They managed to produce such a layered material by pressing several powders with different Curie temperatures on top of each other with a subsequent sintering and diffusion treatment [60]. In this manner gradients of the Curie temperature between 0.3 and 10 Kmm−1 were obtained. The general idea is to make such a material in which the Curie temperature gradient would linearly and continuously change along the length (Fig. 2.2b).