Bottom-up nano-integration route for modified carbon nanotube spintronic device fabrication

Abstract

This study is focused on a bottom-up nano-integration route for the production of carbon based spintronic devices. In order to enhance magnetic interactions along nanotube walls a controlled synthetic chemical technique is utilized, this method is based on a two-step method which firstly looks at the functionalization of nanotubes (carbonyl groups) and subsequently the attachment of an organo-metallic complex to the carbonyl group. The system is then characterized in bulk, including magnetometry analysis as well as transport at low temperatures. Mesoscopic electron-spin correlations have been observed as well as a clear crossover from superparamagnetism to weakly ferromagnetic depending on the functionalization technique. We then demonstrate a novel fabrication technique based on nano-integration utilizing a nano-tweezer created from a memory metal alloy. The devices envisioned include quantum rings, crossed junction as well as fine network structures that can be manipulated using nano-probes. As the carbon nanotubes have been functionalized with nanoscale magnetic molecules, such devices are interesting for novel spintronic applications.

Recent Advances in the Spintronic Application of Carbon-Based Nanomaterials

“…The results obtained present promising prospects for the fabrication and application of MWCNT-based spintronic devices. Mosse I.S.’s work with nano-tweezers is an important source for the creation of device components that could be useful for quantum information technology [ 57 ]. A controlled synthetic chemical technique was used to improve magnetic interactions along nanotube walls.…”

Electronic Properties and Band Gaps of Single-Wall Carbon Nanotubes Using <i>π</i> Orbitals Tight-Binding Model: A Comparative Study with <i>Ab Initio</i> Density Functional Theory

“…The electronic band structure for the zigzag tubes (10, 0), (12, 0), (14, 0), (15, 0), (16, 0) and (17, 0) (see Fig. 1) and for the armchair tubes (4,4), (6,6), (8,8), (10,10), (14,14) and (16,16) (see Fig. 2) were determined and investigated using TB calculations including π orbitals only in the high symmetry directions in the BZ between the Γ and K points.…”

“…The table.3 shows the gap values for armchair SWCNTs. It can be seen that the tubes (8,8), (10,10), (14,14), and (16,16) exhibit a metallic properties which confirms other calculation results [ 36,39]. However in the two small tubes (4,4) and (6,6) of diameter less than ∼ 0.8 nm (0.54 nm and 0.81 nm respectively), the gap values (0.67 eV and 0.43 eV respectively) don't agrre with those found in the DFT calculations based on ab-initio methods (see Table . 3).…”

“…Since the discovery of SWCNTs in 1993 [2], this novel nanostructured material has attracted enormous attention from the scientific community in several fields due to their extraordinary mechanical, electrical, thermal, vibrational and optical properties [3][4][5][6][7]. This unique combination of properties make this material a suitable candidate for a wide range of various potential applications in areas from integrated circuits [8], photovoltaics [9], nanophotonic applications [10], energy storage [11], interconnects [12,13], spintronic devices [14], sensors [15], batteries [16], transistors [17,18], light detectors [19] and light emitters [20]. This has sparked interest in experimentalists and theoreticians.…”