Method of measuring dimensionless coupling constant of magnetic structure

#The application claims priority to Taiwan Application Serial Number 100123535, filed Jul. 4, 2011, which is herein incorporated by reference.

#1. Technical Field

#The present invention relates to a method of measuring a dimensionless coupling constant of a magnetic structure.

#FIG. 1A is a schematic diagram showing the relations between the saturation magnetization MS of the magnetic structure and the composition, and between the coercivity Hc of the magnetic structure and the composition;

#FIG. 1B is a schematic diagram showing the relations between the net magnetization MNET of the magnetic structure and the temperature, and between the coercivity Hc of the magnetic structure and the temperature;

#FIG. 2 is a schematic diagram showing that the magnetization and the direction thereof based on the RE-dominant;

#Since RE magnetization MR and TM magnetization MT has the same quantity and opposite directions (anti-parallel) when the magnetic structure is kept at the compensation point Tcomp, the sum of the magnetization MS is zero. Meanwhile, when an external parallel magnetic field is applied to the magnetic structure, the slant angles of RE magnetization MR and TM magnetization MT will be different. Therefore, a parallel magnetization M// parallel to the magnetic structure can be obtained, thereby simplifying the solution of Etot equation. Further, when MR=MT (MS=0) and α=90°, the total parallel magnetization M// can be written as

#M // = M R ⁢ sin ⁢ ⁢ θ R - M τ ⁢ sin ⁢ ⁢ θ T = H λ ;

#accordingly,