What are the electrical methods of magnetism and demagnetisation materials

You have the question wrongly worded. I think what you mean is.

What is the electrical method for magnetising a material?
What is the electrical method for demagnetising a material?

You should also indicate what level you are, what your background knowledge is and why you need to know. All of these will improve the answers you get. But without these it is unlikely you will get the information you need.

The links should be useful.

Question doesn't make sense, sorry. You need to explain better what you want.