场致自旋重取向[Fe/Cr]n多层膜的核共振反射率研究
Field induced spin reorientation in [Fe/Cr]n multilayers studied by nuclear resonance reflectivity
摘要：
采用深度分辨核共振反射率（NRR）方法研究了[57 Fe（3 nm）/Cr（1.2nm）] × 10多层膜在外场作用下的磁化强度演化.在SPring-8的BL 09 XU站，在不同的外场值（从0到1500 Oe）下进行了测量。为了提高深度分辨率和结果的可靠性，我们将不同掠射角下的延迟反射率曲线与核共振反射率时间谱进行了联合拟合。我们第一次表明，方位角，这是在所有的文件中使用专门的磁化剖面测定，具有更复杂的物理意义，由于部分相干平均的散射振幅从磁性横向域。我们描述了如何从确定的“有效方位角”中选择真实方位角的方法。最后，我们得到了非共线的扭曲磁化深度分布，自旋翻转状态出现在不同的57 Fe层中，随着外加磁场的增加。
英文摘要：
We present the depth-resolved nuclear resonance reflectivity (NRR) studies of the magnetization evolution in [57Fe(3 nm)/Cr(1.2 nm)]*10 multilayer under the applied external field. The measurements have been performed at the station BL09XU of SPring-8 at different values of the external field (from 0 up to 1500 Oe). We apply the joint fit of the delayed reflectivity curves and the time spectra of the nuclear resonance reflectivity measured at different grazing angles for enhancement of the depth resolution and reliability of the results. For the first time we show that the azimuth angle, which is used in all papers devoted to the magnetization profile determination, has more complicated physical sense due to the partially coherent averaging of the scattering amplitudes from magnetic lateral domains. We describe the way how to select the true azimuth angle from the determined "effective azimuth angle". Finally we obtain the noncollinear twisted magnetization depth-profiles where the spin flop state appears sequentially in different 57Fe layers at increasing applied field.
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