An inductor device and a method of fabricating the same. The inductor device according to the invention includes a conductive coil, a pillar and a cladding body. The pillar is molded from a plurality of first composite material powders by a pressing process. Each first composite material powder is composed of a first magnetic material powder coated with a first thermosetting resin. The cladding body is molded from a plurality of second composite powders. Each second composite material powders is composed of a second magnetic material powder coated with a second thermosetting resin. The first weight ratio of the first thermosetting resin to the first composite material powders is less than the second weight ratio of the second thermosetting resin to the second composite material powders. The cladding body and the conductive coil and the pillar cladded by the cladding body are heated to a curing temperature.

A coupled inductor has two pillars that are aligned in a vertical direction, wherein a first coil and a second coil are respectively wound around one of the two pillars, respectively, wherein the bottom surface of winding turns of the first coil and the bottom surface of winding turns of the second coil are separated by a gap, wherein a magnetic material is disposed in the gap and a straight line that is enclosed by each of the first coil and the second coil passes through the two pillars.

An inductor has one or more wires and a multipart magnetic core. The multipart magnetic core has magnetic core parts that are adjacent and magnetically coupled. The inductor provides an inductance of at least 40 nH for currents greater than 1 A and less than 60 A, and at least 20 nH for currents of at least 60 A.

Disclosed is a basic module of a magnetic core of a wound electrical transformer. The basic module includes first and second windings placed atop one another and made of first and second materials, respectively. The first material is a crystal having a saturation magnetization ≧1.5 T and magnetic losses less than 20 W/kg in sine waves having a frequency of 400 Hz, for maximum induction of 1 T, and the second material is a material having an apparent saturation magnetostriction less than or equal to 5 ppm and magnetic losses less than 20 W/kg in sine waves having a frequency of 400 Hz, for maximum induction of 1 T. The cross-sections of the first winding and cross-sections of the second winding satisfy (S.sub.1/(S.sub.1+S.sub.3); S.sub.2/(S.sub.2+S.sub.4)) of the first material, having a high saturation magnetization, compared to the cross-section of both materials together, is 2%-50%.

An inductor component comprising a spiral wiring wound on a plane; a first magnetic layer and a second magnetic layer located at positions sandwiching the spiral wiring from both sides in a normal direction relative to the plane on which the spiral wiring is wound; a vertical wiring extending from the spiral wiring in the normal direction to pass through the first magnetic layer; and an external terminal disposed on a surface of the first magnetic layer to connect an end surface of the vertical wiring. The first magnetic layer has magnetic permeability lower than that of the second magnetic layer.

A coil component includes a support substrate, a coil portion disposed on at least one surface of the support substrate, a magnetic body, in which the support substrate and the coil portion are disposed, having a through-portion penetrating through a center of the coil portion, a nonmagnetic layer disposed below the through-portion, and an insulating layer disposed between the nonmagnetic layer and the through-portion.

A method for fabricating magnetic cores, wherein the magnetic cores have at least two materials with different magnetic properties. The materials are selected from a ferrite material, an oxide ceramic material and a superparamagnetic material and are formed alternately in individual regions along the magnetic core.

A method for manufacturing a magnetic flux concentrator structure comprises the steps of: providing a first stack comprising a plurality of laminated layers, each of said laminated layers being of a first soft ferromagnetic material; providing a second stack comprising a plurality of laminated layers, each of said laminated layers being of a second soft ferromagnetic material having a different magnetic hysteresis from said first soft ferromagnetic material; annealing separately said first and said second stack; assembling said annealed first stack and said annealed second stack to obtain said magnetic flux concentrator structure.

A coil component includes: a first substrate body and a second substrate body, both formed in a manner containing a magnetic material; an adhesive containing an organic material and a filler, for bonding the first substrate body and the second substrate body; a coil formed by a conductor having an insulating film; and electrodes connected electrically to the coil; wherein the surface roughness of the face of the first substrate body bonded to the second substrate body via the adhesive is higher than the average grain size of the filler.

Disclosed herein is a coil component that includes an element body made of a first magnetic material, a coil conductor embedded in the element body, and first and second magnetic films made of a second magnetic material having higher permeability than that of the first magnetic material. The element body has an upper surface crossing a coil axis of the coil conductor and first and second side surfaces extending substantially parallel to the coil axis. The first magnetic film is formed on the upper surface and first side surface of the element body, and the second magnetic film is formed on the upper surface and second side surface of the element body.