"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Strontium ferrite for magnetic recording prepared by self-combustion method

C. DOROFTEI1,2,* , E. REZLESCU2, N. REZLESCU2, F.TUDORACHE2, P. D. POPA2

Affiliation

  1. Faculty of Physics, A.I. Cuza University, Carol I Boulevard, RO-7000506 Iasi, Romania
  2. Institute of Technical Physics, Bd. D. Mangeron 47, 700050 Iasi, Romania

Abstract

In the last time, the M-type hexagonal ferrites (BaFe12O19 and SrFe12O19) have drawn a great interest for magnetic recording media because of their large coercivity which is derived from magnetocrystalline anisotropy and small particle size. Rare-earth substituted strontium ferrite nanopowders SrFe12-xRxO19 (R = La, Gd and Er; x = 0.2, 0.5 and 1) were prepared by self-combustion method. In this method one realizes an optimum mixing of ions on the atomic level so that the crystallization of hexaferrite particles can occurs at relatively low temperatures. The combusted powders were annealed at different temperatures (800, 900 and 1000 oC) for various annealing times (5, 10, 20, 40, 80, 160 and 320 minutes). The results of X-ray diffraction measurements showed the M-type hexagonal structure formation by heat treatments. Magnetic properties as well as microstructure depend on heat treatment conditions. We believe that further investigations are necessary to explain why in the nanoparticles system the heat treatment time influence on the coercivity is much stronger compared to the heat treatment temperature.

Keywords

Hexaferrites, Rare-earth, Microstructure, Magnetic properties, Self-combustion.

Submitted at: Sept. 1, 2008
Accepted at: Nov. 11, 2008

Citation

C. DOROFTEI, E. REZLESCU, N. REZLESCU, F.TUDORACHE, P. D. POPA, Strontium ferrite for magnetic recording prepared by self-combustion method, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 2919-2923 (2008)