnetism. The interface-based ferromagnetism can be further enhanced by annealing the ZnO/Al2O3 core-shell nanowires and activating the formation of ZnAl2O4 phase as a result of interfacial solid-state reaction. High-temperature measurements indicate that the magnetic order is thermally stable up to 750 K. Transmission electron microscopy studies reveal the annealing-induced jagged interfaces, and the extensive structural defects appear to be relevant to the emergent magnetism. Our study suggests that tailoring the spinterfaces in nanostructure-harnessed wide-band-gap oxides is an effective route towards engineered nanoscale architecture with enhanced magnetic properties. (C) 2013 AIP Publishing LLC.

引用

页数：5

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