RF-Mossbauer study of the magnetic properties of nanocrystalline alloys

Michal Kopcewicz 

Institute of Electronic Materials Technology (ITME), Wólczyńska 133, Warszawa 01-919, Poland

Abstract

The current status of the Mossbauer investigations of the soft magnetic nanocrystalline alloys produced by utilizing the first step of crystallization of amorphous alloys is discussed. Conventional Mossbauer measurements allow the identification of phases formed due to annealing of amorphous precursor and the evaluation of their relative content.
Unconventional rf-Mossbauer studies utilizing radio-frequency (rf) fields provide information on the soft magnetic nature of the alloys by observing the degree of rf-induced collapse of the hyperfine fields. The Mossbauer experiment in which the rf collapse and rf sidebands effects are used allows the soft nanocrystalline bcc phase to be distinguished from magnetically harder microcrystalline ones.
Qualitative information concerning the distribution of anisotropy fields in the nanocrystalline grains can be inferred from the dependence of the rf collapsed spectra on the rf field intensity. The rf-sidebands effect reveals changes of magnetostriction due to the formation of the nanocrystalline phase. The rf-Mossbauer technique provides a unique opportunity to study the microsctucture and magnetic properties of each phase formed in the amorphous precursor.
The principles of the rf-Mossbauer technique and examples of its application will be discussed for FeZrB(Cu) and FeNiZrB nanocrystalline alloys.

Related papers
  1. Structural transformations and magnetic properties of Fe60Pt25-xB15+x alloys
  2. Magnetic studies of metallopolymeric nanocomposite produced by thermal decomposition of iron acrylate complex
  3. Moessbauer spectroscopy, interlayer coupling and magnetoresistance of irradiated Fe/Cr multilayers

Presentation: oral at E-MRS Fall Meeting 2003, Symposium B, by Michal Kopcewicz
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-07-11 15:03
Revised:   2009-06-08 12:55
Google
 
Web science24.com
© 1998-2018 pielaszek research, all rights reserved Powered by the Conference Engine