| 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 |
4f-electrons Driven Giant Magnetic and Optical Anisotropy in Site-substituted M-type Strontium-hexaferrite |
| Author(s) |
Durga Paudyal |
| On-Site Speaker (Planned) |
Durga Paudyal |
| Abstract Scope |
We discover a giant magnetocrystalline anisotropy (MCA) constant in abundant element substituted M-type hexaferrite, assisted by a quantum-confined electron transfer. Remarkably, the electron transfer leads to the formation of 3+ valence state in substituted site and Fe2+ at the 2a site producing an occupied 4f1 state that adds a significant contribution to MCA and magnetic moment. A 50% substitution of Sr forms a metallic state, while a full substitution retains the semiconducting state. In the latter, the band gap is reduced due to the formation of charge transferred states in the gap region. The optical absorption coefficient shows an enhanced anisotropy between light polarization in parallel and perpendicular directions. Calculated formation energies, including the analysis of probable competing phases, and elastic constants confirm that both compositions are chemically and mechanically stable.
This work is supported by CMI, an Energy Innovation Hub funded by the USDOE, Office of EERE, AMO. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Electronic Materials, Modeling and Simulation |