摘要
寻找一种性能良好的磁性绝缘材料是发展新型多功能量子自旋电子器件至关重要的基础, 但是大多数已知的磁性绝缘材料具有居里温度低(< 300 K), 铁磁性和结构对称性差的特点. 本工作中, 我们成功设计并制备了一种新型的磁性绝缘体: Bi8Fe2.8Co0.2-Ti2O20Cl, 它具有包含五层钙钛矿层的层状Sillen-Aurivillius结构. 令人惊讶的是, 此种化合物的居里温度达到了约804 K, 比未掺杂的奈耳温度提高超过300 K. 此外, 由于Sillen层的存在, Bi8Fe2.8-Co0.2Ti2O20Cl具有比所有已知相同Co摩尔比掺杂的Aurivillius氧化物更大的剩余磁化强度. X射线吸收光谱(XAS)和X-光磁性圆二色性(XMCD)光谱分析表明, Bi8Fe2.8Co0.2Ti2O20Cl的铁磁性主要是由Co掺杂引起的FeO6八面体的形变和Fe−O−Co的Dzyaloshinskii-Moriya(D-M)相互作用所致.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2016YFA0401004), the Chinese Universities Scientific Fund (CUSF, WK2310000055), and the External Cooperation Program of BIC (Chinese Academy of Sciences, 211134KYSB20130017). X-ray Magnetic Circular Dichroism (XMCD) measurements were performed at the beamline 08U-a in the Shanghai Synchrotron Radiation Facility (SSRF) in Shanghai, China.
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Author contributions Peng R, Wang J gave the direction of the experiments; Tang H and Huang H conducted the experiments together; Chen Z, Fu Z and Huang J participated in the discussion; Lu Y gave suggestions to the experiments and revised the manuscript with Tang H and Peng R.
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Conflict of interest The authors declare that they have no conflict of interest.
Haowen Tang is a Master student from the University of Science and Technology of China (USTC). He graduated from the Department of Materials Science and Engineering of the USTC with a Bachelor’s degree in 2017. His research interest is focused on new layered multiferroic materials.
Ranran Peng is an associate professor at the USTC. She graduated from the Department of Materials Science and Engineering of the USTC in 2003 with a PhD degree. She did Post-doctoral research at Tsinghua University from 2003 to 2005. From 2011 to 2012, she was a visiting scholar at Pennsylvania State University. She has been teaching at the USTC since 2005. Her main research is focused on solid oxide fuel cells and new layered multiferroic materials.
Yalin Lu is a full professor of the USTC. He is now Director of National Synchrotron Radiation Laboratory, Deputy Director of Hefei Science Center. Before joining the USTC, he was a visiting professor at Lawrence Berkeley National Laboratory (1996–1998), a research professor in electrical engineering at Tufts University (1998–2000) and a full professor in physics at the US Air Force Academy (2003–2012). His research group in the USTC works on materials for energy conversion, THz optics and materials, optoelectronics, and complex oxides materials physics.
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Tang, H., Chen, Z., Wang, J. et al. A new high-temperature perovskite-like magnetic insulator. Sci. China Mater. 63, 1330–1336 (2020). https://doi.org/10.1007/s40843-020-1309-2
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DOI: https://doi.org/10.1007/s40843-020-1309-2