Molecule based planar spintronic logic devices
Abstract
Title: Molecule based planar spintronic logic devicesObjective:The objective of this project is to design, synthesize, characterize, and operate molecule basedplanar spintronic logic devices with atomic-level precision and single-spin sensitivity. In this project, PI proposes to study all-spin molecular spintronic devices using planar salophene-based molecules with single- and multi-metal centers.Approach:Recent progress in applying spin-polarized scanning tunneling microscopy (SP-STM) and spectroscopy(SP-STS) to magnetic molecules on surfaces combined with advanced techniques for depositing molecules of various sizes onto clean substrates under very well defined ultra-high (UHV) vacuum conditions raise great hopes for achieving the ultimate goal of nano-scale all-spin molecular devices in the near future.In this project, PI proposes to use of planar salophene-based molecules with single- and multi-metalcenters as building blocks for planar all-spin molecular devices. He will use an existing UHVcompatibleelectro-spray deposition (ESD) apparatus combined with a home-developed soft-landing protocol in order to deposit those molecules of various sizes non-destructively onto atomically clean substrates. He will then make use of the Ullmann coupling in order to crosslink those molecular building blocks on the substrate, thereby forming covalently-bonded molecular chains, molecular junctions, and finally full molecular device structures. The individual molecular building blocks as well as the final molecular devices will be characterized by atomic-resolution spin-sensitive microscopy and spectroscopy. PI intends to make use of magnetically intercalated graphene as appropriatesubstrates for magnetic molecules allowing the spin-dependent molecule-substrate coupling to betuned, e.g. via the magnetic transition metal used for the intercalation. The role of the chosen substrate as well as the intramolecular coupling mechanisms between the molecular spin centers will be investigated in detail down to the atomic level.SOW:Research tasks to be carried out under this project are:1. SP-STM of Co, Ni and Cu substituted (5,5 )-Br2-salophene molecules on Co/Feintercalatedgrapheme2. On surface metalation (Fe, Mn, Cr, Gd) of single (5,5 )-Br2-H2-salophene molecules3. On surface metalation (Ni, Fe, Mn, Cr, Gd) of Br3-triple-salophene molecules4. SP-STM of single metalized molecules on Co/Fe-intercalated grapheme5. SP-STM of metalized Br3-triple-salophene molecules on Co/Fe-intercalated grapheme6. Search for optimized substrates for molecular reactions and operation of molecular devices7. Growth of molecular chains on optimized substrate8. STS studies of molecular Kondo resonances9. SP-STM measurements of metal substituted (5,5 )-Br-salophene molecules on optimized substrates10. SP-STM measurements of metal substituted Br3-triple-salophene molecules on optimized substrates11. SP-STM studies of molecule based device structure on optimized substrate12. SP-STM studies of spin-dependent interactions within the molecular chain13. SP-STM studies of interactions within a triple-salophene molecule14. Operation of the molecular device15. Quality control of the molecular device by SP-STMMerits and ONR relevance:This is a unique project that is highly complementary to ONR s initiative on bottom-up synthesis of carbon-based molecular scale electronics. PI is a pioneer and world s top expert in spin-polarized scanning tunneling microscopy (SP-STM) technique and his participation in the program will be enormously beneficial to ONR s initiative.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N000141612900
Entities
People
- Roland Wiesendanger
Organizations
- Office of Naval Research
- United States Navy
- University of Hamburg