Corrosion of highly coercive, highly textured Nd-Fe-B films

Author

Fähler, Sebastian ; Hannemann, Ullrich ; Oswald, Steffen ; Neu, Volker ; Holzapfel, Bernhard ; Schultz, Ludwig

Author_Institution

IFW Dresden, Germany

Volume

39

Issue

5

fYear

2003

Firstpage

2950

Lastpage

2952

Abstract

The stability and corrosion of highly coercive and highly textured Nd-Fe-B films is examined. The rapid degradation of coercivity within hours after deposition and the relatively slow reduction of remanence and magnetic texture together with depth profile analysis show that oxidation of the Nd-rich intergranular phase is the first step of corrosion. Consequences on coercivity are discussed together with a reduction of the local anisotropy field at the surface. For applications of thin Nd-Fe-B films degradation can be inhibited by covering with a Cr protection layer.

Keywords

boron alloys; coercive force; corrosion; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic thin films; neodymium alloys; oxidation; permanent magnets; remanence; texture; Cr; Cr protection layer; Nd-Fe-B; Nd-rich intergranular phase; depth profile analysis; hard magnetic films; highly coercive highly textured Nd-Fe-B films; local anisotropy field; magnetic texture; oxidation; rapid degradation of coercivity; rare earth permanent magnets; remanence; stability; Coercive force; Corrosion; Degradation; Magnetic analysis; Magnetic anisotropy; Magnetic films; Oxidation; Perpendicular magnetic anisotropy; Remanence; Stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.815756

Filename

1233269