BYU

Abstract by Carson Richards

Personal Infomation


Presenter's Name

Carson Richards

Degree Level

Undergraduate

Abstract Infomation


Department

Physics and Astronomy

Faculty Advisor

Karine Chesnel

Title

Imaging Landau Closure Domains

Abstract

My research with Dr Chesnel has been focusing on investigating the formation of magnetic domains in nanomaterials, such as thin ferromagnetic films. For this presentation I will focusing on arrays of nickel (Ni) microstructures in collaboration with Los Alamos National Laboratory. The arrays of microstructures have been etched on 30 nm thick Ni layer deposited on silicon nitrides membranes. The shape of the microstructures range from larger squares, to smaller squares and elongated bars in an attempt to produce magnetic field vortices in the plane of the structures. These are difficult to see because the vorticies are in the plane of the structures and the MFM is only sensative to out of plane magnetic fields. We attempt to image these vortices using Magnetic Force Microscopy (MFM)  because the vortex domains close in a way to produce Landau closure domains showing a perpendicular component, which is a ghost image of the vortices can be detected by MFM. I will show exciting MFM images where such vortices and magnetic structures are visible and consistently observed on microsctructures of similar shapes.