A reactor 1 of the present invention includes a coil 2 and a magnetic core 3 disposed inside and outside the coil 2 to form a closed magnetic path. At least part of the magnetic core 3 is made of a composite material containing a magnetic substance powder made of an identical material and a resin containing the powder being dispersed therein. In the particle size distribution of the magnetic substance powder, a plurality of peaks are present. That is, the magnetic substance powder contains both a fine powder and a coarse powder at high frequencies. Since the composite material contains the fine powder, it can reduce the eddy current loss, and hence achieves to be a low-loss material. Thanks to the mixed powder including the fine powder and the coarse powder, the packing density of the magnetic substance powder is increased. Thus, the composite material exhibits a high saturation magnetic flux density. By employing such a mixed powder, the raw material powder can be handled with ease, and excellent manufacturability of the composite material is obtained.

A reactor 1 of the present invention includes a coil 2 and a magnetic core 3 disposed inside and outside the coil 2 to form a closed magnetic path. At least part of the magnetic core 3 is made of a composite material containing a magnetic substance powder made of an identical material and a resin containing the powder being dispersed therein. In the particle size distribution of the magnetic substance powder, a plurality of peaks are present. That is, the magnetic substance powder contains both a fine powder and a coarse powder at high frequencies. Since the composite material contains the fine powder, it can reduce the eddy current loss, and hence achieves to be a low-loss material. Thanks to the mixed powder including the fine powder and the coarse powder, the packing density of the magnetic substance powder is increased. Thus, the composite material exhibits a high saturation magnetic flux density. By employing such a mixed powder, the raw material powder can be handled with ease, and excellent manufacturability of the composite material is obtained.

The present invention relates to an Ni—Zn—Cu—Co ferrite sintered plate having a composition comprising 45 to 50 mol % of Fe.sub.2O.sub.3, 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, and a ferrite sintered sheet that is provided on a surface thereof with a groove and further with an adhesive layer and/or a protective layer. The ferrite sintered sheet is capable of exhibiting an increased μ′ value of a magnetic permeability while maintaining a small μ″ value of the magnetic permeability.

The present invention relates to an Ni—Zn—Cu—Co ferrite sintered plate having a composition comprising 45 to 50 mol % of Fe.sub.2O.sub.3, 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, and a ferrite sintered sheet that is provided on a surface thereof with a groove and further with an adhesive layer and/or a protective layer. The ferrite sintered sheet is capable of exhibiting an increased μ′ value of a magnetic permeability while maintaining a small μ″ value of the magnetic permeability.

A process for liquefying a process gas that includes introducing a heat transfer fluid into an active magnetic regenerative refrigerator apparatus that comprises a single stage comprising dual multilayer regenerators located axially opposite to each other.

A method for forming a stabilized bed of magneto-caloric material is provided. The method includes aligning magneto-caloric particles within the casing while a magnetic field is applied to the magneto-caloric particles and then fixing positions of the magneto-caloric particles within the casing. A related stabilized bed of magneto-caloric material is also provided.

A grain oriented electrical steel sheet has a magnetic domain structure modified by strain introduction without a trace of treatment, in which noise generated when the grain oriented electrical steel sheet is used laminated on an iron core of a transformer is effectively reduced by: setting a magnetic flux density B.sub.8 to 1.92 T or higher; then setting a ratio of average magnetic domain width of treated surface after strain-introducing treatment W.sub.a to average magnetic domain width before strain-introducing treatment W.sub.0 as W.sub.a/W.sub.0<0.4; and setting a ratio of W.sub.a to average magnetic domain width of untreated surface W.sub.b as W.sub.a/W.sub.b>0.7; and further setting a ratio of average width of magnetic domain discontinuous portion W.sub.d in the untreated surface to average width of magnetic domain discontinuous portion in treated surface resulting from strain-introducing treatment W.sub.c as W.sub.d/W.sub.c>0.8; and setting W.sub.c<0.35 mm.

A grain oriented electrical steel sheet has a magnetic domain structure modified by strain introduction without a trace of treatment, in which noise generated when the grain oriented electrical steel sheet is used laminated on an iron core of a transformer is effectively reduced by: setting a magnetic flux density B.sub.8 to 1.92 T or higher; then setting a ratio of average magnetic domain width of treated surface after strain-introducing treatment W.sub.a to average magnetic domain width before strain-introducing treatment W.sub.0 as W.sub.a/W.sub.0<0.4; and setting a ratio of W.sub.a to average magnetic domain width of untreated surface W.sub.b as W.sub.a/W.sub.b>0.7; and further setting a ratio of average width of magnetic domain discontinuous portion W.sub.d in the untreated surface to average width of magnetic domain discontinuous portion in treated surface resulting from strain-introducing treatment W.sub.c as W.sub.d/W.sub.c>0.8; and setting W.sub.c<0.35 mm.

A method for synthesizing ferromagnetic manganese-bismuth (MnBi) nanoparticles, and the MnBi nanoparticles so synthesized, are provided. The method makes use of a novel reagent termed a manganese-based Anionic Element Reagent Complex (Mn-LAERC). A process for forming a bulk MnBi magnet from the synthesized MnBi nanoparticles is also provided. The process involves simultaneous application of elevated temperature and pressure to the nanoparticles.

A method for synthesizing ferromagnetic manganese-bismuth (MnBi) nanoparticles, and the MnBi nanoparticles so synthesized, are provided. The method makes use of a novel reagent termed a manganese-based Anionic Element Reagent Complex (Mn-LAERC). A process for forming a bulk MnBi magnet from the synthesized MnBi nanoparticles is also provided. The process involves simultaneous application of elevated temperature and pressure to the nanoparticles.