Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 29, Pages 10393-10398Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja504088n
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Funding
- National Natural Science Foundation of China [11135008, 11105151, U1332111, U1332131, U1232132]
- National Basic Research Program of China [2012CB825800]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [11321503]
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The synthesis of atomically thin transitionmetal oxide nanosheets as a conceptually new class of materials is significant for the development of next-generation electronic and magnetic nanodevices but remains a fundamental chemical and physical challenge. Here, based on a template-assisted oriented growth strategy, we successfully synthesized half-unit-cell nanosheets of a typical transition-metal oxide alpha-Fe2O3 that show robust intrinsic ferromagnetism of 0.6 mu(B)/atom at 100 K and remain ferromagnetic at room temperature. A unique surface structure distortion, as revealed by X-ray absorption spectroscopy, produces nonidentical Fe ion environments and induces distance fluctuation of Fe ion chains. First-principles calculations reveal that the efficient breaking of the quantum degeneracy of Fe 3d energy states activates ferromagnetic exchange interaction in these Fe5-co-O-Fe6-co ion chains. These results provide a solid design principle for tailoring the spin-exchange interactions and offer promise for future semiconductor spintronics.
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