反磁化

The magnetic alignment is thus enhanced, and it can be further improved by lowering the deformation rate and increasing the deformation ratio of the matrix grains.

并且形变织构还可通过增大主相晶粒变形率和降低变形速率进一步得到增强；(2)新型磁体的反磁化过程受反向畴形核控制。

We used DGY 2 permanent measurement meter to measure the magnetic properties and demagnetization curve .

对 15 78B7基一系列不同工艺条件下制取的取向度不同的烧结磁体，用 X-射线衍射和磁性测量来分析永磁体织构和取向度与反磁化过程的关系，用 DGY- 2型永磁测量仪测试磁体退磁曲线。

For SmCo single-layer film, the interaction between internal particles at 423 K is much intense during demagnetization.

在SmCo/FeCo双层双相复合膜中，随着软磁层厚度的逐渐增加，在反磁化过程中内部粒子之间的相互作用大小也是逐渐增强。

Stress effects in the magnetization and demagnetization characters of the patterned FeCoSiB elements are studied based on the model above.

利用这一模型，研究了应力对亚微米尺寸FeCoSiB图形化单元磁化与反磁化特征的影响规律。

The measured degree relations of coercivity and remanence coercivity of the oriented BaF particulate samples can be explained by the Fanning process of the model of oblate ellipsoid chain.

扁旋转椭球链的扇对称反磁化过程可以比较好地解释取向BaF磁粉样品矫顽力和剩磁矫顽力角度关系的实验结果。

Keywords: Domain structure;Microstructure;Magnetic properties; Magnetizing and demagnetized mechanism; Nanocrystalline composite magnets

中文关键词：畴结构；显微结构；磁性能；磁化与反磁化；纳米复合永磁材料

As nanocrystalline permanent magnets are quite different from traditional permanent magnets, the effect of intergrain exchange coupling on magnetic viscosity has been investigated in nanocrystalline rare-earth permanent magnets.

纳米晶永磁不同于传统的永磁材料，本项目研究了纳米稀土永磁中晶间交换耦合作用对磁粘滞的影响以及材料的反磁化机制与磁粘滞性的内在关系。

In the range of this temperature, the coercive mechanism of NdDyFeB and NdDyFeBSn have been analysed with Gaunt's model on the basis of magnetic viscosity parameters. The coercivity of the former is controlled by weak pinning of domain wall, but the latter is determined by strong pinning.

根据磁后效测量数据，进一步用Gaunt的钉扎模型分析NdDyFeB及NdDyFeBSn合金在150℃以上的矫顽力机制，发现此时，前者的反磁化过程由畴壁弱钉扎控制，而后者由畴壁强钉扎控制。

First, the effects of magnetic RAM relaxation time and the rise-time of incident pulse signal on reflection signal are discussed, the relationship between the rise-time of incident pulse and relaxation time based on the energy of reflection signal is revealed. Then, the effects of magnetic hysteric, susceptibilities and saturation upon reflection signal are analyzed, the results reveal the reflection of RAM target and UWB signal design. In the meantime, dielectric relaxation time effect about dielectric RAM target is analyzed simply, and the effects of relaxation time and the width of incident pulse upon reflection signal are probed. Finally, a few RAM targets are measured in the chamber using the impulse radar experiment system which is developed by the team of anti-stealth impulse radar on Department of Electrical Engineering, National University of Defense Technology. The experimental results show the similarity of the rule of echos with the theory. From the compared results of different tagets, we concluded, compared with 15% wideband sinusoidal signal, the impulse signal has increased 10～12dB energy from the same loaded RAM target; this, in turn, shows the nonlinear effects of RAM to the echoes, and the potentiality of the impulse signal to RAM targets.

首先分析了磁性RAM的弛豫时间及入射脉冲信号的上升时间对反射信号的影响，从反射信号能量角度出发，给出了入射脉冲上升时间与弛豫时间的关系；接着分析了磁性RAM的磁滞特性、磁化率及磁化强度对反射信号的影响，给出了RAM目标辐射和有关UWB信号设计的一般性结论；其次，对介电RAM的弛豫时间效应作了简单的分析，探讨了介电弛豫时间及入射脉冲宽度对反射信号的影响；最后利用国防科技大学电子技术系&反隐身冲激雷达技术研究组&研制的冲激雷达实验系统，在微波暗室中对几种不同的RAM目标进行了测量，结果表明：其反射波形的基本规律与上述理论分析相一致；从各种不同目标回波的能量对比结果得出，涂覆RAM目标对冲激信号的吸收比15％带宽的正弦信号要小10～12dB，证实了RAM的非线性效应对回波的影响，也证实了冲激信号反隐身的潜力。

ABSTRACT Influence of domain structures and induced magnetic anisotropies Ku on magnetic properties in amorphous are studied systematically by domain observations.

本文通过对不同形态非晶合金的磁畴形貌及反磁化过程的观察分析，系统地研究了各种磁各向异性分布对非晶磁性的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。