Phase Diagram of 360 degrees Domain Walls in Magnetic Rings
Document Type
Article
Publication Date
7-2019
Publication Title
IEEE Transactions on Magnetics
Abstract
One method to increase bit density in magnetic memory devices is to use multi-state structures, such as a ferromagnetic nanoring with multiple domain walls (DWs), to encode information. However, there is a competition between decreasing the ring size in order to more densely pack bits and increasing it to make multiple DWs stable. This paper examines the effects of ring geometry, specifically inner and outer diameters (ODs), on the formation of 360 degrees DWs. By sequentially increasing the strength of an applied circular magnetic field, we examine how DWs form under the applied field and whether they remain when the field is returned to zero. We examine the relationships between field strength, number of walls initially formed, and the stability of these walls at zero field for different ring geometries. We demonstrate that there is a lower limit of 200 nm to the ring diameter for the formation of any 360 degrees DWs under an applied field, and that a high number of 360 degrees DWs are stable at remanence only for narrow rings with large ODs.
Repository Citation
Bickel, Jessica E. and Aidala, Katherine E., "Phase Diagram of 360 degrees Domain Walls in Magnetic Rings" (2019). Physics Faculty Publications. 384.
https://engagedscholarship.csuohio.edu/sciphysics_facpub/384
Article Number
2301006
DOI
10.1109/TMAG.2019.2900292
Volume
55
Issue
7
