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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Magnetic Moment00:59

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Engineering atomic-scale magnetic fields by dysprosium single atom magnets.

A Singha1,2,3, P Willke4,5,6, T Bilgeri7

  • 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea. a.singha@fkf.mpg.de.

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Dysprosium atoms on magnesium oxide exhibit the highest magnetic anisotropy energy ever recorded for surface spins. These robust single-atom magnets enable precise control of magnetic fields at the atomic scale.

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Area of Science:

  • Quantum physics
  • Materials science
  • Surface science

Background:

  • Atomic-scale magnetic field engineering is crucial for advancing quantum devices and control.
  • Surface-supported single atom magnets offer potential for magnetic stability and spin manipulation.
  • Maximizing magnetic anisotropy energy (MAE) and minimizing quantum tunnelling are key for stable magnetic states.

Purpose of the Study:

  • To investigate the magnetic properties of dysprosium (Dy) atoms on magnesium oxide (MgO).
  • To demonstrate the potential of these atoms as robust single-atom magnets for nanoscale applications.
  • To engineer magnetic nanostructures with atomic-scale tunability.

Main Methods:

  • Utilized scanning tunnelling microscopy (STM) techniques.
  • Performed single-atom electron spin resonance (ESR) spectroscopy.
  • Investigated Dy atoms on MgO surfaces.

Main Results:

  • Discovered a giant MAE of 250 meV in Dy atoms on MgO, the highest reported for surface spins.
  • Confirmed no spontaneous spin-switching in Dy atoms over extended periods at ~1 K, even under low or vanishing magnetic fields.
  • Demonstrated the engineering of magnetic nanostructures with atomic-scale control over magnetic fields.

Conclusions:

  • Dy atoms on MgO represent a significant advancement in single-atom magnet technology.
  • Their exceptional MAE and stability make them ideal for precision quantum applications.
  • This work opens new avenues for atomic-scale magnetic field engineering and quantum device development.