Perpendicular switching of a single ferromagnetic layer induced by in-plane current injection

Area of Science:

• Spintronics
• Materials Science
• Nanotechnology

Background:

• Magnetic data storage relies on writing, storing, and retrieving magnetic bits.
• Giant magnetoresistance improved read-out, but magnetic writing remains challenging, especially for high-coercivity materials.
• Perpendicular magnetic anisotropy is key for stable, miniaturized data storage but hinders writing processes.

Purpose of the Study:

• To demonstrate efficient magnetic switching of a perpendicularly magnetized ferromagnet using in-plane current.
• To investigate the underlying physical mechanisms, including Rashba interaction and spin Hall effect.
• To develop a reprogrammable magnetic switch for spintronic applications.

Main Methods:

• Fabrication of a device using a thin cobalt layer with perpendicular magnetic anisotropy, interfaced with platinum and AlOx.
• Utilizing in-plane current injection at room temperature to induce magnetic switching.
• Analyzing switching field symmetry and efficiency dependence on material properties.

Main Results:

• Successful demonstration of switching a perpendicularly magnetized cobalt dot via in-plane current injection.
• Identified Rashba interaction and spin Hall effect as key contributors to the switching mechanism.
• Observed increased switching efficiency with higher magnetic anisotropy and aluminum layer oxidation.

Conclusions:

• In-plane current injection offers a viable method for writing to high-coercivity magnetic materials.
• The developed device is a simple, scalable, reprogrammable magnetic switch suitable for non-volatile memory and logic.
• This work advances spintronic device integration with current magnetic recording technology.