The original version of this Article incorrectly gave the first address in the list of affiliations as‘Fachbereich Physik,Technische Universitaet Kaiserslautern,Kaiserslautern,Germany’,instead of the correct‘Fachbe...The original version of this Article incorrectly gave the first address in the list of affiliations as‘Fachbereich Physik,Technische Universitaet Kaiserslautern,Kaiserslautern,Germany’,instead of the correct‘Fachbereich Physik and Landesforschungszentrum OPTIMAS,Technische Universität Kaiserslautern,D-67663 Kaiserslautern,Germany’.展开更多
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 ...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.展开更多
The field of magnonics,which aims at using spin waves as carriers in data-processing devices,has attracted increasing interest in recent years.We present and study micromagnetically a nonlinear nanoscale magnonic ring...The field of magnonics,which aims at using spin waves as carriers in data-processing devices,has attracted increasing interest in recent years.We present and study micromagnetically a nonlinear nanoscale magnonic ring resonator device for enabling implementations of magnonic logic gates and neuromorphic magnonic circuits.In the linear regime,this device efficiently suppresses spin-wave transmission using the phenomenon of critical resonant coupling,thus exhibiting the behavior of a notch filter.By increasing the spin-wave input power,the resonance frequency is shifted,leading to transmission curves,depending on the frequency,reminiscent of the activation functions of neurons,or showing the characteristics of a power limiter.An analytical theory is developed to describe the transmission curve of magnonic ring resonators in the linear and nonlinear regimes,and is validated by a comprehensive micromagnetic study.The proposed magnonic ring resonator provides a multi-functional nonlinear building block for unconventional magnonic circuits.展开更多
文摘The original version of this Article incorrectly gave the first address in the list of affiliations as‘Fachbereich Physik,Technische Universitaet Kaiserslautern,Kaiserslautern,Germany’,instead of the correct‘Fachbereich Physik and Landesforschungszentrum OPTIMAS,Technische Universität Kaiserslautern,D-67663 Kaiserslautern,Germany’.
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).
文摘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.
基金The project was funded by the European Research Council(ERC)Starting Grant 678309 MagnonCircuits and the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)-TRR 173-268565370(“Spin+X”,Project B01)the Nachwuchsring of the TU KaiserslauternR.V.acknowledges support of National Research Foundation of Ukraine(grant number 2020.02/0261).
文摘The field of magnonics,which aims at using spin waves as carriers in data-processing devices,has attracted increasing interest in recent years.We present and study micromagnetically a nonlinear nanoscale magnonic ring resonator device for enabling implementations of magnonic logic gates and neuromorphic magnonic circuits.In the linear regime,this device efficiently suppresses spin-wave transmission using the phenomenon of critical resonant coupling,thus exhibiting the behavior of a notch filter.By increasing the spin-wave input power,the resonance frequency is shifted,leading to transmission curves,depending on the frequency,reminiscent of the activation functions of neurons,or showing the characteristics of a power limiter.An analytical theory is developed to describe the transmission curve of magnonic ring resonators in the linear and nonlinear regimes,and is validated by a comprehensive micromagnetic study.The proposed magnonic ring resonator provides a multi-functional nonlinear building block for unconventional magnonic circuits.
