Sputter 薄膜의 垂直磁氣異方性과 回轉履歷損失 = Perpendicular Magnetic Anisotropy and Rotational Hysteresis Loss in Sputtered Thin Films

다국어 초록 (Multilingual Abstract)

Magnetization(Ms), magnetic perpendicular anisotropy constant(??), sin 2θ and sin 4θ component of Ku (??,??), rotational hysteresis loss(??) and rotational hysteresis loss integral(J) of sputtered ?? film and amorphous ?? film are obtained from measurement of the magnetic torque and M-M loop. The samples show suitable characteristics as a vertical magnetic recording media.
Field dependence of ?? and ?? of the samples exhibits complex changes with increasing external field.
After annealing, magnetization and perpendicular anisotrory constant of the films increased in CoCr but decreased in Gd Tb Fe, respectively, but distribution of ?? of the films does not implied transitional change of magnetization mode.
It is presented a magnetization mode considered the Ganssian type random uniaxial anisotropy as well as ordinal uniaxial anisotropy. The mode utilized to analyse distribution of magnetic dispersion and rotational hysteresis loss in the films but the mode is not utilized to check the magnetization reversal mode.
On the basis of calculated critical diameter of colmn(??), at which the magnetization reversal transition occurs from coherent rotation to curling, distribution of anisotropy, rotational hysteresis loss integral(J) and of observed columnar diameter of the films or magnetic bubble observations of other worker, proposed the magnetization reversal modes occurs in CoCr film and in GdTbFe film.