Room-temperature ferromagnetism at an oxide/nitride interface
| Autor: | Jin, Qiao, Wang, Zhiwen, Zhang, Qinghua, Yu, Yonghong, Lin, Shan, Chen, Shengru, Qi, Mingqun, Bai, He, Li, Qian, Wang, Le, Yin, Xinmao, Tang, Chi Sin, Wee, Andrew T. S., Meng, Fanqi, Zhao, Jiali, Wang, Jia-Ou, Guo, Haizhong, Ge, Chen, Wang, Can, Yan, Wensheng, Zhu, Tao, Gu, Lin, Chambers, Scott A., Das, Sujit, Liu, Gang-Qin, Wang, Shanmin, Jin, Kui-juan, Yang, Hongxin, Guo, Er-Jia |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.128.017202 |
| Popis: | Heterointerfaces have led to the discovery of novel electronic and magnetic states because of their strongly entangled electronic degrees of freedom. Single-phase chromium compounds always exhibit antiferromagnetism following the prediction of Goodenough-Kanamori rules. So far, exchange coupling between chromium ions via hetero-anions has not been explored and the associated quantum states is unknown. Here we report the successful epitaxial synthesis and characterizations of chromium oxide (Cr2O3)-chromium nitride (CrN) superlattices. Room-temperature ferromagnetic spin ordering is achieved at the interfaces between these two antiferromagnets, and the magnitude of the effect decays with increasing layer thickness. First-principles calculations indicate that robust ferromagnetic spin interaction between Cr3+ ions via anion-hybridizations across the interface yields the lowest total energy. This work opens the door to fundamental understanding of the unexpected and exceptional properties of oxide-nitride interfaces and provides access to hidden phases at low-dimensional quantum heterostructures. Comment: 21 pages, 4 figures |
| Databáze: | arXiv |
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