what is the best email type to request for Phd position
Answer the 5 W's: Who, What, Where, When, and Why.

Honestly my thought is skip the full introduction in the email. Instead, state that you are a phd student, and you believe the position fit in with your cv and you wish to have a in person meeting/or phone meeting to discuss this. Keep the email short and sweet. Once you meet the professor, discuss with him.