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Magnetic resonance imaging of a single atom

03.08.2019

A group of scientists from the Center for Quantum Nanoscience (QNS), along with their US colleagues, have performed magnetic resonance imaging (MRI) imaging at the smallest level to date. The objects of this shooting were individual atoms, and as a result, scientists got a visual visualization of the distribution of the magnetic field of these atoms.

Magnetic resonance imaging is usually performed in hospitals and other health care facilities as part of the process of diagnosing diseases. MRI technology allows you to get a picture of the distribution density of spins (rotations) of electrons and protons of atoms of the human body, and the more such rotations are recorded by sensitive equipment sensors, the more high-quality and informative the survey is.

However, the scientists mentioned above proved that MRI technology can also be used with respect to single atoms located on the surface. To do this, a tunneling scanning microscope is used, which, using a tip "sharpened" to atomic thickness, allows one to scan and obtain an image of individual atoms.

In these experiments, the atoms of two chemical elements, iron and titanium, both of which are magnetic materials, were examined. Through the process of manipulating nano-sized objects, the atoms of these elements were placed on the surface and, therefore, they were clearly visible using a tunneling microscope. The researchers then scanned these atoms with the tip of a microscope, which produced a picture of the distribution of the magnetic field of each atom and a picture of the magnetic interaction between the atoms, which either attracted or repelled like tiny magnets depending on the direction of rotation of their electrons.

In the near future, the researchers plan to use "atomic" MRI technology to study and map the distribution of magnetic fields of more complex structures, such as organic molecules and crystals of magnetic materials. This, in turn, will provide scientists with new data on the structure of matter, which can be used later in the development of new materials, for example. In addition, this technology can be used to measure and control the state of quantum systems that perform certain computational functions much faster than conventional computers.

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