Co/Pd压力梯度介质中磁梯度的直接观测
Direct Observation of Magnetic Gradient in Co/Pd Pressure-Graded Media
摘要：
本文用磁测量和中子散射方法研究了压力梯度Co/Pd多层膜的磁性。多层结构的分级通过在样品的溅射期间改变沉积压力来完成。磁深度剖析极化中子反射直接表明，压力梯度样品，磁化强度显着变化，从一个压力区域到下一个，而控制样品溅射在均匀的压力表现出基本上均匀的磁深度分布。互补的磁力测量结果表明，所观察到的梯度磁剖面部分是由于在逐渐更高的压力下沉积的区域的饱和磁化强度降低。增加沉积压力，以增加结晶度，并为梯度样品，在磁滞回线中的离散步骤的情况下，意味着在不同的压力下沉积的区域之间的交换耦合。
英文摘要：
Magnetometry and neutron scattering have been used to study the magnetic properties of pressure graded Co/Pd multilayers. The grading of the multilayer structure was done by varying the deposition pressure during sputtering of the samples. Magnetic depth profiling by polarized neutron reflectometry directly shows that for pressure-graded samples, the magnetization changes significantly from one pressure region to the next, while control samples sputtered at uniform pressure exhibit essentially uniform magnetic depth profiles. Complementary magnetometry results suggest that the observed graded magnetic profiles are due in part to a decrease in saturation magnetization for regions deposited at progressively higher pressure. Increased deposition pressure is shown to increase coercivity, and for graded samples, the absence of discrete steps in the hysteresis loops implies exchange coupling among regions deposited at different pressures.
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