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由实验测得的磁滞回线数据的是一系列离散、带噪声的值。通过约束最小二乘方法对曲线进行分段拟合,使曲线的畸变程度得到了改善,准确地表达磁滞回线的特性,为磁材料的定量分析述提供了基础。 相似文献
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The magnetic susceptibility of ternary metal Prussian blue analogues with orthorhombic structure is studied using Ising model. Within the frame work of effective-field theory with correlations, the roles of the mole fraction y, uniaxial magnetic anisotropy, transverse and longitudinal magnetic field are discussed in details. The temperature dependence of the magnetic susceptibility is also investigated. The interesting phenomenon of the inverted magnetic hysteresis loop has been found. The results can help to understand the experimental work of the molecule-based ferriferrimagnet. 相似文献
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The magnetic susceptibility of ternary metal Prussian blue analogues with orthorhombic structure is studied using Ising model. Within the frame work of effective-field theory with correlations, the roles of the mole fraction y, uniaxial magnetic anisotropy, transverse and longitudinal magnetic field are discussed in details. The temperature dependence of the magnetic susceptibility is also investigated. The interesting phenomenon of the inverted magnetic hysteresis loop has been found. The results can help to understand the experimental work of the molecule-based ferri-ferrimagnet. 相似文献
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WUYin-Zhong LIZhen-Ya 《理论物理通讯》2002,37(2):243-246
Zero-temperature Monte Carlo simulations are used to investigate the hysteresis of a magnetic particle in a dipolar Ising model.The magnetic particle is described in a systemm of permanent dipoles,and the dipoles are located in a cubic lattice site.The effects of the shape and the size of the particle on the hysteresis loop at zero temperature are obtained.For strong exchange interactions,the shapes of magnetic hysteresis loops approach rectangle.For weak exchange interactions,the effects of the size and the shape of the particle on the loops are more remarkable than those of strong exchange interactions case.The slope of the hysteresis loop decreases with the increase of the ratio of the semi major axis to the semi minor axis of the ellipsoidal magnetic particle,and there is an increase of the slope of the hysteresis with the decrease of the size of the magnetic particle.The effects of the shape and size of the particle on the coercive force at zero temperature are also investigated. 相似文献
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The temperature dependence of minor hysteresis loops of compressively deformed nickel single crystals has been investigated in a wide temperature range below the Curie temperature of 628 K. There exist power-law relations between the field-dependent parameters of minor-loops, and their exponents are independent of both temperature and strain after the compressive deformation. These observations indicate the presence of universal power laws in minor hysteresis loops. The minor-loop coefficients of the power laws show a similar temperature dependence of the coercive force, which is quantitatively related to the dislocation density. These properties of minor hysteresis loops are useful for the accurate and quantitative nondestructive evaluation of age degradation in ferromagnetic materials. 相似文献
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利用Matlab简洁的语句表达方式和强大的绘图能力,实现示波器扫描方式、同步问题和李萨如图形的演示.该研究不但可以帮助学生加深对示波器工作原理理解,同时也可以提高示波器实验教学效果. 相似文献
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磁开关是磁脉冲压缩系统的关键部分,磁开关的磁芯性能参数直接影响到磁脉冲压缩系统的总体性能。针对磁脉冲压缩系统中磁开关磁芯应用特性,设计了回路振荡法对磁芯动态磁特性进行测量。通过测量磁开关工作电压和电流参数,计算磁芯的动态磁滞回线,确定饱和磁感应强度、矫顽力等动态参数。基于实验测量参数建立了包含动态磁滞回线的磁脉冲压缩电路模型,研究了磁开关动态特性对电压传递的影响。根据研究结果可得,在磁脉冲压缩系统设计中选择矫顽力较小的磁芯,可降低磁开关的能量损耗,从而保证系统具有较高的电压传递效率。 相似文献