Taiyo Yuden Co., Ltd.

Shinsuke Takeoka

Kenji Otake

Yoko Orimo

Takayuki Arai

Akiko Yamaguchi

Xinyu Li

Kazuhiko Oyama

Ryuichi Kondou

Kinshiro Takadate

Hirotaro Seino

Kazuki Misawa

Takashi Nakajima

Hitoshi Matsuura

Minoru Ryu

Yoshiki Iwazaki

Naoya Terauchi

Masanori Nagano

Natsuko Sato

Kazumi Kaneda

Kenji Takashima

Shunta Ishiwata

Chengli He

A magnetic body is constituted by grains of a soft magnetic alloy bonded together via an oxide layer, wherein: the soft magnetic alloy is an alloy containing Si by 1 to 5.5 percent by mass, and Cr and/or Al by 0.2 to 4 percent by mass in total, as constituent elements, with Fe and unavoidable impurities accounting for the remainder, wherein a content of Si is more than a content of Cr and Al in total; and the oxide layer contains Si, as well as at least one of Fe, Cr, and Al, where, among Fe, Si, Cr, and Al, Si is contained in the largest quantity based on mass. The magnetic body can have high magnetic permeability.

Coil component using magnetic body and circuit board carrying same

A magnetic base body according to an embodiment of the present invention includes a metal magnetic particle and an amorphous silicon oxide film provided on a surface of the metal magnetic particle, the amorphous silicon oxide film having a structural defect introduced therein.

Magnetic base body containing metal magnetic particles and electronic component including the same

A magnetic body is constituted by grains of a soft magnetic alloy bonded together via an oxide layer, wherein: the soft magnetic alloy is an alloy containing Si by 1 to 5.5 percent by mass, and Cr or Al by 0.2 to 4 percent by mass in total, as constituent elements, with Fe and unavoidable impurities accounting for the remainder; and the oxide layer contains Si, as well as at least one of Cr and Al, where, among Fe, Si, Cr, and Al, Si is contained in the largest quantity based on mass. The magnetic body can have high magnetic permeability.

Magnetic body and method for manufacturing same, as well as coil component using magnetic body and circuit board carrying same

A magnetic material includes a soft magnetic metal grain containing Fe, and a multilayer oxide film covering the surfaces of the soft magnetic metal grain. The multilayer oxide film has a first oxide layer of crystalline nature containing Fe, and a second oxide layer of amorphous nature containing Si. In an embodiment, the silicon oxide film of amorphous nature is formed by dripping, divided into multiple sessions, a treatment solution containing TEOS (tetraethoxy silane), ethanol, and water into a mixed solution containing the soft magnetic metal grain, ethanol, and ammonia water, to mix the solutions.

Magnetic material, electronic component, and method for manufacturing magnetic material

A magnetic base body relating to one embodiment of the present invention includes a main body and an oxide film formed on the surface of the main body. The main body includes an oxide phase containing Si and a plurality of metal magnetic particles bound via the oxide phase. In the metal magnetic particles, Fe accounts for 98.5 wt % or more. When an XRD diffraction pattern of the magnetic base body is observed, a ratio Ia/Ib is 10 or more where Ia denotes an integrated intensity of peaks derived from the (220) plane of FeOand Ib denotes an integrated intensity of peaks derived from the (104) plane of FeO.

Magnetic base body containing metal magnetic particles composed mainly of Fe and electronic component including the same

A method for manufacturing a coil component includes: providing multiple metal magnetic grains; preparing a magnetic body paste by mixing the multiple metal magnetic grains, a binder resin containing a resinate having at least one element selected from the group consisting of Si, Al, Cr, Mg, Ti, and Zr, and a solvent; forming a compact using the magnetic body paste; heat-treating the compact to form, on surfaces of the metal magnetic grains, bonding parts constituted by an amorphous oxide containing carbon and the at least one element, thereby forming a magnetic base body wherein the multiple metal magnetic grains are bonded via the bonding parts; forming a coil that includes a metal conductor; and forming external electrodes on surfaces of the magnetic base body and connecting end parts of the coil to the external electrodes, respectively.

Method for manufacturing coil component with magnetic base body formed using metal magnetic grains and resinate

An inductor includes a magnetic base body including soft magnetic metal particles containing iron, first and second external electrodes provided on the magnetic base body, and an internal conductor provided in the magnetic base body, with one end thereof electrically connected to the first external electrode and the other end thereof electrically connected to the second external electrode, the internal conductor extending linearly from the first external electrode to the second external electrode in plan view. The magnetic base body is configured so that a peak intensity ratio is 2 or more between a peak intensity of a first peak and a peak intensity of a second peak in a Raman spectrum obtained by using an excitation laser with a wavelength of 488 nm. The first peak is around a wave number of 712 cm, and the second peak is around a wave number of 1320 cm.

Inductor

A soft magnetic alloy powder contains Fe, Si, and at least one of Cr and Al, as constituent elements, wherein, on the surface of each grain constituting the alloy powder, an oxide film is provided which is such that: it contains Si, as well as at least one of Cr and Al, as constituent elements; these elements are contained at higher percentages by mass than those in the alloy part inside the grain; and the content of Si, expressed in percentage by mass, is higher than the total content of Cr and Al. The soft magnetic metal powder can achieve a higher filling rate.

Soft magnetic alloy powder and method for manufacturing same, as well as coil component made from soft magnetic alloy powder and circuit board carrying same

A magnetic base body comprises multiple metal magnetic grains and bonding parts for bonding the multiple metal magnetic grains, wherein the bonding parts are constituted by an amorphous mixture containing carbon and an oxide of at least one element selected from silicon, aluminum, chromium, magnesium, titanium, and zirconium. A coil component using the magnetic base body can improve mechanical strength while ensuring insulation reliability.

Magnetic base body, coil component, and electronic device

In an exemplary embodiment, a coil component includes: an element body partthat contains magnetic metal grains and nonmagnetic materials and has insulation property; and a coilembedded in the element body partand formed by a winding conductor. The element body parthas a main partand a low magnetic permeability partwhose relative permeability is lower than that of the main part; the coilhas a first surfaceand a second surfacerespectively representing surfaces positioned on opposite sides in the direction of the coil axis and intersecting the coil axis; and the low magnetic permeability partis provided between a first planeflush with the first surface, and a second planeflush with the second surface, in a manner away from the first planeand the second plane

Coil component and electronic device

A coil component that can be made thinner while ensuring sufficient magnetic characteristics includes a magnetic part, a conductor part, and multiple insulator parts. The magnetic part is constituted by magnetic alloy grains. The conductor part has multiple winding parts and is wound around one axis inside the magnetic part. The multiple insulator parts are each placed between the multiple winding parts, each having a winding shape that includes two joining surfaces that are respectively joined to two winding parts facing each other at least partially in the direction of the one axis, and are each constituted by electrically insulating grains.

Coil component and method for manufacturing the same

A coil component has a magnetic body of rectangular solid shape, a coil with N turns (N is a positive number of 2 or greater) provided inside the magnetic body, an insulating intermediate part, and external electrodes. The coil has a first conductor layer, a second conductor layer, and an inter-layer connection part. The first conductor layer has a first multiple winding part which is wound around one axis with a first spacing. The second conductor layer has a second multiple winding part which is wound around the one axis with the first spacing and faces the first conductor layer. The insulating intermediate part is provided inside the magnetic body and forms, between the first conductor layer and second conductor layer, a second spacing corresponding to a thickness equal to or less than the product of the first spacing and (N&#x2212;1).

Coil component

A magnetic material has: multiple soft magnetic alloy grains that contain Fe, element L (where element L is Si, Zr, or Ti), and element M (where element M is not Si, Zr, or Ti, and oxidizes more easily than Fe); a first oxide film that contains element L and covers each of the multiple soft magnetic alloy grains; a second oxide film that contains element M and covers the first oxide film; a third oxide film that contains element L and covers the second oxide film; a fourth oxide film that contains Fe and covers the third oxide film; and bonds that are constituted by parts of the fourth oxide film and that bond the multiple soft magnetic alloy grains together.

Magnetic material and electronic component

In an embodiment, a coil component includes a magnetic body, and an internal conductorhaving a center axis and formed in a spiral shape; wherein the internal conductoris embedded in the magnetic body; in a cross sectional view of a plane that includes the center axis extending in the vertical direction, wherein a conductor region partpositioned between the adjacent windings of the spiral shape has a higher oxygen content than that of a core partincluding the center axis and positioned on the inner side of the windings of the spiral shape. the magnetic body is constituted by iron-based soft magnetic grains and oxide film of at least one type of element that oxidizes more easily than iron, which oxide film bonds at least partly the iron-based soft magnetic grains.

In an embodiment, a magnetic body includes soft magnetic alloy grainscontaining Fe, element L, and element M (where element L is Si or Zr and element M is a metal element other than Si or Zr that oxidizes more easily than Fe), as well as oxide film produced from oxidization of part of these grains; wherein at least some of the bonds between adjacent soft magnetic alloy grainsare by way of the oxide film; the oxide film has an inner film, and an outer filmpositioned on the outer side of the inner film; and the inner filmcontains more of element L than element M, while the outer filmcontains more of element M than element L.

Growing community of inventors

Takasaki, Japan

Shinsuke Takeoka