Room-Temperature Manipulation of Magnetization Angle, Achieved with an All-Solid-State Redox Device.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Spintronics

Background:

• Developing efficient spintronics devices is crucial for advanced electronics.
• Achieving room-temperature (RT) control of magnetization is a key challenge.
• Existing carrier doping methods struggle with RT manipulation.

Purpose of the Study:

• To fabricate an all-solid-state redox device for RT magnetization angle manipulation.
• To investigate the feasibility of controlling magnetic properties at room temperature.
• To explore a novel approach for spintronics applications.

Main Methods:

• Fabrication of an all-solid-state redox device using magnetite (Fe3O4) thin film and Li+ conducting electrolyte thin film.
• Precise tracking of magnetization angle and magnetic stability using planar Hall measurements at RT.
• Analysis of the effects of Li+ insertion on Fe3O4 electronic structure and strain.

Main Results:

• Reversible manipulation of the magnetization angle by 10° was achieved while maintaining magnetic stability.
• A larger, irreversible manipulation of up to 56° was observed when magnetic stability was reduced.
• High-density Li+ insertion (approx. 10^21 cm^-3) tuned the 3d electron number and modulated internal strain in Fe3O4.

Conclusions:

• The developed device enables RT manipulation of magnetization angle, a key step for spintronics.
• The approach offers a simple structure and low electric power consumption, suitable for highly integrated devices.
• Tuning electron configuration and strain via Li+ insertion is an effective strategy for magnetic control.