MAGNETIC CHARACTERIZATION OF THIN BUBBLE-FILMS

Standard procedures for evaluating magnetic bubble materials are found to yield sizeable (≳10%) errors in values of magnetic parameters even for thick (∼9.25 micrometer) films. Several alternative procedures are described which yield values of magnetic parameters to 1% accuracy for thick (≳3 micrometer) bubble films. Application of these new procedures to thin (<3 micrometer) bubble films decreases the accuracy somewhat, but magnetic parameters are consistent within about 2%. The new procedure is described and results are presented for a number of thin films for comparison to the results achieved by the standard procedure.