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兰州大学110周年校庆学术活动之物理学院学术报告——侯志鹏博士

2019-05-20  磁学实验室

应磁学与磁性材料教育部重点实验室、兰州大学电镜中心和物理科学与技术学院邀请,华南师范大学“青年拔尖”引进人才侯志鹏副研究员将于2019524-25日来我校进行学术交流并做学术报告,欢迎参加!

报告题目:高温度稳定性磁斯格明子新材料发现及电学方法调控

报告时间:2019524日(星期五)下午15:00

报告地点:兰州大学逸夫生物楼电镜中心会议室

 

报告摘要:Nanoscle magnetic skyrmions are topologically protected vortex-like spin textures that have been considered as promising candidates for the transport of information in further spintronic applications based on the racetrack memory concept due to their nanoscale dimension, stable particle-like feature, and an ultralow threshold for current-driven motion. Recently, most of the skyrmions are observed in a small class of chiral magnetic materials, where the Dzyaloshinskii-Moriya interaction (DMI) is active. However, their overall low thermal stability has been one of the major factors hindering the practical applications. In this paper, we report the observation of a new-type magnetic skyrmions with extremerely high temperature stability in the centrosymmetric frustrated magnet Fe3Sn2[1,2]. By using FIB technique, we have fabricated a geometrically confined nanostripe with a width of 600 nm and thickness of 250 nm. The in-situ LTEM observations have demonstrated that a single chain of skyrmion with uniform spin textures can be created at room temperature. The investigations on the temperature stability of the single skyrmion chain have found that it shows an extremerely high temperature stability that the size and distance of the skyrmions in the chain can keep unchanged at temperatures varying from 300 K up to a record-high temperature of 630 K[3]. Furthermore, we report the experimental realization of the current-driven helicity switching of Bloch-type skyrmions at room temperature in such a nanostripe[4]. The critical pulse current density required to trigger the helicity switching is 109 - 1010 A/m2 with a corresponding pulse-width range of 1 μs - 100 ns.

References

[1] Z. P. Hou, W. H. Wang, X. X. Zhang, et al., Adv. Mater. 2017, 29 (29), 1701144.

[2]Z. P. Hou, Q. Zhang, W. H. Wang, X. X. Zhang, et al., ACS Nano, 2019, 13(1), 922.

[3]Z. P. Hou, Q. Zhang, W. H. Wang, X. X. Zhang,et al., Nano Lett. 2018, 18 (2), 1274.

[4] Z. P. Hou, Q. Zhang, X. C. Zhang, Y. Zhou, W. H. Wang, X. X. Zhang, et al., Phys. Rev. Lett. 2019 (in revise).

 

报告人简介:侯志鹏,博士,九三学社社员,副研究员,华南师范大学“青年拔尖”引进人才。2015年博士毕业于吉林大学物理学院(吉林大学/中科院物理所联合培养博士),之后于中科院物理所、沙特阿卜杜拉国王科技大学做博士后研究。20189月加入华南师范大学。侯志鹏博士主要从事金属磁性功能材料-新型室温磁斯格明子材料及器件、拓扑量子材料输运方面的研究工作。已发表SCI论文40篇,其中以第一/通信作者身份在包括Advanced MaterialsNanolettersACS NanoACS Applied Materials & Interfaces, Physical Review B, Applied Physics Letters等期刊上发表论文20篇,发表论文总引用次数三百余次。担任Advanced MaterialsNanolettersACS Applied Materials & Interfaces, Applied Physics Letters等国际权威SCI期刊审稿人。

 

兰州大学磁学与磁性材料教育部重点实验室

兰州大学电镜中心

兰州大学物理科学与技术学院

2019520