Spin-orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions

Area of Science:

• Condensed matter physics
• Spintronics

Background:

• Spin-transfer and spin-orbit torques are established methods for controlling electron spins.
• The role of nuclear spins in spin dynamics, particularly via torques, remains underexplored.

Purpose of the Study:

• To demonstrate the mediation of spin-orbit torques on nuclear spins through hyperfine coupling.
• To explore the potential for controlling nuclear magnetic moments.

Main Methods:

• Utilizing hyperfine coupling (Fermi contact and dipolar interactions) to link electronic and nuclear spins.
• Investigating the modification of electronic spin density by nuclear spins in a metal with electronic spin accumulation.

Main Results:

• Showcased that hyperfine interactions can mediate spin-orbit torques acting on nuclear spins.
• Identified field-like and damping-like torque components acting on the nucleus.
• Demonstrated the influence of nuclear spins on electronic spin density.

Conclusions:

• Established nuclear spin-orbit torque as a mechanism for controlling nuclear spins.
• Paved the way for stabilizing and directing nuclear magnetic momenta.
• Advanced the field of nuclear spintronics.