What is Magnetization Current Density?

[Repetit]

Can someone explain to me what the magnetization current density (given by the curl of the magnetization M) and surface magnetization current density (given by the vector product between M and a surface normal vector) are? I have a book on electromagnetism but it doesn't really give a good exlanation to this.

Thanks in advance!

 

[quasar987]

Take Griffiths 'Introduction to electrodynamics' 3rd edition out of the bookshelf at your library and read pp.266-268.