物理科学与技术学院学术报告:Anomalous Antiferromagnetism in Metallic RuO2 Determined by Resonant X-ray Scattering

报告题目:Anomalous Antiferromagnetism in Metallic RuO2 Determined by Resonant X-ray Scattering 
报告人:朱志海博士, Massachusetts Institute of Technology (MIT) 
報告時間:6月11日下午1點-2點 
報告地點:天賜莊校區致遠樓301 
報告邀請人:淩新生 
报告摘要:Ruthenium oxide (RuO2) has been extensively used in electrocatalysis owing to its remarkable efficiency and stability. For decades, it has been considered as a Pauli paramagnet, until a recent neutron study on a bulk crystal of RuO2 revealed the presence of itinerant, above-room-temperature antiferromagnetism. We studied the magnetic ordering of thin films and bulk crystals of rutile RuO2 using resonant magnetic X-ray scattering (RXS) across the Ru-L2 absorption edge. Combining polarization analysis and azimuthal angle dependence of the magnetic Bragg signal, we have established the presence and texture of the collinear antiferromagnetic order in RuO2 with TNéel > 300??K.  In addition to revealing a robust antiferromagnetic ground state, the persistence of collinear spin order even in nanometer-thick films paves the way for potential applications of RuO2 in antiferromagnetic spintronic devices [1]. 
[1] Z.?H. Zhu, et al., Phys. Rev. Lett. 122, 017202 (2019). 
报告人简介:Dr. Zhu obtained his Ph. D. in 2016 from the University of Connecticut in the USA, under the advice of Prof. Barrett O. Wells. He currently is a postdoc associate at Massachusetts Institute of Technology (MIT) under the direction of Prof. Riccardo Comin.  Dr. Zhu’s research lies in correlated-electron physics in transition metal oxides (TMOs). His study is materials and problem based, tackling the full spectrum of a problem from material synthesis to advanced measurements, often at large scale facilities at national labs. 


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