A composite soft magnetic material having low magnetostriction and high magnetic flux density contains: pure iron-based composite soft magnetic powder particles that are subjected to an insulating treatment by a Mg-containing insulating film or a phosphate film; and Fe—Si alloy powder particles including 11%-16% by mass of Si. A ratio of an amount of the Fe—Si alloy powder particles to a total amount is in a range of 10%-60% by mass. A method for producing the composite soft magnetic material comprises the steps of: mixing a pure iron-based composite soft magnetic powder, and the Fe—Si alloy powder in such a manner that a ratio of the Fe—Si alloy powder to a total amount is in a range of 10%-60%; subjecting a resultant mixture to compression molding; and subjecting a resultant molded body to a baking treatment in a non-oxidizing atmosphere.

Provided is a Fe—Co-based alloy sputtering target material having a composition represented as an atomic ratio by the compositional formula: (Fe.sub.a—Co.sub.100-a).sub.100-b-c-d—Ta.sub.b—Nb.sub.c-M.sub.d, wherein 0<a≦80, 0≦b≦10, 0≦c≦15, 5≦b+c≦15, 2≦d≦20, 15≦b+c+d≦25, and M represents one or more elements selected from the group consisting of Mo, Cr and W, with the balance consisting of unavoidable impurities, wherein the sputtering target material has a bending fracture strain ε.sub.fB at 300° C. of 0.4% or more.

The present invention provides an R-T-B based permanent magnet, comprising: a main phase which is composed of the structure of R.sub.2T.sub.14B (R is at least one element selected from Y, La, Ce, Pr, Nd, Sm, Eu and Gd, and T is one or more transition metal elements having Fe or a combination of Fe and Co as necessary); and a grain boundary phase which is composed of Ce.sub.xM.sub.1-x (M is at least one element selected from Mg, Al, Si, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Y, Zr, Nb, Mo, Ag, In, Sn, La, Pr, Nd, Sm, Eu, Gd, Hf, Ta, W and Bi, and x is within the range of 0.20≦x≦0.55), and the cross-sectional ratio Atre of the grain boundary phase to the whole magnet structure is within the range of 0.03<Atre<0.07.

Provided is soft magnetic powder used to manufacture a dust core having good mechanical strength and superior formability while iron loss is reduced. The soft magnetic powder for dust cores according to the invention is soft magnetic mixed powder that includes pure iron powder and soft magnetic iron-base alloy powder, wherein the proportion of the soft magnetic iron-base alloy powder in the mixture is 5 to 60 mass %, the ratio of the modes of the particle size distributions of the soft magnetic iron-base alloy powder and the pure iron powder ((the mode of the particle size distribution of the soft magnetic iron-base alloy powder)/(the mode of the particle size distribution of the pure iron powder)) is 0.9 or more and less than 5, and the ratio R.sub.over/R.sub.under is 1.2 or more, where R.sub.over is the mass proportion of soft magnetic iron-base alloy powder in mixed powder with a particle size of D50 or more based on the mass fraction, and R.sub.under is the mass proportion of soft magnetic iron-base alloy powder in mixed powder with a particle size of less than D50 based on the mass fraction.

Provided is soft magnetic powder used to manufacture a dust core having good mechanical strength and superior formability while iron loss is reduced. The soft magnetic powder for dust cores according to the invention is soft magnetic mixed powder that includes pure iron powder and soft magnetic iron-base alloy powder, wherein the proportion of the soft magnetic iron-base alloy powder in the mixture is 5 to 60 mass %, the ratio of the modes of the particle size distributions of the soft magnetic iron-base alloy powder and the pure iron powder ((the mode of the particle size distribution of the soft magnetic iron-base alloy powder)/(the mode of the particle size distribution of the pure iron powder)) is 0.9 or more and less than 5, and the ratio R.sub.over/R.sub.under is 1.2 or more, where R.sub.over is the mass proportion of soft magnetic iron-base alloy powder in mixed powder with a particle size of D50 or more based on the mass fraction, and R.sub.under is the mass proportion of soft magnetic iron-base alloy powder in mixed powder with a particle size of less than D50 based on the mass fraction.

Nanocomposite magnetic materials, methods of manufacturing nanocomposite magnetic materials, and magnetic devices and systems using these nanocomposite magnetic materials are described. A nanocomposite magnetic material can be formed using an electro-infiltration process where nanomaterials (synthesized with tailored size, shape, magnetic properties, and surface chemistries) are infiltrated by electroplated magnetic metals after consolidating the nanomaterials into porous microstructures on planar substrates. The nanomaterials may be considered the inclusion phase, and the magnetic metals may be considered the matrix phase of the multi-phase nanocomposite.

There is provided a compression-bonded magnet with a case, which can realize high magnetic properties, high corrosion resistance and high durability strength even at low cost. The compression-bonded magnet with a case is a compression-bonded magnet with a case 1, comprising: a compression-bonded magnet 2 comprising a rare earth magnet powder such as an isotropic Nd—Fe—B magnet powder and a resin binder of a thermosetting resin; a case 3 for inserting the compression-bonded magnet 2; and a sealing member 4, wherein the compression-bonded magnet 2 is formed by compression-molding a mixture comprising the rare earth magnet powder and the resin binder into a green compact and curing the resin binder contained in the green compact, the rare earth magnet powder is contained in a large amount with respect to the entire compression-bonded magnet (for example, in a volume ratio of 85% to 90%), the sealing member 4 is fixed at an insertion opening part 3a of the case 3, and the compression-bonded magnet 2 is hermetically sealed by the sealing member 4 and the case 3.

There is provided a compression-bonded magnet with a case, which can realize high magnetic properties, high corrosion resistance and high durability strength even at low cost. The compression-bonded magnet with a case is a compression-bonded magnet with a case 1, comprising: a compression-bonded magnet 2 comprising a rare earth magnet powder such as an isotropic Nd—Fe—B magnet powder and a resin binder of a thermosetting resin; a case 3 for inserting the compression-bonded magnet 2; and a sealing member 4, wherein the compression-bonded magnet 2 is formed by compression-molding a mixture comprising the rare earth magnet powder and the resin binder into a green compact and curing the resin binder contained in the green compact, the rare earth magnet powder is contained in a large amount with respect to the entire compression-bonded magnet (for example, in a volume ratio of 85% to 90%), the sealing member 4 is fixed at an insertion opening part 3a of the case 3, and the compression-bonded magnet 2 is hermetically sealed by the sealing member 4 and the case 3.

A sintered pulley may include a body of a metal alloy and configured with a substantially annular shape. The body may include a first face of contact with a crankshaft, a second face of contact with a securing element, and a concentric hole for associating the pulley with the crankshaft. The second face of contact may have a region of a point of contact with the securing element disposed proximate to the hole. The region of the point of contact may have a density of between 7.3 and 7.5 g/cm.sup.3.

An objective of the present invention is to provide a mixed powder for powder metallurgy that makes it possible to improve mold-filling ability and reduce spread in weight of molded bodies. The mixed powder for powder metallurgy according to the present invention is obtained by mixing a graphite powder with an average particle diameter D50 of 1.0 μm or more to 3.0 μm or less and D90 of 10 μm or less, without adding a binder, with an iron-based powder, while applying a sheer force. The thus obtained mixed powder for powder metallurgy according to the present invention is characterized by including the iron-based powder and the graphite powder present so as to be collected in concave portions of the iron-based powder.