The Fe/Mo multilayers were prepared by electron beam evaporation, the micro structure and magnetic properties of the multilayers were studied by X-ray diffraction, vibrating-sample magnetometer (VSM) et al. The experi...The Fe/Mo multilayers were prepared by electron beam evaporation, the micro structure and magnetic properties of the multilayers were studied by X-ray diffraction, vibrating-sample magnetometer (VSM) et al. The experimental results revealed that the Fe/Mo multilayers in our experimental conditions behaved magnetoresistance effect with a sharp peak on magnetoresistance (MR) ratio curve, and magnetoresistance is easily saturated at low applied magnetic fields. For [Fe(1.5nm)/Mo(1.0nm)]4,2 multilayers, MR ratio could arrive to 0.1%. The antiferromagnetic interlayer coupling could be observed in some films at room temperature. The strength of the antiferromagnetic interlayer coupling J in the films is low because of the low saturation field Hs. The relationship between magnetic properties and micro structure was also discussed in this paper.展开更多
We theoretically explore higher-order topological magnons in collinear altermagnets,encompassing a dimensional hierarchy ranging from localized corner modes to propagating hinge excitations.By employing antiferromagne...We theoretically explore higher-order topological magnons in collinear altermagnets,encompassing a dimensional hierarchy ranging from localized corner modes to propagating hinge excitations.By employing antiferromagnetic interlayer coupling in bosonic Bogoliubov–de Gennes Hamiltonian,our work reveals anisotropic surface states and spatially distributed hinge modes propagating along facet intersections.We track the adiabatic evolution of Wannier centers to identify the bulk polarization with second-order topological magnon insulator,where various magnon spectra demonstrate symmetry-protected band structure beyond conventional topology.Leveraging the stability and propagative properties of hinge modes,these unconventional magnons demonstrate manipulability in atomic-scale modifications of termination.Our study integrates altermagnetism with higher-order topology,which advances magnon-based quantum computing processing energy-efficient integrated architectures and information transfer.展开更多
文摘The Fe/Mo multilayers were prepared by electron beam evaporation, the micro structure and magnetic properties of the multilayers were studied by X-ray diffraction, vibrating-sample magnetometer (VSM) et al. The experimental results revealed that the Fe/Mo multilayers in our experimental conditions behaved magnetoresistance effect with a sharp peak on magnetoresistance (MR) ratio curve, and magnetoresistance is easily saturated at low applied magnetic fields. For [Fe(1.5nm)/Mo(1.0nm)]4,2 multilayers, MR ratio could arrive to 0.1%. The antiferromagnetic interlayer coupling could be observed in some films at room temperature. The strength of the antiferromagnetic interlayer coupling J in the films is low because of the low saturation field Hs. The relationship between magnetic properties and micro structure was also discussed in this paper.
基金supported by the National Key Research and Development Program of China(Grant No.2022YFA1402802)the National Natural Science Foundation of China(Grant Nos.92165204 and 12494591)+2 种基金Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices(Grant No.2022B1212010008)Research Center for Magnetoelectric Physics of Guangdong Province(Grant No.2024B0303390001)Guangdong Provincial Quantum Science Strategic Initiative(Grant No.GDZX2401010)。
文摘We theoretically explore higher-order topological magnons in collinear altermagnets,encompassing a dimensional hierarchy ranging from localized corner modes to propagating hinge excitations.By employing antiferromagnetic interlayer coupling in bosonic Bogoliubov–de Gennes Hamiltonian,our work reveals anisotropic surface states and spatially distributed hinge modes propagating along facet intersections.We track the adiabatic evolution of Wannier centers to identify the bulk polarization with second-order topological magnon insulator,where various magnon spectra demonstrate symmetry-protected band structure beyond conventional topology.Leveraging the stability and propagative properties of hinge modes,these unconventional magnons demonstrate manipulability in atomic-scale modifications of termination.Our study integrates altermagnetism with higher-order topology,which advances magnon-based quantum computing processing energy-efficient integrated architectures and information transfer.
