Controlled deposition of magnetic systems for coherent quantum memory and computation Within the context of NANOMAGIQC project researchers focused on exploring the potential of bringing together nanotechnology devices and magnetic systems for quantum information and storage. The controlled deposition of magnetic quantum bits (qubits) in pure quantum spin-states was sought using two approaches. Digital Economy © PhotoDisc The first approach consists of a novel, reliable and easy methodology for deposition of individual Mn12 molecules onto a film surface. It involves the preparation of nanocomposite thin films, made from a polycarbonate polymeric matrix and an Mn12 complex, moulded with a master and exposed to vapours of an organic solvent. The basic concept behind this methodology relies on the control of an aggregation state where are Mn12 molecules are found after emerging to the film surface. Depending on the nature of the solvent used, this state can be easily manipulated and, hence the deposition of magnetic qubits. Aided by advanced microscopy, the compositional spatial modulation of the patterned aggregates of Mn12 molecules is decoded as far as magnetic response is concerned. Thereby, information involves molecular patterns working in the paramagnetic regime from mesoscopic down to nanometre length scales. This innovative methodology allows for the deposition and screening of small aggregates and molecules for the first time. This approach offers key advantages, such as use of a polymeric matrix for increased stability and enhancement of the film's overall mechanical strength. Additionally, it allows the exploitation of the commercially important and technologically interesting polycarbonates. Compared to others, these polymers feature a higher impact strength, creep resistance, optical clarity and lower moisture absorption. Most importantly, the end nanocomposite thin films were found to be well suited for modern magnetic and magneto-optical storage technologies, as polycarbonate resins are used in the disks fabrication. The second approach allows formation of patterned arrays of nanometre-sized aggregates, made of a few hundred single-molecule magnets derived from Mn12 complexes. Aided by stamping techniques, self-organising patterned arrays can be accomplished on large areas that are controlled by the motif of the stamp protrusions. Deposition and growth phenomena taking place beneath the protrusions due to capillary forces affect the smaller length scales, such as the size and distance of the molecular aggregates. This approach is suitable for a large variety of molecular materials and substrates because non-specific interactions are required. Therefore, there is a large potential for exploiting this sustainable patterning of single-molecule magnets for ultra-high-density magnetic storage and quantum computing.
