Anisotropic Band‐Split Magnetism in Magnetostrictive CoFe <sub>2</sub> O <sub>4</sub>

Abstract Single crystal spinel CoFe 2 O 4 exhibits the largest room‐temperature saturation magnetostriction among non‐rare‐earth compounds and a high Curie temperature ( K), properties that are critical to a wide range of industrial and medical applications. Neutron spectroscopy reveals a large band splitting (∼60 meV) between two ferrimagnetic magnon branches, which is driven by site mixing between Co 2+ and Fe 3+ cations, and a significantly weaker magnetocrystalline anisotropy (∼3 meV). Central to this behavior is the competition between vast mismatched molecular fields on the tetrahedral A ‐site and octahedral B ‐site sublattices and the single‐ion anisotropy on the B ‐site. This creates a strong, energetic anisotropy that locks the magnetic moment within each structural domain in place. As a result of these differing energy scales, switching structural domains is energetically favored over a global spin reorientation under applied magnetic fields, and this is what amplifies the magnetostrictive nature of CoFe 2 O 4 .

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Publication Details

Journal
Advanced Functional Materials
Published
2025-11-12
DOI
https://doi.org/10.1002/adfm.202516830
Citations
1
Primary Topic
Magnetic Properties and Synthesis of Ferrites
Type
article
Field-Weighted Citation Impact
0.52
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article

Anisotropic Band‐Split Magnetism in Magnetostrictive CoFe 2 O 4

Guratinder Kaur, R. A. Ewings, T. J. Williams, P. M. Gehring et al.
1 citations
Advanced Functional Materials
Magnetic Properties and Synthesis of Ferrites
0.52
article

Anisotropic Band‐Split Magnetism in Magnetostrictive CoFe 2 O 4

Guratinder Kaur, R. A. Ewings, T. J. Williams, P. M. Gehring, D. Viehland, H. C. Walker, Yusuke Nambu, Christian Stock, David Voneshen, L. Keller, Harry Lane, M. Kawamata
article en
1 citations

Abstract

Abstract Single crystal spinel CoFe 2 O 4 exhibits the largest room‐temperature saturation magnetostriction among non‐rare‐earth compounds and a high Curie temperature ( K), properties that are critical to a wide range of industrial and medical applications. Neutron spectroscopy reveals a large band splitting (∼60 meV) between two ferrimagnetic magnon branches, which is driven by site mixing between Co 2+ and Fe 3+ cations, and a significantly weaker magnetocrystalline anisotropy (∼3 meV). Central to this behavior is the competition between vast mismatched molecular fields on the tetrahedral A ‐site and octahedral B ‐site sublattices and the single‐ion anisotropy on the B ‐site. This creates a strong, energetic anisotropy that locks the magnetic moment within each structural domain in place. As a result of these differing energy scales, switching structural domains is energetically favored over a global spin reorientation under applied magnetic fields, and this is what amplifies the magnetostrictive nature of CoFe 2 O 4 .

Advanced Functional MaterialsVol. 36(17)
Rutherford Appleton Laboratory (GB), National Institute of Standards and Technology (US), University of St Andrews (GB), Royal Holloway University of London (GB), Tohoku University (JP), Kyoto University (JP), Paul Scherrer Institute (CH), Diamond Light Source (GB), University of Manchester (GB), Maxwell Institute for Mathematical Sciences (GB), Tokyo Metropolitan University (JP), Virginia Tech (US)
Openalex Percentile: Top 31%
Magnetic Properties and Synthesis of Ferrites
0.52
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