TU Darmstadt / ULB / TUbiblio

Origin of the uniaxial magnetic anisotropy in cobalt ferrite induced by spark plasma sintering

Aubert, A. ; Garitaonandia, J. S. ; Maccari, F. ; Brötz, J. ; Skokov, K. ; Gutfleisch, Oliver (2023)
Origin of the uniaxial magnetic anisotropy in cobalt ferrite induced by spark plasma sintering.
In: Ceramics International, 49 (4)
doi: 10.1016/j.ceramint.2022.11.065
Article, Bibliographie

Abstract

Cobalt ferrite (CFO) is a promising candidate for magnetostrictive applications like actuators or sensors. We have recently shown that uniaxial magnetic anisotropy can be induced in CFO by reactive sintering using spark plasma sintering (SPS), which leads to an improvement of its magnetostrictive properties. However, the origin of the anisotropy and the formation mechanism remain unexplained so far. In this study, different SPS processes have been conducted to determine which parameter is responsible for the induced uniaxial anisotropy. We demonstrate that the magnetic anisotropy arises during the cooling step when done under SPS’s uniaxial compression. In addition, we also investigate the fundamental origin of the magnetic anisotropy induced during the SPS process. We show that the polycrystalline anisotropic cobalt ferrite obtained after SPS exhibits no texture. However, the SPS samples turn isotropic after being annealed in air at 400 °C/2 h, as shown by magnetic and magnetostrictive measurements. A change in ionic distribution after the annealing is also observed by Mössbauer spectroscopy. Our findings suggest that the induced magnetic anisotropy results from the ionic distribution of the Co2+ in the CFO’s spinel lattice, a mechanism previously observed in magnetic annealed CFO. This study advances the in-depth understanding of the relationship between SPS processing and magnetic properties of cobalt ferrite.

Item Type: Article
Erschienen: 2023
Creators: Aubert, A. ; Garitaonandia, J. S. ; Maccari, F. ; Brötz, J. ; Skokov, K. ; Gutfleisch, Oliver
Type of entry: Bibliographie
Title: Origin of the uniaxial magnetic anisotropy in cobalt ferrite induced by spark plasma sintering
Language: English
Date: 15 February 2023
Publisher: Elsevier
Journal or Publication Title: Ceramics International
Volume of the journal: 49
Issue Number: 4
DOI: 10.1016/j.ceramint.2022.11.065
Abstract:

Cobalt ferrite (CFO) is a promising candidate for magnetostrictive applications like actuators or sensors. We have recently shown that uniaxial magnetic anisotropy can be induced in CFO by reactive sintering using spark plasma sintering (SPS), which leads to an improvement of its magnetostrictive properties. However, the origin of the anisotropy and the formation mechanism remain unexplained so far. In this study, different SPS processes have been conducted to determine which parameter is responsible for the induced uniaxial anisotropy. We demonstrate that the magnetic anisotropy arises during the cooling step when done under SPS’s uniaxial compression. In addition, we also investigate the fundamental origin of the magnetic anisotropy induced during the SPS process. We show that the polycrystalline anisotropic cobalt ferrite obtained after SPS exhibits no texture. However, the SPS samples turn isotropic after being annealed in air at 400 °C/2 h, as shown by magnetic and magnetostrictive measurements. A change in ionic distribution after the annealing is also observed by Mössbauer spectroscopy. Our findings suggest that the induced magnetic anisotropy results from the ionic distribution of the Co2+ in the CFO’s spinel lattice, a mechanism previously observed in magnetic annealed CFO. This study advances the in-depth understanding of the relationship between SPS processing and magnetic properties of cobalt ferrite.

Uncontrolled Keywords: CoFe2O4, Spinel, Magnetic anisotropy, Spark plasma sintering, Mössbauer spectroscopy
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 15 Mar 2023 06:04
Last Modified: 15 Mar 2023 06:04
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details