Abstract: This invention is directed to an extrusion-molded magnet comprising a samarium-iron-nitrogen material, which is novel and capable of exhibiting excellent magnetic properties, i.e., samarium-iron-nitrogen system magnetic particles excellent in magnetic properties. A permanent magnet material comprising a samarium-iron-nitrogen system magnetized anisotropy particles and having increased inter-iron atom distance and elevated magnetic saturation. The magnet material is prepared by a method of causing nitrogen intrusion into the iron crystal lattice of a samarium-iron alloy by holding the alloy in a nitrogen gas at about 500 degrees C. The prepared permanent magnet material is added to a thermoplastic polyolefin system synthetic resin, and the admixture is thermally fused and kneaded. The paste thus obtained is charged into an extrusion molder and extruded through a magnetic field device, which is at an end of the extrusion molder and has an internal die, thus obtaining a molded magnet.

Abstract: A magnet sheet 3 with a thickness of 0.05 to 0.15 mm is formed by molding a material obtained by adding magnetic particles to a synthetic resin material into a sheet and multiple pole magnetizing one surface of the sheet to form alternate N and S poles on that surface. A printing sheet 2 with a thickness of 0.05 to 0.15 mm, constituted by a paper sheet such as a high quality paper sheet or a coated paper sheet or a synthetic paper sheet or a synthetic resin film, is bonded to the non-magnetized surface of the magnet sheet 3. A magnet display sheet 1 , which has a thickness of 0.1 mm to 0.3 mm, is thus obtained, and it is capable of being printing on with a usual home or office copier or printer.

Abstract: A non-magnetic case 3 made of acrylic acid or like synthetic resin has a case body 3a, a lid 3b and a right hexahedron shape. The case body 3a has a substantially spherical accommodation space 3c in which a spherical magnet body 2 having paired N and S poles arranged in a uni-axial direction is sealed together with oil or a like transparent liquid having a high specific gravity and also having a considerably high viscosity to provide buoyancy to the magnet body 2 and facilitate the rotation thereof with a lubricating action. The clearance between the magnet body 2 and the wall surface of the accommodation space 3c is set to be small such that the magnet body 2 can be rotated smoothly. The case 3 with the magnet body 2 therein is applicable to combination toys such as toy blocks and puzzle sets or various attracting articles having mutual attraction requirement. The thickness of a central portion of each side wall of the case is reduced to facilitate the attraction of the magnet bodies to each other.