Hua Chen
Author's posts
Apr 17
Realization of kagome spin ice in an intermetallic compound
Spin ices are exotic phases of matter characterized by frustrated spins obeying local “ice rules,” in analogy with the electric dipoles in water ice. Namely, on a tetrahedron with one spin or electric dipole moment sitting on each vertex, only the two-in-two-out configurations are allowed. Such a local constraint can lead to a macroscopic number …
Sep 21
Geometric Dynamics of Magnetization: Electronic Contribution
Magnetization dynamics has been routinely studied using the Landau-Lifshitz-Gilbert (LLG) equation. Although the LLG equation has a quantum mechanical origin and reflects the fact that magnetization and angular momentum of electrons are really the same thing, it has been used most of the time as a classical equation. The reason for it is that magnetism …
Sep 21
Electrical switching of the topological anomalous Hall effect in a non-collinear antiferromagnet above room temperature
First discovered by Edwin Hall in 1881, the anomalous Hall effect describes the transverse flow of electric currents under a longitudinal electric field in a ferromagnetic metal with its magnetization perpendicular to the measurement plane. By flipping the magnetization direction of the ferromagnet the transverse current also changes sign. The behavior looks similar to electrons …
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