Bloch points in nanostrips

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Topologically non-trivial particle-like objects, such as skyrmions, in complex magnetic materials are crucial for advanced data storage and processing.
• Helimagnetic materials with Dzyaloshinskii-Moriya interaction are a key class of materials exhibiting such phenomena.
• Previous research showed two-layered nanodisks with opposite chirality can host a single stable Bloch point.

Purpose of the Study:

• To investigate the possibility of hosting multiple coexisting Bloch points in FeGe nanostrips with opposite chirality layers.
• To determine the factors influencing the number and types of coexisting Bloch points.
• To predict specific nanostrip geometries suitable for hosting an arbitrary number of Bloch points.

Main Methods:

• Utilizing micromagnetic simulations to model the behavior of magnetic materials.
• Analyzing the influence of nanostrip geometry and Bloch point type on their coexistence.
• Developing predictive models for Bloch point configurations based on simulation results.

Main Results:

• FeGe nanostrips with opposite chirality layers can host multiple, coexisting Bloch points in various combinations.
• The number of simultaneously coexisting Bloch points is dependent on the nanostrip's geometry and the individual Bloch point types.
• Simulation results successfully predicted geometries capable of hosting a specified number of Bloch points, demonstrated by an 80-Bloch-point configuration.

Conclusions:

• FeGe nanostrips offer a versatile platform for hosting multiple Bloch points, exceeding the single-Bloch-point limit of nanodisks.
• The ability to control multiple Bloch points through geometric design opens new avenues for high-density data storage.
• This research provides a predictive framework for designing magnetic nanostructures with tailored topological defect configurations.