期刊
PHYSICAL REVIEW B
卷 97, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.104405
关键词
-
资金
- Natural Science Foundation of China [11364002, 11764004, 51302040, 11547259]
- Jiangxi Provincial Department of Education [GJJ14666]
In this paper, the magnetic properties of LiMn2O4 nanorods with an average diameter of similar to 100 nm and length of similar to 1 mu m are investigated. The temperature dependences of dc and ac susceptibility measurements show that LiMn2O4 nanorods experience multiple magnetic phase transitions upon cooling, i.e., paramagnetic (PM), antiferromagnetic (AFM), canted antiferromagnetic (CAFM), and cluster spin glass (SG). The coexistence between a long-range ordered AFM phase due to a Mn4+-Mn4+ interaction and a cluster SG phase originating from frozen AFM clusters at low temperature in LiMn2O4 nanorods is elucidated. Field-cooled hysteresis loops (FC loops) and magnetic training effect (TE) measurements confirm the presence of an exchange-bias (EB) effect in LiMn2O4 nanorods below the Neel temperature (T-N similar to 60 K). Furthermore, by analyzing the TE, we conclude that the observed EB effect originates completely from an exchange coupling interaction at the interface between the AFM and cluster SG states. A phenomenological model based on phase coexistence is proposed to interpret the origin of the EB effect below 60 K in the present compound. In turn, the appearance of the EB effect further supports the coexistence of AFM order along with a cluster SG state in LiMn2O4 nanorods.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据