A new MIEZE technique for investigating relaxation of magnetic nanoparticles
A new MIEZE technique for investigating relaxation of magnetic nanoparticles
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DOI：
10.1016/j.nima.2008.11.101
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发表时间：
2009-02
影响因子：
1.4
通讯作者：
H. Hayashida;M. Hino;M. Kitaguchi;N. Achiwa;Y. Kawabata
中科院分区：
文献类型：
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作者：
H. Hayashida;M. Hino;M. Kitaguchi;N. Achiwa;Y. Kawabata
即使发生磁散射，零努力（MIEZE）信号的调制强度的对比度也没有降低，而中子自旋回波和中子共振自旋回波的对比度降低了两倍以上。然而，由于MIEZE测量准弹性核散射和磁散射的强度，因此通常不容易使用常规MIEZE设置来同时分离磁性纳米级颗粒的磁波动和磁波动。我们提出了一种新的MIEZE技术，它涉及到插入第二个分析器和一个额外的π-鳍状物，能够区分磁和磁准弹性散射强度。我们利用这种新技术成功地观测到了磁流体中磁铁矿粒子的超顺磁涨落。
There is no reduction in the contrast of a modulated intensity of zero effort (MIEZE) signal even when magnetic scattering occurs, whereas the contrasts of neutron spin echo and neutron resonance spin echo are reduced by more than a factor of two. However, since MIEZE measures both the intensities of quasielastic nuclear and magnetic scatterings, it is generally not easy to use a conventional MIEZE setup to simultaneously separate magnetic and nonmagnetic fluctuations of magnetic nanoscale particles. We propose a new MIEZE technique, which involves inserting a second analyzer and an additional π-flipper that is able to distinguish between the magnetic and nonmagnetic quasielastic scattering intensities. We succeeded in observing superparamagnetic fluctuations of magnetite particles in a ferrofluid by using this new technique.