Fabrication and characterisation of nanospintronic devices

Abstract

We report an improved fabrication scheme for carbon based nanospintronic devices and demonstrate the necessity for a careful data analysis to investigate the fundamental physical mechanisms leading to magnetoresistance. The processing with a low-density polymer and an optimised recipe allows us to improve the electrical, magnetic and structural quality of ferromagnetic Permalloy contacts on lateral carbon nanotube (CNT) quantum dot spin valve devices, with comparable results for thermal and sputter deposition of the material. We show that spintronic nanostructures require an extended data analysis, since the magnetisation can affect all characteristic parameters of the conductance features and lead to seemingly anomalous spin transport. In addition, we report measurements on CNT quantum dot spin valves that seem not to be compatible with the orthodox theories for spin transport in such structures.

13 pages, 5 figures

References in corpus (5)

• Near-unity Cooper pair splitting efficiency
• Nanospintronics with carbon nanotubes
• Permalloy-based carbon nanotube spin-valve
• Entanglement witnessing and quantum cryptography with non-ideal ferromagnetic detectors
• Local Spin Susceptibilities of Low-Dimensional Electron Systems

Cited by in corpus (16)

• Andreev bound states probed in three-terminal quantum dots
• A Double Quantum Dot Spin Valve
• Double quantum dot Cooper-pair splitter at finite couplings
• Transport across a carbon nanotube quantum dot contacted with ferromagnetic leads: experiment and non-perturbative modeling
• Superconducting contacts to a monolayer semiconductor
• Subgap resonant quasiparticle transport in normal-superconductor quantum dot devices
• Carbon nanotube quantum dots on hexagonal boron nitride
• Fork stamping of pristine carbon nanotubes onto ferromagnetic contacts for spin-valve devices
• Large voltage-tunable spin valve based on a double quantum dot
• Wideband and on-chip excitation for dynamical spin injection into graphene
• Entanglement-symmetry control in a quantum-dot Cooper-pair splitter
• Magnetoresistence engineering and singlet/triplet switching in InAs nanowire quantum dots with ferromagnetic sidegates
• Magnetoconductance signatures of chiral domain-wall bound states in magnetic topological insulators
• Full characterization of a carbon nanotube parallel double quantum dot
• Impact of tunnel barrier strength on magnetoresistance in carbon nanotubes
• Radio-frequency characterization of a supercurrent transistor made from a carbon nanotube