Amorphous alloy soft magnetic powder, compacted magnetic core, magnetic element, and electronic equipment

The amorphous alloy soft magnetic powder with a specific atomic ratio achieves both high permeability and low coercivity, addressing the limitations of existing powders by optimizing atomic arrangement and Fe-K absorption edge structure.

JP7882033B2Active Publication Date: 2026-06-30SEIKO EPSON CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SEIKO EPSON CORP
Filing Date
2022-07-26
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing soft magnetic alloy powders face challenges in achieving both high magnetic permeability and low coercive force, particularly when attempting to increase permeability, which often leads to insufficient reduction in coercive force.

Method used

The amorphous alloy soft magnetic powder is composed of a specific atomic ratio (Fe 1-x Cr x ) a (Si 1-y B y ) 100-a-b C b, with x, y, a, and b within defined ranges, exhibiting a unique Fe-K absorption edge XANES spectrum characteristics, ensuring high amorphousness and optimal atomic arrangement for both high permeability and low coercivity.

Benefits of technology

This composition allows for the production of magnetic elements with both high magnetic permeability and low coercivity, enabling miniaturization and increased power output.

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Abstract

To provide amorphous alloy soft magnetic powder having both high magnetic permeability and low coercive force, a powder magnetic core containing the amorphous alloy soft magnetic powder and a magnetic element, and an electronic device capable of achieving high output.SOLUTION: Amorphous alloy soft magnetic powder is constituted of particles having a composition with a compositional formula represented by ratios of the number of atoms (Fe1-xCrx)a(Si1-yBy)100-a-bCb [provided that x, y, a and b satisfy 0<x≤0.06, 0.3≤y≤0.7, 70.0≤a≤81.0 and 0<b≤3.0]. When performing XAFS measurement by setting an analytical depth to bulk, an obtained Fe-K absorption edge XANES spectrum has a first absorption end structure including a peak A present in a range of 7,113±1 eV and a first continuous band structure located on a higher energy side than the first absorption end structure. When an intensity of the first continuous band structure is set to be 1, an intensity of the peak A at 7,113 eV is 0.60 or more and 0.90 or less.SELECTED DRAWING: Figure 7
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