Efficient demagnetization protocol for the artificial triangular spin ice

三维偶极金字塔人工自旋冰中涌现序的磁场控制

Magnetic-Field Control of Emergent Order in a 3D Dipolar Pyramid Artificial Spin Ice

本研究制备了基于方金字塔结构的三维Pyramid人工自旋冰，通过模拟揭示其丰富相图与涌现方冰态，结合实验实现低能态调控，为三维人工自旋冰研究提供新平台。

Extending spin ice concepts to another geometry: the artificial triangular spin ice

In this work we propose and study a realization of an artificial spin ice-like system, not based on any real material, in a triangular geometry. At each vertex of the lattice, the "ice-like rule" dictates that three spins must point inward while the other three must point outward. We have studied the system's ground-state and the lowest energy excitations as well as the thermodynamic properties of the system. Our results show that, despite fundamental differences in the vertices topologies as compared to the artificial square spin ice, in the triangular array the lowest energy excitations also…

超快激光诱导的人工自旋冰磁弛豫驱动于偶极相互作用

Ultrafast Laser-Induced Magnetic Relaxation in Artificial Spin Ice Driven by Dipolar Interactions

通过飞秒激光诱导超快磁弛豫，实现人工自旋冰中低能态的快速访问，揭示偶极相互作用驱动的集体磁重构机制。

Magnetic anisotropy of elongated thin ferromagnetic nano-islands for artifical spin ice arrays

The energetics of thin elongated ferromagnetic nano-islands is considered for some different shapes, aspect ratios, and applied magnetic field directions. These nano-island particles are important for artificial spin-ice materials. For low temperature, the magnetic internal energy of an individual particle is evaluated numerically as a function of the direction of a particle's net magnetization. This leads to estimations of effective anisotropy constants for (1) the easy axis along the particle's long direction, and (2) the hard axis along the particle's thin direction. A spin relaxation algor…

Charge ordering of magnetic monopoles in triangular spin ice patterns

Artificial spin ice offers the possibility to investigate a variety of dipolar orderings, spin frustrations and ground states. However, the most fascinating aspect is the realization that magnetic charge order can be established without spin order. We have investigated magnetic dipoles arranged on a honeycomb lattice as a function of applied field, using magnetic force microscopy. For the easy direction with the field parallel to one of the three dipole sublattices we observe at coercivity a maximum of spin frustration and simultaneously a maximum of charge order of magnetic monopoles with alt…

正方形人工自旋冰中弛豫路径与域的出现

Relaxation pathways and emergence of domains in square artificial spin ice

本研究通过动能蒙特卡洛模拟揭示了正方形人工自旋冰中域结构形成的机制，发现考虑螺旋势垒分裂能支持复杂珊瑚状域的形成。