Magnetic properties of β-MnO2 thin films grown by plasma-assisted molecular beam epitaxy

被引：30

作者：

Xing, X. J. ^{[1
]}

Yu, Y. P. ^{[1
]}

Xu, L. M. ^{[1
]}

Wu, S. X. ^{[1
]}

Li, S. W. ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 39期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1021/jp801694e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Single crystal beta-MnO2 films have been epitaxially grown on (001) LaAlO3 and (001) MgO substrates by using plasma-assisted molecular beam epitaxy. On the basis of reflective high energy electron diffraction, X-ray diffraction, Raman spectroscopy, and X-ray photoemission spectroscopy, the films are confirmed to be beta-MnO2 with slight oxygen vacancies resulting in coexistence of Mn3+ and Mn4+. These films are ferromagnetic at room temperature, which is reckoned to result from new forms of exchange interaction in MnO2 due to coexisting Mn3+ and Mn4+. The films on various substrates show different magnetic properties at 5 K attributable to different spin configurations between these films, which supports Yoshimori's theoretical prediction that an applied stress can vary the screw spin configuration. Two potential interaction mechanisms are proposed regarding the origins of the observed magnetic properties.

引用

页码：15526 / 15531

页数：6

共 40 条

[11] SPIN-FLOPPING IN MNF2 BY HIGH MAGNETIC FIELDS [J].