Controlling the magnetic structure in W-type hexaferrites

Mathias I Mørch, Mogens Christensen*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

W-type hexaferrites with varied Co/Zn ratios were synthesized and the magnetic order was investigated using neutron powder diffraction. In SrCo 2Fe 16O 27 and SrCoZnFe 16O 27 a planar ( Cm' cm') magnetic ordering was found, rather than the uniaxial ordering ( P6 3/ mm' c') found in SrZn 2Fe 16O 27 which is common in most W-type hexaferrites. In all three studied samples, non-collinear terms were present in the magnetic ordering. One of the non-collinear terms is common to the planar ordering in SrCoZnFe 16O 27 and uniaxial ordering in SrZn 2Fe 16O 27, which could be a sign of an imminent transition in the magnetic structure. The thermomagnetic measurements revealed magnetic transitions at 520 and 360 K for SrCo 2Fe 16O 27 and SrCoZnFe 16O 27, and Curie temperatures of 780 and 680 K, respectively, while SrZn 2Fe 16O 27 showed no transition but a Curie temperature at 590 K. This leads to the conclusion that the magnetic transition can be adjusted by fine-tuning the Co/Zn stoichiometry in the sample.

Original languageEnglish
JournalJournal of Applied Crystallography
Volume56
IssuePt 3
Pages (from-to)597-602
Number of pages6
ISSN0021-8898
DOIs
Publication statusPublished - Jun 2023

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