Controlling disorder-mediated exchange bias in (Mn,Zn,Fe)3O4 thin films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

2 Scopus Citations
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Author(s)

  • U. S. Alaan
  • G. Sreenivasulu
  • C. Jenkins
  • P. Shafer
  • E. Arenholz
  • G. Srinivasan
  • Y. Suzuki

Detail(s)

Original languageEnglish
Pages (from-to)129-136
Journal / PublicationJournal of Magnetism and Magnetic Materials
Volume405
Publication statusPublished - 1 May 2016
Externally publishedYes

Abstract

We report exchange bias in (Mn,Zn,Fe)3O4 thin films that are compositionally homogeneous. We show that exchange bias in these Mn-Zn ferrite (MZFO) films can be tuned quite easily through annealing of the as-deposited films. The annealing process increases the crystallinity, as measured by X-ray diffraction (XRD). This improvement in crystallinity is accompanied by lower coercive fields, lower exchange bias fields, and higher saturation magnetizations. Exchange bias in these nominally homogeneous ferrite films is correlated with the degree of both structural and magnetic disorder. Based on the annealing experiments, we believe that these MZFO films may consist of crystalline regions that are separated from one another by disordered regions of the same nominal composition. The disordered regions serve to exchange bias the more structurally and magnetically ordered crystalline MZFO grains, leading to a shift of the magnetic hysteresis loop. Together these results indicate that the magnitude of the exchange bias can be controlled by tuning the degree of crystallinity in the system.

Research Area(s)

  • Coercivity, Complex oxide, Exchange bias, Magnetization, Nanocrystalline, Spinel ferrite

Citation Format(s)

Controlling disorder-mediated exchange bias in (Mn,Zn,Fe)3O4 thin films. / Alaan, U. S.; Sreenivasulu, G.; Yu, K. M.; Jenkins, C.; Shafer, P.; Arenholz, E.; Srinivasan, G.; Suzuki, Y.

In: Journal of Magnetism and Magnetic Materials, Vol. 405, 01.05.2016, p. 129-136.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal