Influence of rare earth (Gd, Dy or Sm) dopants on the magnetic properties and microstructure of Nd60-xRExFe30Al10 alloys

Bartosz Michalski ,  Waldemar Kaszuwara ,  Jerzy Latuch ,  Marcin K. Leonowicz 

Warsaw University of Technology, Faculty of Materials Science and Engineering, Woloska 141, Warsaw 02-507, Poland

Abstract

The effect of partial substitution of Gd, Dy and Sm for Nd in Nd60-xRExFe30Al10 alloys for the magnetic properties and microstructure was studied. Each of the elements used has different influence on the magnetic properties of the (Nd, RE)-Fe-Al alloys. Gd substantially increases the coercivity, even at as high concentrations as 20%. Addition of Gd does not change neither the initial magnetization curve nor the initial susceptibility. Similarly high coercivity increase can be achieved by addition of up to 5% of Dy. For higher Dy contents a dramatic drop of the coercivity was observed. Introduction of Sm leads to deterioration of the magnetic properties, even at as small concentrations as 1%. All the additional elements studied decrease the saturation magnetization and remanence. Additions of  Dy, Gd and Sm, which partly substitute Nd in the Nd60Fe30Al10 alloy, leads to formation of crystalline precipitates. In the case of Dy these precipitates are formed by MgCu2 type phase. In the Sm doped alloy the size of the crystalline precipitates, visible in the amorphous matrix, are about twice of those, which are present in the dopant free alloy.

 

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium H, by Bartosz Michalski
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-25 10:53
Revised:   2009-06-07 00:48