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Ferromagnetism01:31

Ferromagnetism

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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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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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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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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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Color in Coordination Complexes
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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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Programming magnetization dynamics in a Dy-croconic acid system.

Yue Yang1, Xue-Ying Shao1, Jian-Xu Pan1

  • 1Department of Chemistry, Frontiers Science Center for New Organic Matter, State Key Laboratory of Advanced Chemical Power Sources, and Haihe Laboratory of Sustainable Chemical Transformations (Tianjin), College of Chemistry, Nankai University, Tianjin 300071, China. pcheng@nankai.edu.cn.

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|April 13, 2026
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Summary
This summary is machine-generated.

Researchers explored Dy(III) ion magnetization dynamics in Dy-croconic acid systems, transitioning from mononuclear to chain structures. This revealed how coordination changes impact magnetic relaxation mechanisms, offering insights for designing advanced rare-earth molecular magnets.

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Area of Science:

  • Materials Science
  • Magnetism
  • Chemistry

Background:

  • Understanding magnetization dynamics in rare-earth ions is crucial for developing molecular magnets.
  • Tuning coordination modes offers a pathway to control magnetic properties.

Purpose of the Study:

  • To investigate the impact of structural changes (mononuclear to 1D chain) on Dy(III) ion magnetization dynamics.
  • To elucidate the relaxation mechanisms and the role of single-ion anisotropy and inter-ion interactions.
  • To establish molecular design principles for high-performance rare-earth-based molecular magnets.

Main Methods:

  • Synthesized Dy-croconic acid systems with varying coordination modes.
  • Studied magnetization dynamics using magnetic measurements.
  • Employed magnetic dilution experiments and ab initio calculations to analyze relaxation mechanisms.

Main Results:

  • Structural transformation from mononuclear DyCA to 1D chain [Dy2CA2]n altered relaxation mechanisms.
  • Shift from Orbach-process-dominated relaxation to quantum tunneling of magnetization and Raman processes observed.
  • Single-ion anisotropy was identified as the dominant factor in magnetic relaxation.
  • Weak Dy⋯Dy interactions were found to suppress quantum tunneling of magnetization.

Conclusions:

  • Coordination environment significantly influences Dy(III) magnetization dynamics and relaxation pathways.
  • Quantum tunneling of magnetization and Raman processes are tunable via structural modifications.
  • The findings provide a molecular design strategy for advanced rare-earth molecular magnets.