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Understanding the dynamic behavior of vortex matter in complicated pinning landscapes is a major challenge for both fundamental science and energy applications. In particular, the type, size, and density of pinning centers define the critical current, the largest current a superconductor can carry without losses. The prediction of optimal defect topologies for a given application is a highly nontrivial task. In this talk, I will present our work to address this challenge based on understanding the underlying complex vortex dynamics and calculation of critical currents in arbitrary pinning landscapes by largescale timedependent GinzburgLandau (TDGL) simulations [1, 2].
I will show validation studies using STEM tomography data for direct simulation of a real sample [3], introduce the CriticalCurrentbyDesign approach [4] and optimization strategies [5] by some examples.
Finally, I will present our most recent work on utilizing advanced genetic algorithms running on leadershipclass supercomputers to find and optimize arbitrary pinning landscapes, where we borrow concepts from biological evolution and replace natural selection by targeted selection to successively improve the fitness of the system, here the critical current [6] (see figure).
This CriticalCurrentbyDesign approach allows for the design of completely new defect configurations or improve existing commercial structures by postprocessing.
References:
 A. Sadovskyy, A. E. Koshelev, C. L. Phillips, D. A. Karpeev, A. Glatz, J. of Comp. Phys. 294, 639 (2015).
 http://osconscidac.org/
 A. Sadovskyy, A. E. Koshelev, A. Glatz, V. Ortalan, M. W. Rupich, M. Leroux, Phys. Rev. Applied 5, 014011 (2016).
 Ivan A. Sadovskyy, Ying Jia, Maxime Leroux, Jihwan Kwon, Hefei Hu, Lei Fang, Carlos Chaparro, Shaofei Zhu, Ulrich Welp, Jianmin Zuo, Venkat Selvamanickam, George W. Crabtree, Alexei E. Koshelev, Andreas Glatz, and WaiKwong Kwok, Adv. Mat. 28, 4593 (2016).
 Gregory Kimmel, Ivan A. Sadovskyy, Andreas Glatz, Phys. Rev. E 96, 013318 (2017).
 Ivan A. Sadovskyy, Alexei E. Koshelev, WaiKwong Kwok, Ulrich Welp, and Andreas Glatz, PNAS 116 (21), 10291 (2019).
Condensed Matter Seminar: "Towards Critical Current by Design."
Speaker 
(signup)
Andreas Glatz, Argonne National Laboratory 

Date:  10/11/2019 
Time:  1 p.m. 
Location:  190 ESB 
Sponsor:  Physics  Condensed Matter 
Event Type:  Seminar/Symposium 
Understanding the dynamic behavior of vortex matter in complicated pinning landscapes is a major challenge for both fundamental science and energy applications. In particular, the type, size, and density of pinning centers define the critical current, the largest current a superconductor can carry without losses. The prediction of optimal defect topologies for a given application is a highly nontrivial task. In this talk, I will present our work to address this challenge based on understanding the underlying complex vortex dynamics and calculation of critical currents in arbitrary pinning landscapes by largescale timedependent GinzburgLandau (TDGL) simulations [1, 2]. I will show validation studies using STEM tomography data for direct simulation of a real sample [3], introduce the CriticalCurrentbyDesign approach [4] and optimization strategies [5] by some examples. Finally, I will present our most recent work on utilizing advanced genetic algorithms running on leadershipclass supercomputers to find and optimize arbitrary pinning landscapes, where we borrow concepts from biological evolution and replace natural selection by targeted selection to successively improve the fitness of the system, here the critical current [6] (see figure). This CriticalCurrentbyDesign approach allows for the design of completely new defect configurations or improve existing commercial structures by postprocessing.
References:

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