Giant Nuclear-Electronic Spin Pumping in the Heisenberg Antiferromagnet RbMnF_{3}

Area of Science:

• Condensed Matter Physics
• Spintronics
• Quantum Magnetism

Background:

• Nuclear spin waves arise from hyperfine coupling and exchange interactions.
• Interest in nuclear spin waves declined but is reviving due to spintronics applications.
• Recent studies show spin pumping in antiferromagnets like MnCO3.

Purpose of the Study:

• To observe and characterize giant nuclear-electronic spin pumping effects.
• To investigate these effects in the Heisenberg antiferromagnet RbMnF3.
• To explore the strong coupling between nuclear and electronic spins.

Main Methods:

• Utilized radio frequency excitation.
• Investigated the Heisenberg antiferromagnet RbMnF3 near its magnetic transition.
• Measured nuclear magnetic resonance frequencies and spin pumping signals.

Main Results:

• Observed giant nuclear-electronic spin pumping effects in RbMnF3.
• Demonstrated enhanced frequency pulling due to low electronic magnon frequencies near the spin-flop transition.
• Achieved signals nearly 2 orders of magnitude larger than in MnCO3, visible at higher temperatures.

Conclusions:

• Strong coupling between nuclear and electronic spins can be achieved in RbMnF3.
• Nuclear-electronic spin pumping is significantly enhanced in this material.
• The findings bridge nuclear spin excitations and spintronics, with potential for novel devices.