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)

报告时间：6月11日下午1点-2点

报告地点：天赐庄校区致远楼301

报告邀请人：凌新生

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 T_Néel > 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 .

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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