Experimental Determination of Magnetic Anisotropy in Exchange-Bias Dysprosium Metallocene Single-Molecule Magnets |
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| Authors: | Dr. Yin-Shan Meng Dr. Jin Xiong Mu-Wen Yang Dr. Yu-Sen Qiao Dr. Zhi-Qiang Zhong Prof. Hao-Ling Sun Prof. Jun-Bo Han Prof. Tao Liu Prof. Bing-Wu Wang Prof. Song Gao |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Rd., Dalian, 116024 P. R. China;2. Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing Key Laboratory for Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 P. R. China;3. Wuhan National High Magnetic Center, Huazhong University of Science and Technology, Wuhan, 430074 P. R. China;4. Department of Chemistry and Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University, Beijing, 100875 P. R. China |
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| Abstract: | ![]()
We investigate a family of dinuclear dysprosium metallocene single-molecule magnets (SMMs) bridged by methyl and halogen groups [Cp′2Dy(μ-X)]2 (Cp′=cyclopentadienyltrimethylsilane anion; 1 : X=CH3−; 2 : X=Cl−; 3 : X=Br−; 4 : X=I−). For the first time, the magnetic easy axes of dysprosium metallocene SMMs are experimentally determined, confirming that the orientation of them are perpendicular to the equatorial plane which is made up of dysprosium and bridging atoms. The orientation of the magnetic easy axis for 1 deviates from the normal direction (by 10.3°) due to the stronger equatorial interactions between DyIII and methyl groups. Moreover, its magnetic axes show a temperature-dependent shifting, which is caused by the competition between exchange interactions and Zeeman interactions. Studies of fluorescence and specific heat as well as ab initio calculations reveal the significant influences of the bridging ligands on their low-lying exchange-based energy levels and, consequently, low-temperature magnetic properties. |
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| Keywords: | angular-resolved magnetometry dysprosium metallocene Magnetic anisotropy single-molecule magnets |
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