Magnetic-Torque Enhanced by Tunable Dipolar interactions

TL;DR

This paper demonstrates how tunable dipolar interactions between NV center spins in diamond can enhance magnetic torque, enabling new applications in detecting paramagnetic defects and studying angular momentum in spin relaxation.

Contribution

It introduces a method to amplify magnetic torque using NV center dipolar interactions, advancing spin-mechanical coupling techniques.

Findings

Enhanced spin torque observed via dipolar interactions.

Potential for detecting non-optically active paramagnetic defects.

Implications for cooling mechanical oscillators.

Abstract

We use tunable dipolar-interactions between the spins of nitrogen-vacancy (NV) centers in diamond to rotate a diamond crystal. Specifically, we employ cross-relaxation between the electronic spin of pairs of NV centers in a trapped diamond to enhance the anisotropic NV paramagnetism and thus to increase the associated spin torque. Our observations open a path towards the use of mechanical oscillators to detect paramagnetic defects that lack optical transitions, to investigation of angular momentum conservation in spin relaxation processes and to novel means of cooling the motion of mechanical oscillators.