Rare earth substitutions in M-type ferrites

Author

Grössinger, R. ; Küpferling, M. ; Blanco, J. C Tellez ; Wiesinger, G. ; Müller, M. ; Hilscher, G. ; Pieper, M.W. ; Wang, J.F. ; Harris, I.R.

Author_Institution

Inst. for Solid State Phys., Univ. of Technol., Vienna, Austria

Volume

39

Issue

5

fYear

2003

Firstpage

2911

Lastpage

2913

Abstract

In hexaferrites of the composition SrFe₁₂O₁₉ (SrM), Sr was substituted by R = La, Sm, and Nd. The precursors were weighed according to different Sm³⁺/Sr²⁺ ratios (n = Sm³⁺/Sr²⁺), where n was varied between 1/16 and 1/2. The samples were produced by hydrothermal synthesis. The effects of the rare earth substitution on the magnetic properties were investigated, measuring magnetization and magnetocrystalline anisotropy but also applying Mossbauer spectroscopy and nonmagnetic resonance. Nd and Sm substitution increases the intrinsic coercivity without causing any significant deterioration in either the saturation magnetization or the remanence, whereas La substitution has only a small effect on the intrinsic coercivity of SrM.

Keywords

Mossbauer effect; alloying additions; ferrites; lanthanum; magnetic anisotropy; magnetisation; neodymium; remanence; samarium; strontium compounds; M-type ferrites; Mossbauer spectroscopy; SrFe₁₂O₁₉:La; SrFe₁₂O₁₉:Nd; SrFe₁₂O₁₉:Sm; hydrothermal synthesis; magnetization; magnetocrystalline anisotropy; nonmagnetic resonance; rare earth substitution; remanence; Anisotropic magnetoresistance; Coercive force; Ferrites; Magnetic anisotropy; Magnetic properties; Magnetic resonance; Neodymium; Perpendicular magnetic anisotropy; Saturation magnetization; Strontium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.815745

Filename

1233257