A personal computer based semi-analytical micromagnetics design tool i
s described, The program enables the flexible modeling of systems of i
nteracting single-domain rectangular prisms. The program utilizes a co
nvenient graphical windowing interface that facilitates the design and
analysis of the system. Magnetization and magnetoresistive curve prop
erties of the system are calculated by the program, A design example o
f the magnetoresistive responses of spin valves with partially overlap
ping magnetic layers is presented.