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Updated: Jul 27, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Controlling the magnetic structure in W-type hexaferrites.

Mathias I Mørch1, Mogens Christensen1

  • 1Center for Materials Crystallography, Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus Universitet, Langelandsgade 140, Aarhus C, 8000, Denmark.

Journal of Applied Crystallography
|June 7, 2023
PubMed
Summary
This summary is machine-generated.

Tuning cobalt and zinc ratios in W-type hexaferrites alters magnetic ordering. Neutron diffraction revealed planar magnetic structures in some samples, indicating potential magnetic transitions adjustable by stoichiometry.

Keywords:
hexaferritesmagnetic orderingmultiferroicsneutron diffraction

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • W-type hexaferrites are known for their magnetic properties.
  • Uniaxial magnetic ordering is typical for most W-type hexaferrites.
  • The influence of Co/Zn stoichiometry on magnetic structure is not fully understood.

Purpose of the Study:

  • To synthesize W-type hexaferrites with varying Co/Zn ratios.
  • To investigate the magnetic ordering and transitions in these hexaferrites.
  • To determine the effect of Co/Zn stoichiometry on magnetic properties.

Main Methods:

  • Synthesis of W-type hexaferrites (SrCo2Fe16O27, SrCoZnFe16O27, SrZn2Fe16O27).
  • Neutron powder diffraction for magnetic structure analysis.
  • Thermomagnetic measurements for magnetic transition and Curie temperature determination.

Main Results:

  • SrCo2Fe16O27 and SrCoZnFe16O27 exhibited planar magnetic ordering (Cm'cm'), unlike the typical uniaxial ordering (P63/mm'c') in SrZn2Fe16O27.
  • Non-collinear magnetic terms were observed in all samples, with one common term suggesting a potential magnetic structure transition.
  • Magnetic transitions were observed at 520 K and 360 K for SrCo2Fe16O27 and SrCoZnFe16O27, respectively, with Curie temperatures of 780 K and 680 K.
  • SrZn2Fe16O27 showed a Curie temperature of 590 K without a distinct transition.

Conclusions:

  • The magnetic ordering in W-type hexaferrites can deviate from the typical uniaxial structure.
  • The presence of common non-collinear terms indicates a possible pathway for magnetic structure transitions.
  • Co/Zn stoichiometry is a critical factor in tuning the magnetic transition temperatures and overall magnetic behavior of W-type hexaferrites.