We conducted an in-depth study of the resistance-switching mechanism in classical HfOx-based devices. Through atomic-level characterisation of the dynamic evolution of conductive filaments, we confirmed that the filament system in this type of device has a quasi-core-shell structure, consisting of a metallic Hf6O core and an insulating HfO2 crystalline shell. constitute. The study pinpointed multiple […]
In this Letter, we theoretically demonstrate the annihilation of single skyrmions in a multilayer structure. The process is mediated by topological hedgehog singularities known as Bloch points, whose intralayer and interlayer dynamics gives rise to intriguing emergent electromagnetic fields …
The topological properties of skyrmionic quasiparticles such as magnetic skyrmions and skyrmioniums enable their applications in future low-power, ultradense nanocomputing and neuromorphic systems. We propose here an all-magnetic skyrmionic interconnect, which has so far been the “missing component.” This interconnect will …
(Abstract) Synthetic ferromagnets (SFMs) possess the same layer structure found in the widely studied synthetic antiferromagnets. This consists of two ferromagnetic (FM) layers separated by a non-magnetic (NM) spacer forming the structure FM1/NM/FM2, but SFMs describe the case where the interlayer exchange coupling promotes the parallel alignment of the magnetizations of the FM layers. The […]
We developed a surface roughness model for magnetic systems, by taking into account the space-dependent uniaxial anisotropy and Dzyaloshinskii-Moriya interaction (DMI) …
The image is captured during the field-induced magnetic transition of a skyrmion lattice in theory. The colour code indicates the component of magnetisation perpendicular to the film surface. Increasing of the magnetic field forces skyrmion diameter to expand. Then the lattice inversion occurs involving the breaking of domain alls accompained with the emergence of transient […]
It reveals that the formation/annihilation of skyrmions will give rise to an emergent electric field with the frequency in the THz regime. The electric signal is due to the ultra-fast Bloch-point propagation, and both the amplitude and frequency can be tuned by the manipulation of Bloch-point dynamics. Our studies provide a concept of directly exploiting topological singularities which may be relevant for THz skyrmion-based electronic devices …
We propose a nanoscale synapse based on magnetic skyrmions. We show that when such synapses in a deep spiking neural network (SNN) with supervised learning achieve ∼98.61% classification accuracy in the MNIST …
I was really excited to attend the British-German WE-Heraeus-Seminar held in Physikzentrum Bad Honnef, Germany (1st – 5th Dec., 2019) …
In this work, our considerations go beyond static skyrmions, and we theoretically show that the formation/annihilation of both skyrmions and antiskyrmions is enabled by the transient creation and propagation of topological singularities (magnetic monopole-like Bloch points) …
