YIG中生长感生磁各向异性的来源

THE ORIGIN OF GROWTH-INDUCED MAGNETIC ANISOTROPY IN YIG

为了研究YIG中生长感生磁各向异性的来源,穆斯堡尔测量扩展到低温。发现在170K以下,K_u为负,即有一自旋再取向。计算表明,0.01%Fe^(2+)的单离子各向异性可以说明观察到的K_u(T),假定Fe^(2+)离子优先占据除(1/4 1/4 1/4)和(3/4 3/4 3/4)外的八面体晶位。

Quantitative information about tie growth-induced magnetic anisotropy in Y1G was obtained from Mossbauer spectrum in a previous note~[2]. In order to study the origin of this anisotropy, Mossbauer measurements were extended to low temperatures. We discover that below 170 k, Ku is negative, i-e., there is a spin reorientation. Calculations show that single-ion anisotropy of 0.01/Fe^(2+) may account for the observed Ku(T), if Fe^(2+) ions are assumed to occupy preferentially octahedral sites except (1/4 1/4 1/4) and (3/4 3/4 3/4)