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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

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Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
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Spin doping of individual molecules by using single-atom manipulation.

Roberto Robles1, Nicolás Lorente, Hironari Isshiki

  • 1Centro de Investigación en Nanociencia y Nanotecnología, CIN2 (CSIC - ICN), Campus de la UAB, E-08193 Bellaterra, Spain. roberto.robles@cin2.es

Nano Letters
|May 31, 2012
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Summary

Atomic doping precisely controls molecular spin. Researchers used a scanning tunneling microscope to add or remove cesium atoms on yttrium bis(phthalocyanine) molecules, vanishing their spin-1/2 magnetic moment and enabling new spin-based nanotechnologies.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Area of Science:

  • Molecular spintronics
  • Quantum magnetism
  • Surface science

Background:

  • Controlling single-molecule spin is crucial for developing advanced spin-based nanotechnologies.
  • Previous methods for spin switching include gate-field effects and electron/photon excitations.
  • Yttrium bis(phthalocyanine) (YPc(2)) molecules on Au(111) surfaces retain their spin-1/2 magnetic moment due to weak substrate interaction.

Purpose of the Study:

  • To investigate atomic doping as a method for controlling molecular spin.
  • To demonstrate precise manipulation of molecular spin using a scanning tunneling microscope.
  • To explore the impact of atomic dopants on the magnetic properties of YPc(2) molecules.

Main Methods:

  • Utilizing a scanning tunneling microscope (STM) for atomic manipulation on single molecules.
  • Performing conductance measurements to detect changes in molecular spin.
  • Conducting density functional theory (DFT) calculations to corroborate experimental findings.

Main Results:

  • Atomic doping was shown to effectively alter the spin state of molecules.
  • Cesium (Cs) atoms were precisely placed onto YPc(2) molecules using STM.
  • The spin-1/2 magnetic moment of YPc(2) molecules vanished upon Cs atom deposition, confirmed by conductance measurements and DFT calculations.

Conclusions:

  • Atomic doping offers a controllable method for tuning molecular spin states.
  • STM-based atomic manipulation enables precise modification of magnetic properties at the single-molecule level.
  • This technique paves the way for novel single-molecule spintronic devices.