Ferromagnetic or Ferrimagnetic Layer, Method for the Production Thereof, and Use Thereof

摘要

A film and method of preparing a film. The film is made of at least one of ferromagnetic and ferrimagnetic material. An elongated slot is included in the material and is operable to control the domain structure of the material. The depth of the elongated slot is the same as the thickness of the film and the width of the elongated slot is greater than an exchange length of the material. The slot is free from contact with any side of the film.