Murata Manufacturing Co., Ltd.

Mikito Sugiyama

Mitsuru Odahara

Takuya Ishida

Hideaki Ooi

Gota Shinohara

Noriko Shimizu

Isamu Miyake

Koichi Ida

Mari Yonemura

Takao Kawachi

Naoya Noo

A magnetic material is formed of an aggregate of magnetic particles. When a magnetic particle is rotated by 360/n degrees (n is an any integer equal to or greater than 6) around a gravity center position of the magnetic particle in a planar region, an area of the magnetic particle after the rotation overlaps with an area of the magnetic particle before the rotation by 90% or more. In the planar region, gravity center positions of from nine to eleven magnetic particles are on a band portion in a rectangular shape. For the magnetic particles in the planar region, when a number-based 50% cumulative frequency distribution of maximum lengths in a direction passing through respective gravity center positions is defined as α, a 10% cumulative frequency distribution is equal to or greater than 0.6α, and a 90% cumulative frequency distribution is equal to or less than 1.4α.

Magnetic material and inductor

A magnetic material includes magnetic particles. When a magnetic particle is rotated by 360/n degrees (n is an any integer equal to or greater than 2) around a gravity center position of the particle in a planar region, an area of the particle after the rotation overlaps with an area of the particle before the rotation by 90% or more. In the planar region, gravity center positions of from nine to eleven particles are present on a band portion in a rectangular shape. For the particles in the planar region, when a number-based 50% cumulative frequency distribution of maximum lengths in a direction passing through respective gravity center positions is defined as α, a 10% cumulative frequency distribution is equal to or greater than 0.9α, and a 90% cumulative frequency distribution is equal to or less than 1.1α. A surface of the particle is covered with an insulating film.

A magnetic composite contains metal magnetic particles and a resin. The metal magnetic particles contain at least one Fe-containing crystalline material, and [Formula 1]Bs×α×{log(γ×1/D+δ×Bs+ε)}{circumflex over ( )}β≥13T, where Bs and D are the saturation flux density in T and the median diameter of crystallites in μm, respectively, of the crystalline material, α=14.3, β=−0.67, γ=752, δ=512, and ε=−815.

Magnetic composite

A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter Dof 1.3 μm or more and 5.0 μm or less (i.e., from 1.3 μm to 5.0 μm), and second particles having a median diameter Dlarger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.

Composite magnetic material and inductor using the same

A coil component includes a body and a coil conductor embedded in the body. The body includes a magnetic layer and a non-magnetic layer. The magnetic layer is formed of a composite material including a metal particle and a resin material, and the non-magnetic layer is arranged not to extend through a winding portion of the coil conductor or not to entirely extend through the body.

Coil component

A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter Dof 1.3 &#x3bc;m or more and 5.0 &#x3bc;m or less (i.e., from 1.3 &#x3bc;m to 5.0 &#x3bc;m), and second particles having a median diameter Dlarger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.

A coil component includes a body and a coil conductor embedded in the body. The body includes a magnetic layer and a non-magnetic layer. The magnetic layer is formed of a composite material including a metal particle and a resin material, and the non-magnetic layer is arranged to block between at least one of top and bottom surfaces of the body and the coil conductor.

A coil component includes a body, a coil conductor embedded in the body, and outer electrodes disposed on the outside of the body. The body includes a first magnetic layer containing a substantially spherical metallic magnetic material and second and third layers containing a substantially flat metallic magnetic material. At least the wound section of the coil conductor is between the second and third magnetic layers in the direction along the axis of the coil conductor. In the direction perpendicular to the axis, the second and third magnetic layers have a width equal to or larger than the outer diameter of the wound section of the coil component. The substantially flat metallic magnetic material is oriented so that the flat plane thereof is perpendicular to the axis of the coil conductor. The first magnetic layer extends between the second and third magnetic layers and the outer electrodes.

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Nagaokakyo, Japan

Mikito Sugiyama