next up previous contents
Next: Single particle Up: Micromagnetic Simulation of Bonded Previous: Introduction

Simulation parameters

  The microstructure of the magnets is modeled by hexahedrons of $20 \times 20 \times 80$ nm size representing magnetic particles. A single particle consists of 16 grains, which are cubes of 10 nm edge length. Two phases have been considered: A hard magnetic Nd2Fe14B rich phase (red cubes) and a soft magnetic phase of Fe3B(blue). The material parameters are given in table 3. The grains have been arranged in a checkerboard like pattern.


 

 
Table 3: Material parameters
Parameter Nd2Fe14B Fe3B
Exchange constant A [J/m] 1.25e-11 1.25e-11
Saturation polarisation Js [T] 1.61 1.615
Type of anisotropy easy axis easy plane
Anisotropy constant K1 [J/m3] 4500000 322000
Anisotropy constant K2 [J/m3] 660000  
Exchange length $l_{ex}=\sqrt{A/K_1}$ [nm] 1.6 6.23


 
Werner Scholz
1/30/1999