| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Soft Magnets and Magnetocaloric Materials: An FMD Symposium in Honor of Victorino Franco
|
| Presentation Title |
A Solution to the Permalloy Problem |
| Author(s) |
Ananya Balakrishna |
| On-Site Speaker (Planned) |
Ananya Balakrishna |
| Abstract Scope |
In 1914, a magnetic alloy (now known as the Fe-Ni permalloy) with unusually high magnetic permeability and low hysteresis was discovered at the Bell Telephone Laboratories. Several researchers have attributed this unusual behavior of the permalloy to the small anisotropy constant, however, there are several outliers (e.g., Fe-45Ni has small hysteresis despite large anisotropy constant, similar observation is noted for Sendust alloys), and this theory that dot not explain the complete story of magnetic hysteresis. In a departure from prior work, we hypothesize that a combination of a large local disturbance (needle microstructure) and material constants contributes to the drastic decrease in hysteresis in magnetic alloys. We recently developed a nonlinear framework based on the micromagnetics theory to test this hypothesis, and our findings provide insights into the longstanding permalloy problem and suggest a new mathematical relationship between material constants for which magnetic hysteresis is minimum. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Modeling and Simulation, |