Controlling the magnetic structure in W-type hexaferrites

DOI: 10.1107/S1600576723002133

Authors: Mathias I. Mørch (Aarhus Universitet) , Mogens Christensen (Aarhus Universitet)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Applied Crystallography , VOL 56

State: Published (Approved)
Published: June 2023
Diamond Proposal Number(s): 24845

Abstract: W-type hexaferrites with varied Co/Zn ratios were synthesized and the magnetic order was investigated using neutron powder diffraction. In SrCo2Fe16O27 and SrCoZnFe16O27 a planar (Cm′cm′) magnetic ordering was found, rather than the uniaxial ordering (P63/mm′c′) found in SrZn2Fe16O27 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 SrCoZnFe16O27 and uniaxial ordering in SrZn2Fe16O27, 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 SrCo2Fe16O27 and SrCoZnFe16O27, and Curie temperatures of 780 and 680 K, respectively, while SrZn2Fe16O27 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.

Journal Keywords: hexaferrites; magnetic ordering; neutron diffraction; multiferroics

Subject Areas: Chemistry, Materials, Physics


Instruments: I11-High Resolution Powder Diffraction

Added On: 17/04/2023 09:35

Documents:
Journal of Applied Crystallography - 2023 - M rch - Controlling the magnetic structure in W%E2%80%90type hexaferrites.pdf

Discipline Tags:

Physics Physical Chemistry Electronics Chemistry Magnetism Materials Science

Technical Tags:

Diffraction X-ray Powder Diffraction