The improved theory have succeeded in applying to gaussian model . in the third chapter , based on the single - spin transition dynamics , we discuss the time evolution of the local magnetization in the anisotropic three - dimensional xy model under the zero external field 第三章在单自旋跃迁临界动力学的基础上，讨论零场下三维( 3d )各向异性晶格上xy模型的局域磁化强度的时间演化。
It is found that the specific saturation magnetization decreases with the decrease of the nanocrystallites grain size . the dominating reason is the grain size of the nanocrystallites less than the critical size of the single magnetic domain 发现对于纯净的纳米晶粒来说，饱和磁化强度随着晶粒线度的减小而减小，这主要是因为所制备的纳米晶微粒的晶粒线度小于单畴颗粒的临界粒径。
The comparison between the magnetic properties of ndfeb magnet by microwave magnetic field sintering and those of magnet by conventional sintering technology shows that the brwas improved 50 % , the hcb was improved 8 % , and the ms was improved 40 % 将微波磁场烧结的磁体与常规烧结磁体进行磁性能比较表明：微波磁场烧结出的磁体剩磁提高了将近50 ，矫顽力提高了8 ，饱和磁化强度提高了40 。
( 2 ) the shear stresses vary as the relative permeability of the matrix fluids , the volume fraction of particles , and the square of the particles " magnetization . the shear stresses increase with the external magnetic field , but have saturation values 磁流变液的剪切应力随基液磁导率、磁性固体粒子浓度呈线性正比关系，随磁性固体粒子的磁化强度呈平方正比关系，随着外加磁场的增大而迅速增大。
In the calculation , we found that indirect exchange of rare earth ion has vital function on the calculation of magnetization and magneto - optical properties . there is some difference between the calculated data and the theoretical data using the current theory 计算中作者研究发现，用量子理论在计算磁化强度和磁特性时，稀土离子的王维ergag石榴石磁特性的研究间接交换作用对其影响也是至关重要的。
The effects of the different kinds of rare earths and the doping amount of them on magnetic properties of bafe , 2o19 ultrafine powders ( including the specific saturation magnetization , the specific remanent magnetization and coercive force ) were firstly discussed systematically 首次查明了钡铁氧体粉末的磁性能(包括比饱和磁化强度、比剩余磁化强度和内禀矫顽力)随稀土元素种类及其掺杂量的变化规律。
As to the paramagnetic ergag , the whole maganetization is zero . the crystal energy levels will split further when the magnetic field is parallel to the especial four directions . we - gain the according wave function and the magnetization changing with the magnetic field 考虑了外磁场沿晶体四个方向磁化时，晶场能级的进一步劈裂以及得出了其相应的波函数，从而分析了不同磁化方向磁化强度随外磁场的变化关系。
The influence on the magnetism and the electron spin resonance ( esr ) over a wide range of composition and temperature have been studied systematically . an obvious symmetric esr signal with a lorentzian lineshape in the paramagnetic regime is observed 本论文边过选择磁性离子替代，着眼点在于讨论衫杂离子的磁性效应，实验发现掺杂使样品的磁结构发生变化，且在低温时出现磁化强度峰，用掺杂离子自旋旋转对此进行了解释。
Magnetic fluid shows higher saturation when it is exposed to magnetic field . in this paper , magnetic fluid is used to improve the dynamic performance of jet pipe servo valve by filling magnetic fluid in the working clearances of torque motor between armature and core 本文利用磁流体在外加磁场作用下,具有较大磁化强度的特点,提出了在力矩马达衔铁和铁芯的工作气隙中加入磁流体,利用磁流体来改善射流管伺服阀动态性能的方法。
In the four chapter , as in the second chapter which based on the single - spin transition dynamics , we study the evolution of the system magnetization in the three - dimensional xy model , which is subject to a time - dependent oscillating external field , and analyze its stationary states 第四章同样在单自旋跃迁临界动力学基础上，研究了三维各向同性( r = 1 )晶格上的xy模型在受到随时间振荡的外场情况下，平均磁化强度的时间演化，分析了达到稳定后磁化强度(
