Localized NMR Mediated by Electrical-Field-Induced Domain Wall Oscillation in Quantum-Hall-Ferromagnet Nanowire

TL;DR

This paper demonstrates localized nuclear magnetic resonance in a quantum Hall ferromagnet nanowire by electrically inducing domain wall oscillations, revealing the persistence of domain walls and enabling electrical control of magnetic resonance.

Contribution

It introduces a method to achieve localized NMR via electric-field-driven domain wall oscillation in a quantum Hall system, showing domain wall survival and electrical control.

Findings

Electrical domain wall oscillation induces NMR spectra.

Domain walls survive near confined geometries.

Electrical means can localize magnetic resonance.

Abstract

We present fractional quantum Hall domain walls confined in a gate-defined wire structure. Our experiments utilize spatial oscillation of domain walls driven by radio frequency electric fields to cause nuclear magnetic resonance. The resulting spectra are discussed in terms of both large quadrupole fields created around the wire and hyperfine fields associated with the oscillating domain walls. This provides the experimental fact that the domain walls survive near the confined geometry despite of potential deformation, by which a localized magnetic resonance is allowed in electrical means.