Provided is an amorphous alloy soft magnetic powder having a composition represented by the following formula: (Fe.sub.xCo.sub.(1?x)).sub.(100?(a+b))(Si.sub.yB.sub.(1?y)) .sub.aM.sub.b, [where M is at least one selected from the group consisting of C, S, P, Sn, Mo, Cu, and Nb, 0.73?x?0.85, 0.02 ?y?0.10, 13.0 ?a?19.0, and 0?b?2.0], in which a coercive force is 24 [A/m] or more (0.3 [Oe] or more) and 199 [A/m] or less (2.5 [Oe] or less), and a saturation magnetic flux density is 1.60 [T] or more and 2.20 [T] or less.

A method of manufacturing a pressed powder magnetic core disclosed herein may include: mixing soft magnetic metal particles, low-melting-point glass particles and lubricant and heating a mixture of the soft magnetic metal particles, the low-melting-point glass particles and the lubricant at a temperature that is higher than a melting point of the lubricant and is lower than a softening point of the low-melting-point glass particles so as to obtain powder of coated metal particles in which surfaces of the soft magnetic metal particles are coated by the lubricant and the low-melting-point glass particles are distributed in coating layers of the lubricant; filling a mold with the powder; press-molding the powder in the mold; and annealing the press-molded powder. In the pressed powder magnetic core, an amount of the low-melting-point glass particles may be 0.1 wt % to 5.0 wt % relative to an amount of the soft magnetic metal particles.

A magnetic field shielding unit according to one embodiment of the present disclosure comprises: a first shielding sheet having a first magnetic field shielding layer formed of fragments of an Fe-based alloy to enhance an antenna characteristic for wireless charging in order to enhance flexibility and reduce an eddy current; and a second shielding sheet having a second magnetic field shielding layer formed of fragments of ferrite to enhance an antenna characteristic for short range communication in order to enhance the flexibility of the shielding unit. According to the present disclosure, the shielding unit is complexly configured to enhance all of the characteristics of different types of antennas operating in different frequency bands so that the shielding unit can significantly enhance the transmission/reception distance and efficiency of a signal and can be implemented to be very slim; the flexibility of the shielding is enhanced, which makes it possible to prevent additional micro-cracks of a magnetic material and fragmentation thereof, thus preventing a magnetic material and fragmentation thereof, thus preventing a magnetic permeability decrease in the operating frequency band of an antenna in advance; and the shielding unit can adhere firmly to an object having a step so that it is possible to solve a problem of separation of th shielding unit.

Provided herein is a dust core having high mechanical strength and high magnetic permeability. An alloy powder constituting the dust core is also provided. A soft magnetic powder is used that has a plurality of protrusions of 0.1 m or more and 5 m or less on an alloy powder surface. A dust core is used that contains at least 80 weight % of the soft magnetic alloy powder. A method for producing a soft magnetic powder is used that includes producing an amorphous soft magnetic alloy ribbon by liquid quenching; and pulverizing the amorphous soft magnetic alloy ribbon into a powder having a thickness of 0.1 m or more and 40 m or less without heat treatment. The pulverization cleaves the amorphous soft magnetic alloy ribbon, and produces a protrusion on a powder surface.

Provided herein is a soft magnetic alloy powder that can exhibit a high saturation flux density and desirable soft magnetic characteristics. A dust core using such a soft magnetic alloy powder is also provided. A soft magnetic alloy powder is used that includes an amorphous phase, and an Fe crystalline phase residing in the amorphous phase. The Fe crystalline phase has a crystallite volume distribution with a mode of 1 nm or more and 15 nm or less, and with a half width of 3 nm or more and 50 nm or less.

A magnetic isolator includes a dielectric film having a layer of electrically-conductive soft magnetic material bonded thereto. The layer of electrically-conductive soft magnetic material comprises substantially coplanar electrically-conductive soft magnetic islands separated one from another by gaps. At least some of the electrically-conductive soft magnetic islands have an outer insulating oxidized layer that electrically insulates them from adjacent electrically-conductive soft magnetic islands. The gaps at least partially suppress electrical eddy current induced within the layer of soft magnetic material when in the presence of applied external magnetic field. An electronic device including the magnetic isolator and a method of making the magnetic isolator are also disclosed.

The present application relates to the technical field of electromagnetic-isolation shielding materials, and in particular to a heat-resistant nanocrystalline magnetic-isolation shielding material and a preparation method and application thereof. The preparation method includes the following steps: S1, applying a double-sided adhesive tape onto a nanocrystalline soft-magnetic alloy ribbon to prepare a adhesive-coated nanocrystalline ribbon; S2, performing primary magnet cracking treatment on the adhesive-coated nanocrystalline ribbon to obtain a single-layered nanocrystalline magnetic layer; S3, performing multi-layer combination on the single-layered nanocrystalline magnetic layer to obtain a composite, and performing stress relief treatment on the composite to obtain a multi-layered nanocrystalline magnetic layer; and S4: performing secondary magnet cracking treatment on the multi-layered nanocrystalline magnetic layer to obtain a heat-resistant nanocrystalline magnetic-isolation shielding material.

A magnetic field shielding unit according to one embodiment of the present disclosure comprises: a first shielding sheet having a first magnetic field shielding layer formed of fragments of an Fe-based alloy to enhance an antenna characteristic for wireless charging in order to enhance flexibility and reduce an eddy current; and a second shielding sheet having a second magnetic field shielding layer formed of fragments of ferrite to enhance an antenna characteristic for short range communication in order to enhance the flexibility of the shielding unit. According to the present disclosure, the shielding unit is complexly configured to enhance all of the characteristics of different types of antennas operating in different frequency bands so that the shielding unit can significantly enhance the transmission/reception distance and efficiency of a signal and can be implemented to be very slim; the flexibility of the shielding is enhanced, which makes it possible to prevent additional micro-cracks of a magnetic material and fragmentation thereof, thus preventing a magnetic material and fragmentation thereof, thus preventing a magnetic permeability decrease in the operating frequency band of an antenna in advance; and the shielding unit can adhere firmly to an object having a step so that it is possible to solve a problem of separation of th shielding unit.

The present invention provides a dust core including, as principal components, a pulverized powder of an Fe-based amorphous alloy ribbon; and a Cr-containing Fe-based amorphous alloy atomized spherical powder, and the pulverized powder is in the shape of a thin plate having two principal planes opposing each other, and assuming that a minimum dimension along a plane direction of the principal planes is a grain size, the pulverized powder includes a pulverized powder with a grain size more than twice and not more than six times as large as a thickness of the pulverized powder in a proportion of 80 mass % or more of the whole pulverized powder and includes a pulverized powder with a grain size not more than twice as large as the thickness of the pulverized powder in a portion of 20 mass % or less of the whole pulverized powder.

A device is provided with a potential noise radiating source capable of radiating potential noise, a potential noise receiving portion capable of receiving the potential noise and an electromagnetic interference suppression body. The electromagnetic interference suppression body is made by binding flaky soft magnetic metal powder with a binding component and has a sheet-like shape. The electromagnetic interference suppression body is formed with a plurality of slits. The electromagnetic interference suppression body is provided to straddle the potential noise radiating source and the potential noise receiving portion.