Stabilizing Domain Networks in Thin Film Heads
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Thin film recording heads are usually made of permalloy and have more than one equilibrium domain wall configuration. This article describes techniques for stabilizing the domain state in thin film heads so as to maintain the most efficient and least noisy configuration for the read/ write process, relying mostly on the domain rotation mechanism. One method to stabilize the domain wall network is to focus a laser beam and to raise the intensity so as to heat a local spot sufficiently to cause a domain pinning at that spot. The desired spot or spots to choose are the places having the greatest stabilizing influence. One choice would be near or at the juncture of a main l80- degree wall with closure walls.