Slow magnetic dynamics in the K3M3IIM2IIIF15 multiferroic system

Scientific paper - Original scientific paper

• Author: Damir Pajić
• Author: Zvonko Jagličić
• Author: Zvonko Trontelj
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

K3Fe5F15 is a multiferroic material belonging to the K3M3IIM2IIIF15 family. Zero-field cooled and field cooled magnetization measured as a function of temperature demonstrate magnetic transition in K3Fe5F15, K3Fe3Cr2F15, and K3Cu3Fe2F15. Complementary to this, the magnetic behavior below the magnetic transition was studied via magnetic relaxation at different temperatures after switching magnetic field from H to −H. A slow change of magnetization on the hours time scale was observed and it was best described by a logarithmic time dependence for all three compounds over a broad temperature and field range. It follows that a distribution of magnetic moments over anisotropy barriers, which block the magnetic moments against reorientation, is present. We introduced a model of thermal activation of the magnetic moments of regions distributed over the barriers to describe the temperature and field dependence of the relaxation parameters. The dimensions of these magnetic regions were estimated to be of nanometer size.

• Keywords (english): antiferromagnetic materials; chromium compounds; copper compounds; ferroelectric materials; ferromagnetic relaxation; iron compounds; magnetic anisotropy; magnetic cooling; magnetic moments; magnetic transition temperature; magnetoelectric effects; multiferroics; nanomagnetics; nanostructured materials; potassium compounds
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Journal of Applied Physics
• Numbering: vol. 112, no. 7, 073908
• p-ISSN: 0021-8979
• e-ISSN: 1089-7550
• DOI: https://doi.org/10.1063/1.4757006
• URN:NBN: urn:nbn:hr:217:462881
• Publication: 2012
• Document URL: https://aip.scitation.org/doi/10.1063/1.4757006
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
• Created on: 2019-11-15 19:07:35