ABSTRACT
Novel electric and magnetic properties can be achieved in materials engineered at nanometer dimensions. The emergence of new functionalities is attributed to the atomic, charge, spin, or orbital structure of the heterointerface. By comprehending the intricacies of interface structures, it becomes possible to manipulate electric and magnetic degrees of freedom, ideally at room temperature. This control facilitates the realization of synthetic magnetoelectric coupling in nanocomposites or the regulation of spin textures in quantum heterostructures. In this presentation, I aim to introduce the intriguing phenomenon of oxide interfaces as an appetizer, followed by a detailed exploration of our recent research on emergent phenomena at transition metal nitride interfaces. This includes: The observation of an electronic state transition in highly crystalline antiferromagnetic CrN films under strain and reduced dimensionality [1,2]. The identification of a substantial exchange bias at the interfaces between a ferromagnetic Fe3N and an antiferromagnetic CrN [3]. The induction of a large magnetic moment at high-quality nitride ferromagnetic/superconducting interfaces [4]. We anticipate that these findings on nitride heterointerfaces will kindle significant interest in the rapidly evolving field, fostering a deeper understanding of magnetic proximity behaviors at quantum heterointerfaces for future spintronic devices.
References:
(1) Q. Jin et al., Adv. Mater. 33, 2005920 (2021); (2) Q. Jin et al., Phys. Rev. Lett. 128, 017202 (2022); (3) Q. Jin et al., Adv. Mater. 35, 2208221 (2023); and (4) Q. Jin et al., Nat. Sci. Rev. under revision (2023).
BIOGRAPHY
Prof. Er-Jia Guo holds the position of full professor at the Institute of Physics (IOP), Chinese Academy of Sciences (CAS), and serves as an adjunct professor at the University of CAS. He is the recipient of several awards, including the National Young Thousand Talent Program and the Hundred Talent Program of CAS. Prof. Guo earned his Ph.D. in Optics from IOP-CAS in 2012. His academic journey includes postdoctoral fellowships at the Max Planck Institute for Microstructure Physics and Mainz University (2012-2015) and Oak Ridge National Laboratory (2015-2018). He was appointed Associated Professor of IOP-CAS in September 2018 and has been promoted to full professor since September 2023. Prof. Guo's research focuses on quantum phenomena at correlated heterogeneity interfaces, including oxides, nitrides, and other low-dimensional materials. His significant contributions to the field are evident in over 140 published journal articles.
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