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DOI: 10.1002/adma. 201405757 of magnetic nanoparticles in situ within hydrogel matrices has been proposed to obtain a homogeneously hybridized material.[5] However, in these previous reports, the magnetic nanoparticles were all randomly distributed inside the hydrogel without order. Additionally, the major efforts were made to the characterization of magnetic and mechanical property, seldom ranging over the control of magnetothermal performance. However, the control of magnetothermal performance is actually a very important issue clinically. For the homogeneous magnetic hydrogels, the magnetothermal behavior can only be modulated by the frequency of alternating magnetic field after the hydrogel materials are implanted into body. This is because the magnetothermal effect of magnetic nanoparticles actually just costs a very little energy of the alternating magnetic field. Thus, the machine to generate …