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Spin Helicity in Chiral Lanthanide Chains.

Ionut Mihalcea1, Mauro Perfetti2, Francesco Pineider2,3

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|July 14, 2016
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Summary
This summary is machine-generated.

We determined the helical spin structure of lanthanide-based chiral chains using cantilever torque magnetometry. The Dy derivative exhibits slow magnetic relaxation, indicating a single-ion process for magnetization reversal.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • Chiral magnetic materials offer unique properties for advanced applications.
  • Lanthanide (Ln) ions provide tunable magnetic behaviors.
  • Helical spin structures are crucial for understanding magnetic anisotropy and relaxation.

Purpose of the Study:

  • To determine the helical spin structure of Ln-based chiral chains.
  • To investigate the magnetic anisotropy and relaxation dynamics.
  • To elucidate the mechanism of magnetization reversal.

Main Methods:

  • Cantilever torque magnetometry was employed to probe magnetic structures.
  • Alternating-current susceptibility measurements revealed magnetic relaxation.
  • Dilution studies with Y-based analogues clarified interaction contributions.
  • Hard X-ray synchrotron radiation was used to study optical activity.

Main Results:

  • The Dy and Er derivatives exhibit strong axial anisotropy, while the Tb derivative shows rhombicity.
  • Slow magnetic relaxation was observed only in the Dy derivative.
  • Intrachain ferromagnetic interactions were found to be insignificant for magnetization reversal.
  • The Dy derivative's magnetization reversal is primarily a single-ion process.
  • Optical activity was detected in Dy enantiomers with minimal 4f electron involvement.

Conclusions:

  • The helical spin structure and magnetic anisotropy of Ln-based chiral chains were elucidated.
  • The Dy derivative functions as a single-ion magnet, with relaxation dominated by local anisotropy.
  • Chirality influences magnetic properties and can lead to optical activity in these materials.