Tension-free Dirac strings and steered magnetic charges in 3D artificial spin ice  

作　　者：Sabri Koraltan Florian Slanovc Florian Bruckner Cristiano Nisoli Andrii V.Chumak Oleksandr V.Dobrovolskiy Claas Abert Dieter Suess 

机构地区：[1]Physics of Functional Materials,Faculty of Physics,University of Vienna,Vienna,Austria [2]Theoretical Division,Los Alamos National Laboratory,Los Alamos,NM,USA [3]Nanomagnetics and Magnonics,Faculty of Physics,University of Vienna,Vienna,Austria [4]Research Platform MMM Mathematics-Magnetism-Materials,University of Vienna,Vienna,Austria

出　　处：《npj Computational Materials》2021年第1期1127-1134,共8页计算材料学（英文）

基　　金：We would like to thank Kevin Hofhuis and Johann Fischbacher for the fruitful discussions.The computational results presented have been achieved,in part,using the Vienna Scientific Cluster(VSC).S.K.,C.A.A.V.C.and D.S.gratefully acknowledge the Austrian Science Fund(FWF)for support through grant No.I 4917(MagFunc);O.V.D.acknowledges the Austrian Science Fund(FWF)for support through grant No.I 4889(CurviMag).

摘　　要：3D nano-architectures presents a new paradigm in modern condensed matter physics with numerous applications in photonics,biomedicine,and spintronics.They are promising for the realization of 3D magnetic nano-networks for ultra-fast and low-energy data storage.Frustration in these systems can lead to magnetic charges or magnetic monopoles,which can function as mobile,binary information carriers.However,Dirac strings in 2D artificial spin ices bind magnetic charges,while 3D dipolar counterparts require cryogenic temperatures for their stability.Here,we present a micromagnetic study of a highly frustrated 3D artificial spin ice harboring tension-free Dirac strings with unbound magnetic charges at room temperature.We use micromagnetic simulations to demonstrate that the mobility threshold for magnetic charges is by 2 eV lower than their unbinding energy.By applying global magnetic fields,we steer magnetic charges in a given direction omitting unintended switchings.The introduced system paves the way toward 3D magnetic networks for data transport and storage.

关 键 词：STABILITY MAGNETIC artificial 

分 类 号：TB383[一般工业技术—材料科学与工程]