A spin-wave resonance study on reentrant Ni77Mn23 thin films

M. Özdemir, B. Aktaş, Y. Öner, T. Sato, T. Ando

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The magnetic properties of thin (300 Å) reentrant Ni77Mn23 films grown on a quartz substrate using the electron beam evaporation technique have been investigated. The spin-wave resonance (SWR) technique has been used to study the exchange parameter D and magnetic anisotropies as a function of temperature between 4 and 300 K. The SWR spectra exhibit directional character upon cooling the sample in an external field Hc, which is a sign of a spin-glass property. At higher temperatures, in addition to the dominant surface SWR mode, there is a much weaker bulk mode on the lower field side. Using a uniaxial surface and effective bulk anisotropy together we simulated the experimental spectra and deduced the surface anisotropy and magnetic stiffness parameters as a function of temperature. The sample shows an easy plane surface anisotropy. Both the exchange and anisotropy parameters increase when the temperature is in the spin-glass regime. Furthermore, the surface anisotropy energy dominates the overall magnetic behavior of this system.

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume164
Issue number1-2
DOIs
Publication statusPublished - 1996 Nov

Keywords

  • Ferromagnetism
  • Reentrant
  • Spin-wave resonance
  • Surface anisotropy
  • Thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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