Magnetic Materials
Magnetic Materials
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DOI:
10.3403/00531122
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发表时间:
2018-08
期刊:
影响因子:
--
通讯作者:
R. Harris;A. Williams;I. Harris
中科院分区:
文献类型:
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作者:
R. Harris;A. Williams;I. Harris
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: