Tunable room-temperature ferromagnetism in Co-doped two-dimensional van der Waals ZnO. Chen, R., Luo, F., Liu, Y., Song, Y., Dong, Y., Wu, S., Cao, J., Yang, F., N’Diaye, A., Shafer, P., Liu, Y., Lou, S., Huang, J., Chen, X., Fang, Z., Wang, Q., Jin, D., Cheng, R., Yuan, H., Birgeneau, R. J., & Yao, J. Nature Communications, 12(1):3952, June, 2021. Bandiera_abtest: a Cc_license_type: cc_by Cg_type: Nature Research Journals Number: 1 Primary_atype: Research Publisher: Nature Publishing Group Subject_term: Magnetic properties and materials Subject_term_id: magnetic-properties-and-materials![Tunable room-temperature ferromagnetism in Co-doped two-dimensional van der Waals ZnO [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The recent discovery of ferromagnetism in two-dimensional van der Waals crystals has provoked a surge of interest in the exploration of fundamental spin interaction in reduced dimensions. However, existing material candidates have several limitations, notably lacking intrinsic room-temperature ferromagnetic order and air stability. Here, motivated by the anomalously high Curie temperature observed in bulk diluted magnetic oxides, we demonstrate room-temperature ferromagnetism in Co-doped graphene-like Zinc Oxide, a chemically stable layered material in air, down to single atom thickness. Through the magneto-optic Kerr effect, superconducting quantum interference device and X-ray magnetic circular dichroism measurements, we observe clear evidences of spontaneous magnetization in such exotic material systems at room temperature and above. Transmission electron microscopy and atomic force microscopy results explicitly exclude the existence of metallic Co or cobalt oxides clusters. X-ray characterizations reveal that the substitutional Co atoms form Co2+ states in the graphitic lattice of ZnO. By varying the Co doping level, we observe transitions between paramagnetic, ferromagnetic and less ordered phases due to the interplay between impurity-band-exchange and super-exchange interactions. Our discovery opens another path to 2D ferromagnetism at room temperature with the advantage of exceptional tunability and robustness.
@article{chen_tunable_2021,
title = {Tunable room-temperature ferromagnetism in {Co}-doped two-dimensional van der {Waals} {ZnO}},
volume = {12},
copyright = {2021 The Author(s)},
issn = {2041-1723},
url = {https://www.nature.com/articles/s41467-021-24247-w},
doi = {10.1038/s41467-021-24247-w},
abstract = {The recent discovery of ferromagnetism in two-dimensional van der Waals crystals has provoked a surge of interest in the exploration of fundamental spin interaction in reduced dimensions. However, existing material candidates have several limitations, notably lacking intrinsic room-temperature ferromagnetic order and air stability. Here, motivated by the anomalously high Curie temperature observed in bulk diluted magnetic oxides, we demonstrate room-temperature ferromagnetism in Co-doped graphene-like Zinc Oxide, a chemically stable layered material in air, down to single atom thickness. Through the magneto-optic Kerr effect, superconducting quantum interference device and X-ray magnetic circular dichroism measurements, we observe clear evidences of spontaneous magnetization in such exotic material systems at room temperature and above. Transmission electron microscopy and atomic force microscopy results explicitly exclude the existence of metallic Co or cobalt oxides clusters. X-ray characterizations reveal that the substitutional Co atoms form Co2+ states in the graphitic lattice of ZnO. By varying the Co doping level, we observe transitions between paramagnetic, ferromagnetic and less ordered phases due to the interplay between impurity-band-exchange and super-exchange interactions. Our discovery opens another path to 2D ferromagnetism at room temperature with the advantage of exceptional tunability and robustness.},
language = {en},
number = {1},
urldate = {2021-08-04},
journal = {Nature Communications},
author = {Chen, Rui and Luo, Fuchuan and Liu, Yuzi and Song, Yu and Dong, Yu and Wu, Shan and Cao, Jinhua and Yang, Fuyi and N’Diaye, Alpha and Shafer, Padraic and Liu, Yin and Lou, Shuai and Huang, Junwei and Chen, Xiang and Fang, Zixuan and Wang, Qingjun and Jin, Dafei and Cheng, Ran and Yuan, Hongtao and Birgeneau, Robert J. and Yao, Jie},
month = jun,
year = {2021},
note = {Bandiera\_abtest: a
Cc\_license\_type: cc\_by
Cg\_type: Nature Research Journals
Number: 1
Primary\_atype: Research
Publisher: Nature Publishing Group
Subject\_term: Magnetic properties and materials
Subject\_term\_id: magnetic-properties-and-materials},
keywords = {CoZnO, ferromagnetism},
pages = {3952},
}
Downloads: 0
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