Carbon nanotube: a low-loss spin-current waveguide

TL;DR

This paper shows that carbon nanotubes can serve as efficient, low-loss waveguides for spin currents, enabling long-distance, tunable magnetic information transfer with minimal dispersion, promising for memory device applications.

Contribution

It introduces a quantum-mechanical demonstration that carbon nanotubes effectively guide spin currents with low attenuation and tunability, highlighting their potential in magnetic memory technology.

Findings

Spin currents travel with nanotube Fermi velocity.

Magnetic excitations can be induced remotely.

Nanotubes exhibit very little dispersion and tunable attenuation.

Abstract

We demonstrate with a quantum-mechanical approach that carbon nanotubes are excellent spin-current waveguides and are able to carry information stored in a precessing magnetic moment for long distances with very little dispersion and with tunable degrees of attenuation. Pulsed magnetic excitations are predicted to travel with the nanotube Fermi velocity and are able to induce similar excitations in remote locations. Such an efficient way of transporting magnetic information suggests that nanotubes are promising candidates for memory devices with fast magnetization switchings.