Toward Tailored All-Spin Molecular Devices

Abstract

Molecular based spintronic devices offer great potential for future energy-efficient information technology as they combine ultimately small size, high-speed operation, and low-power consumption. Recent developments in combining atom-by-atom assembly with spin-sensitive imaging and characterization at the atomic level have led to a first prototype of an all-spin atomic-scale logic device, but the very low working temperature limits its application. Here, we show that a more stable spintronic device could be achieved using tailored Co-Salophene based molecular building blocks, combined with in situ electrospray deposition under ultrahigh vacuum conditions as well as control of the surface-confined molecular assembly at the nanometer scale. In particular, we describe the tools to build a molecular, strongly bonded device structure from paramagnetic molecular building blocks including spin-wires, gates, and tails. Such molecular device concepts offer the advantage of inherent parallel fabrication based on molecular self-assembly as well as an order of magnitude higher operation temperatures due to enhanced energy scales of covalent through-bond linkage of basic molecular units compared to substrate-mediated coupling schemes employing indirect exchange coupling between individual adsorbed magnetic atoms on surfaces.

Transport mirages in single-molecule devices

“…(18) ff.]. Exploiting this in combination with the STM's imaging capability has allowed chemical identification 23,26,27,97,[106][107][108][109][110][111][112][113] . This in turn has enabled atomistic modeling of the junction using ab-initio calculations [114][115][116][117] , also including strong interaction effects [118][119][120] , giving a detailed picture of transport on the atomic scale [121][122][123][124][125][126][127] .…”

Toward an automated analysis of exchange pathways in spin‐coupled systems

“…For atoms, the Ruderman–Kittel–Kasuya–Yoshida (RKKY) mechanism is typically dominant, in which the coupling between the local spins is mediated by the conduction electrons of the metal. However, for molecules with multiple spin centers or supramolecular arrangements of spin‐polarized molecules on surfaces, the situation is less clear, since RKKY interactions are expected to be in competition with the spin coupling mediated by bridging ligands in the molecule (Fig. , bottom).…”

Spin Logic Gates Operated by Protonation and Magnetism in Molecular Combinational Circuits

“…[14] It is well known that spin is another degree of freedom for electrons, which can transmit information as a binary signal for implementing the functions of spin logic gates. [16][17][18] In a recent work, [19] we proposed a set of spin logic gates in manganese phthalocyanine-based molecular combinational circuits, such as AND and OR gates. [16][17][18] In a recent work, [19] we proposed a set of spin logic gates in manganese phthalocyanine-based molecular combinational circuits, such as AND and OR gates.…”