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Permanent magnet manufacturers will place the magnets in a high-temperature oven to apply cyclic temperature loading during the magnet design process, to observe the demagnetization state of the magnets. The heating process is usually so slow that the temperature distribution inside the magnet can be considered uniform. As a demonstration case, this case simulates the demagnetization state caused by the temperature rise in this process, and can serve as a quickly reference case for relevant users to learn. If the influence of temperature non-uniformity is considered in subsequent work, solid heat transfer can be easily added to this case. The modeling idea in the model and the BH curve data are available from the case : https://cww.comsol.com/models/modelinfo/?id=139621