About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Magnetic Domains in Magnetostrictive Fe-Ga Alloys |
Author(s) |
Yongmei M. Jin, Matthew N. Tianen |
On-Site Speaker (Planned) |
Yongmei M. Jin |
Abstract Scope |
Fe-Ga alloys (Galfenol) have attracted great attention as new giant magnetostrictive materials for over fifteen years, however little is known about the domain phenomena underlying their properties. Using Bitter method and domain theory, we investigate the magnetic domain structures in Fe-Ga single crystals. Our domain observation experiments reveal numerous previously unknown domain patterns and their responses to magnetic fields. As a cubic system of high magnetostriction and weak magnetocrystalline anisotropy, the domains on Fe-Ga surfaces are largely determined by the image forces (both magnetostatic and elastostatic) associated with the surfaces, making it challenging to infer inner bulk domains from surface observations, while the bulk domains dominate the material responses. Using domain theory, we analyze the energetics of domain structures near the surfaces to determine the bulk domain structures and their evolutions. The findings advance our understanding of the domain phenomena and mechanisms responsible for the magnetoelastic behaviors of Fe-Ga alloys. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |