This paper shows the investigation on the magnetic properties of the single crystal ergag under high magnetic field by quantum theory , and gains the magnetic anisotropy . it is in good agreement with the result of the experiment . using quantum theory , taking the special microscopic structure of ergag into account , we calculate and analyse the splitting of the lowest level ( 4i15 / 2 ) according to the crystal field 本文作者经过详细推导和计算第一次用量子理论定量计算了磁场作用下单晶ergag石榴石的磁特性，得出了在外磁场下ergag石榴石在温度4 . 2k时产生的与实验基本吻合的磁性各向异性现象，利用量子理论，鉴于ergag的特定的微观结构，计算基态( 4 ~ i _ ( 15 / 2 ) )能级在晶场作用下的劈裂，得出由于ergag的顺磁性，故其晶场作用下晶体的总磁矩应该为零。
There exists magnetoelectric effects in two type of material , one of them is spin - order material called magnetoelectrics that may exhibits an induced linear magnetoelectric effect by external field . this effect is named as the electrically induced magnetoelectric effect ( me ) e or magnetically induced magnetoelectric effect ( me ) h a ferroelectromagnet , however , differs from the magnetoelectrics in that it shows spontaneous magnetoelectric effects in addition to the ( me ) e , h effects induced by external fields 磁电效应主要存在于两类物质中，一类是自旋-轨道有序的物质所表现出的外场(磁场或电场)诱导的线性磁电效应( me ) _ ( h ， e ) ，又被称为磁场感生的电矩效应或电场感生的磁矩效应。
Abstract : the magnetic moment of a hydrogen atom is calculated by using the solution of the relativistic wave equations . it is shown that the so called total magnetic moment are produced from the electron orbit motion . these results show that the total angular momentum j is actually the relativistic orbital angular momentum 文摘:利用氢原子的相对论性波动方程解计算了氢原子的磁矩.结果表明，现行量子理论中所谓的总磁矩实际上都是由电子的轨道运动产生的，由此提出了所谓的总角动量实际上是相对论性轨道角动量的看法
The minimum of resistivity at low temperature range can be explained by magnetic scattering which corresponds to the peak of magnetization . all of the experimental data can be well explained on the basis of vrh model , which comes from not the clusters , but the inhomogenous magnetic background . based on the mechanism of transport , cmr effect is elucidated 体系磁性和电性的影响，通过实验分析得出了下列结论： q ） dy对la的替代产生了无规的磁势，破坏了mn o mn长程铁磁序，导致在tn丁tc温区出现团簇玻璃态，在t tn温区，由于dy子大的磁矩， la （ dy亚晶格和mn亚晶格磁矩强烈的耦合，体系呈现反铁磁态
Through the analysis of the dynamic characteristic of geomagnetic intensity in a orbit , the magnetic dipoles produced by magnetorquer are expanded in fourier series . the new method of momentum unloading is educed according to the need of the sum of unloaded momentum , and the magnetic dipoles are figured out under the theory of optimal control 通过对在轨卫星地磁场强度的变化规律分析，将卫星磁力矩器产生的磁矩按富利哀级数展开，根据卫星所需卸载角动量大小，按照最优控制理论求出三轴磁矩取值，得到一种新的利用地磁场给飞轮卸载的方法。
Zny , ni ( 1 - y ) fe2o4 and cobalt substituted ni - zn soft ferrite powders of zn0 . 4ni ( 0 . 6 - a ) coa fe2o4 are synthesized by shs . the shs powders and cycle samples are annealing in 1100 for 2h . their magnetic , and micro structural properties are studied using xrd , vsm and sem techniques . the studies reveal that the value of hc mr and ms of the powder of zn yni ( 1 - y ) fe2o4 are maximal when the value of y is 0 . 4 研究发现：随着zno含量( y值)的增加，粉末产物的矫顽力( hc ) 、饱和磁矩( ms )以及剩余磁矩( mr )先增大(在y = 0 . 4时取得最大值)然后再下降；磁环表面颗粒逐渐长大，孔隙率减少，密度增加；磁环的bs与br先增大再减小，在y = 0 . 4时达到最大；磁环的矫顽力hc是递减的。
