Title of Presentation

A Computational Approach to Analysing the Magnetization of Magnetic Nano-Structures: Armchair and Brickwork Artificial Spin Ice

Type of Submission

Event

Faculty Advisor

Narendra Jaggi

Graduation Year

2019

Location

Center for Natural Sciences, Illinois Wesleyan University

Start Date

13-4-2019 9:00 AM

End Date

13-4-2019 10:00 AM

Disciplines

Education

Abstract

Networks of magnetic nanowires provide a platform for studying the fundamental physics of “spin ice” systems. Magnetotransport and magnetization response of magnetic nanowires, set up as Armchair and Brickwork lattices, show unusual behavior. In the present study, we use computer simulations to try to predict the magnetization response of these two structures under different applied external magnetic fields and at different angles.

The mathematical equations that describe this physics constitute the Landau-Lifshitz-Gilbert (LLG) system of coupled nonlinear differential equations of large number of variables, and are essentially impossible to solve analytically. We have conducted computer simulations of the spatial distribution of the magnetization of these materials, by using an open source GPU accelerated software, called mumax3, which is a state-of-the-art tool for the international community of micromagnetics researchers. We integrate these density maps to produce hysteresis loops of magnetization for different applied magnetic fields and at different angles. We have observed abrupt transitions of magnetization and detailed micromagnetic structures that are in agreement with recently publishedexperimental results.

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Apr 13th, 9:00 AM Apr 13th, 10:00 AM

A Computational Approach to Analysing the Magnetization of Magnetic Nano-Structures: Armchair and Brickwork Artificial Spin Ice

Center for Natural Sciences, Illinois Wesleyan University

Networks of magnetic nanowires provide a platform for studying the fundamental physics of “spin ice” systems. Magnetotransport and magnetization response of magnetic nanowires, set up as Armchair and Brickwork lattices, show unusual behavior. In the present study, we use computer simulations to try to predict the magnetization response of these two structures under different applied external magnetic fields and at different angles.

The mathematical equations that describe this physics constitute the Landau-Lifshitz-Gilbert (LLG) system of coupled nonlinear differential equations of large number of variables, and are essentially impossible to solve analytically. We have conducted computer simulations of the spatial distribution of the magnetization of these materials, by using an open source GPU accelerated software, called mumax3, which is a state-of-the-art tool for the international community of micromagnetics researchers. We integrate these density maps to produce hysteresis loops of magnetization for different applied magnetic fields and at different angles. We have observed abrupt transitions of magnetization and detailed micromagnetic structures that are in agreement with recently publishedexperimental results.