Affiliation:
1. Instituto de Física Pontificia Universidad Católica de Chile Casilla 306 Santiago 7820436 Chile
2. Departamento de Física, FCFM Universidad de Chile Santiago 8370448 Chile
3. Departamentonde Ciencias Naturales y Tecnología Universidad de Aysén Eusebio Lillo 667 Coyhaique 5951616 Chile
4. Centro de Nanociencia y Nanotecnología CEDENNA Avda. Ecuador 3493 Santiago 9170124 Chile
Abstract
AbstractBloch points represent singularities within magnetic materials. From a macroscopic viewpoint, their cores are points where the magnetization vector is undefined, resulting in unique topological characteristics that influence the magnetic behavior of their hosts. The picture is very different at the microscopic level, where quantum effects enter the scene. The spin variables' quantum dynamics effect on the BP's stability is revealed. Zero‐point fluctuations, intrinsic fluctuations within the quantum mechanical ground state originating from the uncertainty principle, play a fundamental role. It is found that quantum fluctuations bloom in the vicinity of the singularity, thereby reducing the effective magnetic moment in its neighborhood. This increases the overall stability of the BP. These methods also allow for a characterization of the magnonic eigenmodes surrounding and bound to the singularity. The latter leads to predict on quite general grounds several features of the magnonic spectra, its degeneration structure, and its splitting response under a magnetic field. The last result is coherent with the association of a magnetic moment to the orbital angular momentum of the magnons. This approach allows integration with multiscale algorithms to provide a realistic description of generic topological singularities.
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