Tunable physical properties in BiAl_1- Mn O₃ thin films with novel layered supercell structures

Area of Science:

• Materials Science
• Solid State Physics
• Nanotechnology

Background:

• Morphological control in oxide nanocomposites is key for tailoring physical properties.
• Bismuth-based layered supercell (LSC) multiferroic structures offer potential for novel applications.

Purpose of the Study:

• To demonstrate the tunability of magnetic and optical properties in Bi-based LSC multiferroic structures.
• To investigate the impact of varying Al:Mn molar ratios on microstructure and properties.

Main Methods:

• Synthesis of Bi-based layered supercell (LSC) multiferroic structures with varying Al:Mn molar ratios.
• Microstructural characterization to observe evolution from supercell to Al-rich pillars.
• Measurement of magnetic, optical, and dielectric properties.

Main Results:

• Strong tunability of magnetic and optical properties observed with changes in Al:Mn ratio.
• Microstructure evolved from supercell to Al-rich pillars, correlating with property changes.
• Excellent multiferroic properties, in-plane magnetic anisotropy, tunable band gap, and anisotropic dielectric permittivity were achieved.

Conclusions:

• Microstructure evolution in Bi-based LSC materials is crucial for tuning multiferroic and optical properties.
• Identified three strain relaxation mechanisms during thin film growth.
• This work opens avenues for exploring other Bi-based LSC materials for tailored applications.