Magnetism in La substituted Sr hexaferrite

Magnetism in La substituted Sr hexaferrite
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La取代的Sr六方铁氧体的磁性

DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Reißner
M. Reißner
中科院分区：
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文献类型：
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作者：
M. Küpferling;P. Novák;K. Knížek;M. Pieper;R. Grössinger;G. Wiesinger;M. Reißner

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使用密度泛函理论和广义梯度近似 (GGA) 计算 LaxSr1−xFe12O19 (x=0, 0.25, 0.5, 0.75, 1) 六方铁氧体的电子结构。 GGA+U方法用于改进强相关Fe 3d电子的描述。计算了 La 取代引入的 Fe 亚晶格偏好磁矩。将结果与在 4.2 K 下振动样品磁力计中进行的磁化强度测量进行比较，从中得出 La 六方铁氧体的每晶胞磁矩。开始计算是为了找到对含有 La 的 M 型六角铁氧体的磁晶各向异性的异常行为的解释，这一现象已通过奇点检测测量得到证实。
The electronic structure of LaxSr1−xFe12O19 (x=0, 0.25, 0.5, 0.75, 1) hexaferrite is calculated using the density functional theory and generalized gradient approximation (GGA). The GGA+U method is used to improve the description of strongly correlated Fe 3d electrons. Fe-sublattice preferences for the magnetic moments introduced by La substitution were calculated. The results are compared with measurements of the magnetization performed in a vibrating sample magnetometer at 4.2 K, from which the magnetic moment per unit cell of La hexaferrite was derived. The calculations were started in order to find an explanation for the extraordinary behavior of the magnetocrystalline anisotropy of La containing M-type hexaferrites, which was confirmed by singular point detection measurements.