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Artificial-spin-ice and its application in a superconducting hybrid device

Title: Artificial-spin-ice and its application in a superconducting hybrid device

Speaker:  Prof. Wang Yong-Lei

School of Electronic Science and Engineering, Nanjing University

Time:  2019.04.25  2:00 PM

Location:  Room 437,  Xingjian Building

Host:School of Physics Science & Technology

Dr. Yong-lei Xiangrong Wang, Full Professor of Nanjing University. He got his B.A in Applied Physics from University of Science and Technology of China in 2005. He got his Ph.D in in Condensed Matter Physics from Institute of Physics Chinese Academy of Science in 2010. His research focuses on tailoring the properties of quantum materials with the objective of novel future electronic applications. Materials of interest include artificial spin/magnetic-charge ice, nano-superconductors, topological materials, nano-magnets, two-dimensional materials, magnetic semiconductors and hybrid heterostructures of these materials. He has published more than 30 SCI papers in Science、Nature Physics、Nature communications、Physical Review Letters、Science Advance. The total citation is higher than 800.

Abstract: In this talk, Prof Wang introduced the development of artificial spin ice. Artificial spin ice consists of an array of interacting nanoscale bar magnets following the ice rule of two spins in/out. It enables the study of geometrical frustration by design and through direct observation. Firstly, his team designed a rewritable artificial spin ice in which multiple configurations of long range ordered magnetic charges can be easily achieved and manipulated [1]. Secondly, his team propose and demonstrated a novel ferromagnetic/superconducting hybrid structure composed of this unique artificial spin ice pattern placed on top of a superconducting film [2]. The vortices in the underlying superconducting film strongly interact with the magnetic charges of the artificial spin ice structure. The superconductivity can be in-situ controlled by the magnetic charge order and symmetry, resulting in a switchable geometric frustration of superconducting vortices and a programmable vortex diode. This work demonstrates a new platform for designing and controlling the properties of superconducting films and other two-dimensional materials.  

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Reference:

  1. Yong-Lei Wang, Zhi-Li Xiao, Alexey Snezhko, Jing Xu, Leonidas E. Ocola, Ralu Divan, John E. Pearson, George W. Crabtree and Wai-Kwong Kwok, "Rewritable Artificial Magnetic Charge Ice", Science 352, 962 (2016)
  2. Yong-Lei Wang, XiaoyuMa, Jing Xu, Zhi-Li Xiao, Alexey Snezhko, Ralu Divan, Leonidas E. Ocola, John E. Pearson, Boldizsar Janko and Wai-Kwong Kwok, "Switchable geometric frustration in an artificial spin ice superconductor hetero-system", Nature Nanotechnology 13, 560 (2018)