Mechanism of resistive switching in HfOx-based memristors

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 […]

When Bloch point hops through magnetic multilayers

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 …

Our paper entitled ‘Magnetization dynamics in synthetic ferromagnetic thin films’ is published!

(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 […]

Surface roughness helps to stabilise out-of-plane spin textures in an uniformly in-plane magnetised system

We developed a surface roughness model for magnetic systems, by taking into account the space-dependent uniaxial anisotropy and Dzyaloshinskii-Moriya interaction (DMI) …

Congratulations on our new paper! ‘Tunable terahertz oscillation arising from Bloch-point dynamics in chiral magnets’

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 …

Our novel skyrmion-based synapses have launched 🚀

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 …

THz-oscillating electric signal from Bloch point dynamics

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) …

Magnetic switching of ideal/defective skyrmion lattices

We numerically show the reversal of skyrmion polarity via a field-induced first-order phase transition, accompained by a transient antiskyrmion state …

A universal Monte Carlo model for RRAM switching

A universal Monte Carlo simulator is developed based on a cell switching model and a tunneling-based transport model. Driven by external electric field, the growing process is …

An overview of RRAM

This review discusses recent advances to improve the switching performance via the conductive filament modulation, including material modulation, device structure design, and switching operation scheme optimization …