Improvement in Magnetic Properties of PLD-Made Nd-Fe-B Thick Film Magnets

Author

Nakano, M. ; Takeda, H. ; Yamashita, F. ; Yanai, Takeshi ; Fukunaga, H.

Author_Institution

Dept. of Electr. & Electron. Eng., Nagasaki Univ., Nagasaki

Volume

44

Issue

11

fYear

2008

Firstpage

4199

Lastpage

4201

Abstract

Coercivity of pulsed laser deposition (PLD)-fabricated Nd-Fe-B thick film magnets were enhanced by synergistic use of an additive (Zr, Nb or Ga) and an adoption of pulse annealing as a high-speed crystallization method. The role of the additives and the pulse annealing mainly work on the increase of coercivity without the deterioration of remanence and (BH)_max. For example, after pulse annealing of an as-deposited film prepared from a Nd_2.6Fe₁₄B+Ga_0.5 _at.% target, the obtained coercivity reached approximately 1700 kA/m. We also found that (BH)_max value reaches approximately 70 kJ/m³ by reducing Nd content and adding Zr or Nb.

Keywords

additives; annealing; boron alloys; coercive force; gallium alloys; iron alloys; magnetic thin films; neodymium alloys; niobium alloys; permanent magnets; pulsed laser deposition; remanence; zirconium alloys; NdFeBGa; NdFeBNb; NdFeBZr; coercivity; high-speed crystallization method; magnetic property; pulse annealing; pulsed laser deposition; remanence; thick film magnets; Coercivity; pulsed laser deposition; remanence; thick film magnets;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2008.2001492

Filename

4717585