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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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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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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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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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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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Persistent dynamic magnetic state in artificial honeycomb spin ice.

J Guo1, P Ghosh1, D Hill1

  • 1Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA.

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Artificial honeycomb spin ice exhibits a perpetual dynamic state due to self-propelled magnetic charge defect relaxation. This dynamic state, mediated by quasi-particle entities, persists even at low temperatures without external tuning.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Topological magnetic charges in spin ice materials give rise to mobile magnetic monopoles.
  • Artificial honeycomb spin ice dynamics are typically governed by domain wall kinetics, requiring external fields or currents.

Purpose of the Study:

  • To investigate the dynamic state of artificial honeycomb spin ice beyond conventional domain wall kinetics.
  • To explore the possibility of self-propelled magnetic charge defect relaxation in artificial spin ice systems.

Main Methods:

  • Utilized neutron spin echo spectroscopy for quantitative investigation of magnetic charge defect dynamics.
  • Employed dynamic Monte Carlo simulations to model and confirm the observed kinetic behavior.

Main Results:

  • Demonstrated a perpetual dynamic state in artificial permalloy honeycomb lattice due to self-propelled magnetic charge defect relaxation, independent of external tuning.
  • Observed sub-nanosecond relaxation times for magnetic charge defects, comparable to bulk spin ice monopoles.
  • Confirmed that the kinetic process remains active at low temperatures, suggesting thermal fluctuation is not the primary driver.

Conclusions:

  • Artificial honeycomb spin ice exhibits dynamic phenomena mediated by quasi-particle entities, akin to magnetic monopoles and magnons.
  • The findings challenge the conventional understanding of artificial spin ice dynamics, revealing intrinsic self-propulsion mechanisms.