Presenter Information

Ali Al KadhimFollow

Advisor Information

Renat Sabirianov

Location

Dr. C.C. and Mabel L. Criss Library

Presentation Type

Poster

Start Date

3-3-2017 2:15 PM

End Date

3-3-2017 3:30 PM

Abstract

Rare earth element based alloys have been the source of high performance magnetic alloys, and have played a paramount role in the development of various technologies, including: memory devices (such as credit cards, random-access memory), sensors, and various biomedical applications. However, there is a tremendous need to replace rare earth metals with material with powerful magnetic properties. Our group recently found CrTe-based materials that show very promising magnetic properties in nanostructured form. The magnetic modeling of such material in nanostructured form prior to their fabrication demonstrates their magnetic properties in bulk form. In this project, we investigate the behavior of bulk material made out of nanomagnets to predict the magnetic properties using Object Oriented Micromagnetic Framework, which will help screening candidate materials prior to their fabrication. We model a single spherical bulk nanomagnet and a touching bi-layer system with intergranular exchange. We then obtain coercivity as a function of anisotropy constant, and coercivity as a function of intergranular exchange. We show in the case of a single sphere, that coercivity increases when increasing anisotropy, and that small coercivity corresponds to small anisotropy and vortex switching. We further show that in bulk assembled material coercivity increases when increasing anisotropy as well as increasing intergranular exchange energy in the bi-layer system made of granular media.

COinS
 
Mar 3rd, 2:15 PM Mar 3rd, 3:30 PM

Designing Novel Nanostructured Permanent Magnets

Dr. C.C. and Mabel L. Criss Library

Rare earth element based alloys have been the source of high performance magnetic alloys, and have played a paramount role in the development of various technologies, including: memory devices (such as credit cards, random-access memory), sensors, and various biomedical applications. However, there is a tremendous need to replace rare earth metals with material with powerful magnetic properties. Our group recently found CrTe-based materials that show very promising magnetic properties in nanostructured form. The magnetic modeling of such material in nanostructured form prior to their fabrication demonstrates their magnetic properties in bulk form. In this project, we investigate the behavior of bulk material made out of nanomagnets to predict the magnetic properties using Object Oriented Micromagnetic Framework, which will help screening candidate materials prior to their fabrication. We model a single spherical bulk nanomagnet and a touching bi-layer system with intergranular exchange. We then obtain coercivity as a function of anisotropy constant, and coercivity as a function of intergranular exchange. We show in the case of a single sphere, that coercivity increases when increasing anisotropy, and that small coercivity corresponds to small anisotropy and vortex switching. We further show that in bulk assembled material coercivity increases when increasing anisotropy as well as increasing intergranular exchange energy in the bi-layer system made of granular media.