Nowadays there are many methods to observe the magnetic domain structure, including powder-pattern method, magneto-optical effect method and electron holography method, etc.
目前,磁畴观测的方法已有很多种,如粉纹图法、磁光效应法、电子全息法等。
In this paper, the principles of thermo-magneto writing, the Kerr magneto-optical effect and how to read the information by this effect are introduced.