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要形成垂直磁化膜,必须要有足够强的垂直磁各向异性能,使得由于磁化而产生的退磁场能量不足以让磁化矢量位于膜面内。在垂直磁记录情形下,针对垂直磁各向异性常数Ku、磁化矢量M与外加磁场Hext成θ角的情况进行了理论分析。在满足磁化矢量与外加磁场方向之间的夹角稳定的平衡条件和稳定性条件的基础上,分析得知:只有满足磁各向异性常数Kn大2πM这一关系的物质才可能形成垂直磁化膜。
To form a perpendicular magnetization film, it is necessary to have a sufficiently strong perpendicular magnetic anisotropy energy that the energy of the demagnetizing field due to the magnetization is not sufficient to locate the magnetization vector in the film plane. In the case of perpendicular magnetic recording, the theoretical analysis is made for the case where the vertical magnetic anisotropy constant Ku, the magnetization vector M and the applied magnetic field Hext form an angle θ. On the basis of satisfying the equilibrium conditions and the stability conditions of the included angle between the magnetization vector and the direction of the applied magnetic field, it is found that only the material that satisfies the relationship of 2πM and 2πM, which is the magnetic anisotropy constant, can form a perpendicular magnetization film .