Klimko Sergey, Zhernenkov Kirill, Toperverg Boris P, Zabel Hartmut
Laboratoire Léon Brillouin, 91191 Gif-sur-Yvette, France.
Rev Sci Instrum. 2010 Oct;81(10):103303. doi: 10.1063/1.3495965.
We report on a new setup developed for neutron scattering experiments in periodically alternating magnetic fields at the sample position. The assembly consisting of rf generator, amplifier, wide band transformer, and resonance circuit. It allows to generate homogeneous ac magnetic fields over a volume of a few cm(3) and variable within a wide range of amplitudes and frequencies. The applicability of the device is exemplified by ac polarized neutron reflectometry (PNR): a new method established to probe remagnetization kinetics in soft ferromagnetic films. Test experiments with iron films demonstrate that the ac field within the accessible range of frequencies and amplitudes produces a dramatic effect on the PNR signal. This shows that the relevant ac field parameters generated by the device match well with the scales involved in the remagnetization processes. Other possible applications of the rf unit are briefly discussed.
我们报告了一种新装置，该装置是为在样品位置的周期性交变磁场中进行中子散射实验而开发的。该组件由射频发生器、放大器、宽带变压器和谐振电路组成。它能够在几立方厘米的体积内产生均匀的交流磁场，并且在很宽的幅度和频率范围内可变。该装置的适用性通过交流极化中子反射测量法（PNR）得到了例证：这是一种用于探测软铁磁薄膜中再磁化动力学的新方法。对铁膜的测试实验表明，在可达到的频率和幅度范围内的交流磁场对PNR信号产生了显著影响。这表明该装置产生的相关交流磁场参数与再磁化过程中涉及的尺度匹配良好。还简要讨论了射频单元的其他可能应用。
