Fork stamping of pristine carbon nanotubes onto ferromagnetic contacts for spin-valve devices

TL;DR

This paper introduces 'fork stamping', a dry transfer method for pristine carbon nanotubes onto ferromagnetic contacts, enabling advanced spin-valve device fabrication with residue-free processes and in-situ annealing, suitable for complex structures.

Contribution

The paper presents a novel 'fork stamping' technique for pristine CNT transfer onto ferromagnetic contacts, improving device cleanliness and enabling complex spintronic structures.

Findings

Residue-free device fabrication demonstrated

Preliminary transport and magnetoresistance data obtained

Method compatible with complex device architectures

Abstract

We present a fabrication scheme called 'fork stamping' optimized for the dry transfer of individual pristine carbon nanotubes (CNTs) onto ferromagnetic contact electrodes fabricated by standard lithography. We demonstrate the detailed recipes for a residue-free device fabrication and in-situ current annealing on suspended CNT spin-valve devices with ferromagnetic Permalloy (Py) contacts and report preliminary transport characterization and magnetoresistance experiments at cryogenic temperatures. This scheme can directly be used to implement more complex device structures, including multiple gates or superconducting contacts.