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Related Concept Videos

Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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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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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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Magnetic Moment of an Electron01:23

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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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Nuclear Transmutation03:20

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

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A plutonium-based single-molecule magnet.

N Magnani1, E Colineau, J-C Griveau

  • 1European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe, Germany. nicola.magnani@ec.europa.eu roberto.caciuffo@ec.europa.eu.

Chemical Communications (Cambridge, England)
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals the first plutonium single-molecule magnet, a [tris-(tri-1-pyrazolylborato)-plutonium(III)] complex. Its magnetic properties exhibit temperature-dependent relaxation, transitioning from thermal activation to quantum tunneling.

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Area of Science:

  • * Inorganic Chemistry
  • * Materials Science
  • * Quantum Magnetism

Background:

  • * Single-molecule magnets (SMMs) are crucial for developing high-density data storage and quantum computing.
  • * Plutonium's unique electronic structure (5f⁵) presents an unexplored frontier for SMM research.
  • * Previous investigations into plutonium magnetism have been limited, hindering the development of novel magnetic materials.

Purpose of the Study:

  • * To synthesize and characterize the magnetic properties of a novel plutonium(III) complex.
  • * To determine if this plutonium complex exhibits single-molecule magnet behavior.
  • * To elucidate the magnetic relaxation mechanisms governing the complex's behavior at low temperatures.

Main Methods:

  • * Synthesis of the [tris-(tri-1-pyrazolylborato)-plutonium(III)] complex.
  • * Investigation of magnetic properties using alternating current (ac) susceptibility measurements.
  • * Analysis of magnetic relaxation dynamics across a range of temperatures.

Main Results:

  • * The [tris-(tri-1-pyrazolylborato)-plutonium(III)] complex demonstrates the characteristics of a single-molecule magnet.
  • * This marks the first reported instance of a plutonium-based single-molecule magnet.
  • * Magnetic relaxation follows a thermally activated process at higher temperatures, transitioning to quantum tunneling below 5 K.

Conclusions:

  • * The discovery of the first plutonium SMM opens new avenues in lanthanide and actinide magnetism research.
  • * Understanding the interplay between the 5f electrons and magnetic behavior is key to designing future molecular magnets.
  • * The observed relaxation dynamics provide insights into quantum phenomena in magnetic materials.