Magnetic Materials

Magnetic Materials
复制标题

DOI:
10.3403/00531122
复制
发表时间:
2018-08
期刊:
Introduction to Electricity and Magnetism
影响因子:
--
通讯作者:
R. Harris;A. Williams;I. Harris
R. Harris;A. Williams;I. Harris
中科院分区:
其他
文献类型:
--
作者:
R. Harris;A. Williams;I. Harris

文献摘要

相似文献

接下来我们考虑磁场对材料的影响。我们预计,这种效应将类似于磁场--磁场将在材料中感应出磁偶极子。考虑到这一点,我们将磁化强度M定义为磁偶极矩/体积。这会产生什么影响?考虑一个面平行于xy,yz,xz平面,一个角在(x,y,z)的小立方体。首先考虑x + dx处的平面。那么在立方体中会有一个偶极矩:因此,这将意味着在-z方向上的电流为:现在考虑在x方向上的下一个立方体(在x + dx,y,z处的角)。它将在同一面产生一个电流,由下式给出:z y I M x dx,y,z dy因此,M的y分量将在z方向的面产生一个净电流:
We next consider the effect of magnetic fields on materials. We expect that the effect will be similar to that with dielectrics – the field will induce a magnetic dipole in the material. Anticipating this we define a magnetization M  as the magnetic dipole moment/volume. What will the effect of this be? Consider a tiny cube with faces parallel to the xy, yz, xz planes and one corner at (x,y,z). Consider first the plane at x + dx. Then there will be a dipole moment:   p M x,y,z dxdydz    in the cube. Hence   y y p M x,y,z dxdydz  This will mean a current in the –z direction of:   y z y p I M x ,y ,zd y dx dz   Now consider the next cube out in the x direction (corner at x + dx,y,z). It will produce a current at the same face given by:   z y I M x dx,y,z dy   Hence the y component of M  will produce a net current at the face in the z direction of: