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ESR-STM on single molecules and molecule-based constructions


STM picture of iron phthalocyanine (FeLaptop) molecules, iron (Fe) atoms, and titanium (Ti) atoms co-deposited on 2 monolayers of magnesium oxide (MgO) floor atop a silver substrate. Well-isolated FeLaptop molecules and naturally fashioned FeLaptop dimers are plentiful. Credit: Institute for Basic Science

Scaling down info units to the atomic scale has introduced the curiosity of utilizing particular person spins as a fundamental unit for knowledge storage. This requires exact detection and management of spin states and a greater understanding of spin-spin interactions.


For the primary time ever, scientists on the IBS Center for Quantum Nanoscience at Ewha Womans University (QNS) have imaged the spin of a person molecule utilizing electron spin resonance in a scanning tunneling microscope. This achievement, revealed this month in Nature Chemistry, harnessed the facility of artificial chemistry to regulate the electron spin of a molecule.

A scanning tunneling microscope (STM) has the flexibility to see precise atomic constructions, atom by atom, at a stage that isn’t potential with different strategies. This examine makes use of an electrical microwave utilized to the STM tip to drive electron spin resonance (ESR) on single molecules and examine the magnetic interaction between two molecules utilizing this system.

“Employing single molecules in atomic-scale quantum-control studies is always of high interest and importance. This work sheds light on some intriguing magnetic interactions between non-localized spins, which is crucial for developing molecule-based spintronic devices,” says the paper’s first writer, Dr. Xue Zhang.

Fe, Ti atoms, and FeLaptop molecules had been co-deposited on the floor of a skinny magnesium oxide movie grown on a silver substrate. They had been then imaged and probed utilizing an STM outfitted with ESR capabilities. This work has prolonged the ESR experimental platform from single atoms to a wider class of matter—magnetic molecules, which brings many extra potentialities to carry out quantum management on single magnetic molecules.

Electron spin resonance is extensively employed in biology and chemistry to find out the construction of unknown molecules and to measure the dynamic properties of spins in these molecules. ESR is a cousin of magnetic resonance imaging (MRI) that most individuals are conversant in from hospital visits. ESR can be a vital device within the rising analysis subject of quantum-coherent nanoscience, the place the quantum properties of spins are utilized for quantum computation and quantum info science.

“It is impressive to see that the intermolecular interaction can be investigated with an energy resolution in the nano-electron volt precision. Certainly, we should explore more unknowns with this fantastic ESR-STM technique,” says Yu Wang of QNS.


Exotic magnetic states in miniature dimensions


More info:
Andreas Heinrich, Electron spin resonance of single iron phthalocyanine molecules and function of their non-localized spins in magnetic interactions, Nature Chemistry (2021). DOI: 10.1038/s41557-021-00827-7. www.nature.com/articles/s41557-021-00827-7

Citation:
ESR-STM on single molecules and molecule-based constructions (2021, November 11)
retrieved 11 November 2021
from https://phys.org/news/2021-11-esr-stm-molecules-molecule-based.html

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