超级交换
磁化
磁性
凝聚态物理
铁磁性
范德瓦尔斯力
光致发光
杂质
材料科学
磁场
化学
物理
光电子学
有机化学
量子力学
分子
作者
Kimo Pressler,Thom J. Snoeren,Kelly M. Walsh,Daniel R. Gamelin
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-02-01
卷期号:23 (4): 1320-1326
被引量:3
标识
DOI:10.1021/acs.nanolett.2c04533
摘要
The two-dimensional (2D) van der Waals ferromagnet CrI3 has been doped with the magnetic optical impurity Yb3+ to yield materials that display sharp multiline Yb3+ photoluminescence (PL) controlled by the magnetism of CrI3. Magneto-PL shows that Yb3+ magnetization is pinned to the magnetization of CrI3. An effective internal field of ∼10 T at Yb3+ is estimated, attributed to strong in-plane Yb3+-Cr3+ superexchange coupling. The anomalously low energy of Yb3+ PL in CrI3 reflects relatively high Yb3+-I- covalency, contributing to Yb3+-Cr3+ superexchange coupling. The Yb3+ PL energy and line width both reveal the effects of spontaneous zero-field CrI3 magnetic ordering within 2D layers below TC, despite the absence of net magnetization in multilayer samples. These results illustrate the use of optical impurities as "designer defects" to introduce unique functionality to 2D magnets.
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