A Java program has been written as a practical tool for determining the maximum energy product of magnetic thin films. The program speeds up the process of the maximum energy product determination and can be used to display the hysteresis data in M-H, B-H and B-BH graphs. Effective demagnetizing factor (N_eff) can be evaluated from experimental hysteresis data by using this program. For discrete hysteresis data, a monotonic cubic interpolation algorithm is used to smooth the curves in order to find the maximum. Demagnetizing factor calculator for regular geometric shapes and a unit converter between CGS and SI are built in. The program can be used as a teaching aid and a research tool.

Figure 1. Graphical user interface of the HYLOOP, together with a hysteresis loop measured from a ferromagnetic FePt thin film.

Figure 2. Tools integrated in the HYLOOP (a) for calculation of the demagnetization factor for magnetic rectangular prism and (b) for unit converter from SI to Gaussian, vice versa.

Figure 3. Example of using HYLOOP, (a) M-H and (b) B-H hysteresis loops and (c) BH-H curve of a ferromagnetic FePt thin film, the original experimental data is shown in figure 1.