MEASUREMENT OF VECTOR MINOR LOOPS

An experimental vector analysis of the rotational magnetization, reman ent magnetization and reversible magnetization properties of longitudi nal recording samples is presented. It is found that for large fields the locus of the magnetization vector, the remanent magnetization vect or and the reversible magnetization are all ellipses whose aspect rati os are fundamentally different. For smaller rotating fields, the traje ctory of the magnetization vector and the remanent magnetization vecto r are spirals whose limit cycle is an ellipse; however, the reversible magnetization vector is an ellipse. These experimental results are in agreement with a recently proposed vector hysteresis model for record ing media.