Temperature dependence of the magnetization of canted spin structures

Henrik Jacobsen, Kim Lefmann, Erik Brok, Cathrine Frandsen, Steen Mørup

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Numerous studies of the low-temperature saturation magnetization of ferrimagnetic nanoparticles and diamagnetically substituted ferrites have shown an anomalous temperature dependence. It has been suggested that this is related to freezing of canted magnetic structures. We present models for the temperature dependence of the magnetization of a simple canted spin structure in which relaxation can take place at finite temperatures between spin configurations with different canting angles. We show that the saturation magnetization may either decrease or increase with decreasing temperature, depending on the ratio of the exchange coupling constants. This is in agreement with experimental observations.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume324
Issue number19
Pages (from-to)3218-3222
ISSN0304-8853
DOIs
Publication statusPublished - 2012

Keywords

  • Nanoparticle
  • Ferrite
  • Spin canting
  • Magnetization
  • Magnetic relaxation

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