Strong Ferromagnetism Achieved via Breathing Lattices in Atomically Thin Cobaltites
| Autor: | Er-Jia Guo, Huibin Lu, Zhi-Yi Hu, Jiaou Wang, Zhenping Wu, Shuang Chen, Chen Ge, Wenjun Cui, Sisi Li, Qiao Jin, Xin Tong, Qinghua Zhang, Jiesu Wang, Lin Gu, Xiahan Sang, Tao Zhu, Ryan F. Need, Jiali Zhao, Haizhong Guo, Manuel A. Roldan, Can Wang, Shan Lin, Meng He, Brian J. Kirby, Kuijuan Jin |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Spin states FOS: Physical sciences Applied Physics (physics.app-ph) 02 engineering and technology 010402 general chemistry 01 natural sciences Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Lattice constant Monolayer General Materials Science Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Magnetic moment Spintronics Condensed matter physics Mechanical Engineering Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics 021001 nanoscience & nanotechnology 0104 chemical sciences Ferromagnetism Mechanics of Materials Curie temperature Condensed Matter::Strongly Correlated Electrons Strongly correlated material 0210 nano-technology |
| Zdroj: | Advanced materials (Deerfield Beach, Fla.). 33(4) |
| ISSN: | 1521-4095 |
| Popis: | Low-dimensional quantum materials that remain strongly ferromagnetic down to mono layer thickness are highly desired for spintronic applications. Although oxide materials are important candidates for next generation of spintronic, ferromagnetism decays severely when the thickness is scaled to the nano meter regime, leading to deterioration of device performance. Here we report a methodology for maintaining strong ferromagnetism in insulating LaCoO3 (LCO) layers down to the thickness of a single unit cell. We find that the magnetic and electronic states of LCO are linked intimately to the structural parameters of adjacent "breathing lattice" SrCuO2 (SCO). As the dimensionality of SCO is reduced, the lattice constant elongates over 10% along the growth direction, leading to a significant distortion of the CoO6 octahedra, and promoting a higher spin state and long-range spin ordering. For atomically thin LCO layers, we observe surprisingly large magnetic moment (0.5 uB/Co) and Curie temperature (75 K), values larger than previously reported for any mono layer oxide. Our results demonstrate a strategy for creating ultra thin ferromagnetic oxides by exploiting atomic hetero interface engineering,confinement-driven structural transformation, and spin-lattice entanglement in strongly correlated materials. 24 pages, 5 figures, 1 supporting information with 13 figures |
| Databáze: | OpenAIRE |
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