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KR-20260066699-A - MAGNETIC PARTICLE AND MAGENTIC COMPONENT

KR20260066699AKR 20260066699 AKR20260066699 AKR 20260066699AKR-20260066699-A

Abstract

One embodiment of the present invention provides a magnetic particle comprising a plurality of phases, wherein the plurality of phases include an Fe-based phase and an Fe₃O₄ phase, and wherein, in a cross-section of the metal magnetic particle, the area occupied by the Fe₃O₄ phase among the plurality of phases is less than 50% of the total area of the plurality of phases.

Inventors

  • 전종옥
  • 홍효기
  • 임정호
  • 박일진
  • 유영석
  • 강인영

Assignees

  • 삼성전기주식회사

Dates

Publication Date
20260512
Application Date
20260504
Priority Date
20211228

Claims (20)

  1. It includes metallic magnetic particles having multiple phases, The above plurality of phases include an Fe-based phase and an Fe₃O₄ phase, and A magnetic particle in which, in the cross-section of the metal magnetic particle, the area occupied by the Fe₃O₄ phase among the plurality of phases is less than 50% of the total area of the plurality of phases.
  2. In paragraph 1, The above Fe-based phase is a magnetic particle containing a single-crystal region.
  3. In paragraph 2, The above Fe-based phase is a magnetic particle having a polycrystalline structure including a plurality of single-crystal regions.
  4. In paragraph 2, The above single crystal region is a magnetic particle comprising at least one of the group consisting of Fe(001) phase, Fe(011) phase, Fe(002) phase, Fe(101) phase, Fe(111) phase, and Fe(224) phase.
  5. In paragraph 1, The above Fe-based phase is a magnetic particle containing a metal including Fe, Si, and Cr.
  6. In paragraph 1, The above plurality of phases are magnetic particles further comprising an amorphous phase.
  7. In paragraph 6, The above amorphous phase is a magnetic particle comprising at least one of an Fe-based metal and an Fe-based metal oxide.
  8. In paragraph 1, The above Fe₃O₄ phase is a magnetic particle containing a single-crystal region.
  9. In paragraph 8, The above single crystal region is a magnetic particle comprising at least one of the group consisting of Fe₃O₄ ( 022 ) phase, Fe₃O₄ ( 113 ) phase, Fe₃O₄ ( 311 ) phase, and Fe₃O₄ ( 111 ) phase.
  10. In paragraph 1, A magnetic particle in which the area occupied by the Fe₃O₄ phase among the plurality of phases in the cross-section of the metal magnetic particle is 19%-42.3% of the total area of the plurality of phases.
  11. In paragraph 1, Magnetic particles in which the ratio of the Fe₃O₄ phase present on the surface of the above metal magnetic particles is less than 70%.
  12. In paragraph 1, At least a portion of the above Fe₃O₄ phase is a magnetic particle existing in the central part of the cross-section passing through the center of the metal magnetic particle.
  13. In paragraph 1, A magnetic particle further comprising an oxide film formed on the surface of the above-mentioned metal magnetic particle.
  14. In Paragraph 13, The above oxide film is a magnetic particle containing a crystalline region.
  15. In Paragraph 14, The above-mentioned crystal region is a magnetic particle containing Fe₃O₄ components .
  16. In paragraph 15, The Fe₃O₄ component of the above crystal region is a magnetic particle having an orientation structure different from the Fe₃O₄ phase .
  17. In paragraph 1, Magnetic particles with a diameter of 10–900 nm measured in a cross-section including the center.
  18. It includes metallic magnetic particles having multiple phases, The above plurality of phases include an Fe-based phase and an Fe₃O₄ phase, and Magnetic particles in which the ratio of the Fe₃O₄ phase present on the surface of the above metal magnetic particles is less than 70%.
  19. In Paragraph 18, A magnetic particle in which the area occupied by the Fe₃O₄ phase among the plurality of phases in the cross-section of the metal magnetic particle is 19%-42.3% of the total area of the plurality of phases.
  20. In Paragraph 18, At least a portion of the above Fe₃O₄ phase is a magnetic particle existing in the central part of the cross-section passing through the center of the metal magnetic particle.

Description

Magnetic Particle and Magnetic Components The present invention relates to magnetic particles and magnetic components. In the case of magnetic components such as inductors, common mode filters, LC filters, baluns, and magnetic recording media, the intended magnetic properties are generally achieved by including magnetic particles inside the body. Here, the magnetic particles can be formed from ferrite-based or metallic-based magnetic materials. In magnetic components, achieving low resistance, high DC bias characteristics, and high efficiency requires miniaturizing magnetic particles and increasing packing density while reducing losses. However, amidst the trend toward miniaturizing magnetic components, the size of the body is also shrinking, which limits the amount of magnetic particles that can be contained within the body. Furthermore, molding the body under high pressure to increase the packing density may lead to problems such as deformation of the magnetic component. Therefore, a method is required to minimize losses in magnetic components by improving the properties of the magnetic particles. FIG. 1 shows magnetic particles according to one embodiment of the present invention, and FIG. 1(a) and FIG. 1(b) correspond to a transmission perspective view and a cross-sectional view, respectively. FIGS. 2 to 5 show magnetic particles according to modified embodiments. FIG. 6 is a schematic transmission perspective view showing a magnetic component according to one embodiment of the present invention. Figure 7 is a schematic II' plane cross-sectional view of the magnetic component of Figure 6. Figures 8 and 9 show an enlarged view of one area of the body in the magnetic part of Figure 6. Figure 10 shows the magnetic particles of Figure 9. FIGS. 11 to 15 show magnetic components having a wound coil structure. Embodiments of the present invention will be described below with reference to specific embodiments and the attached drawings. However, embodiments of the present invention may be modified in various different forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation, and elements indicated by the same reference numerals in the drawings are the same elements. FIG. 1 shows magnetic particles according to one embodiment of the present invention, and FIG. 1(a) and FIG. 1(b) correspond to a transmission perspective view and a cross-sectional view, respectively. FIG. 2 to 4 show cross-sectional views of magnetic particles according to modified examples. Referring to FIG. 1, in the present embodiment, the magnetic particle (100) comprises a metal magnetic particle (101) having a plurality of phases (121-125). The magnetic particle (100) may also comprise an oxide film (110) formed on the surface of the metal magnetic particle (101). The plurality of phases (121-125) included in the metal magnetic particle (101) include an Fe-based phase (122) and an Fe₃O₄ phase ( 123-125 ). In this case, the content ratio of the Fe₃O₄ phase ( 123-125 ) among the plurality of phases (121-125) is less than 50%. That is, the Fe₃O₄ phase ( 123-125 ) is less than the sum of the contents of the remaining phases (121, 122). The metal magnetic particles (101) constituting the magnetic particles (100) contain both the Fe-based phase (122) and the Fe₃O₄ phase (123-125), and by adjusting their relative content as in the following embodiment, the coercivity of the magnetic particles (100) can be effectively lowered. When the magnetic particles (100) with such lowered coercivity are used in magnetic components, the efficiency characteristics can be improved by reducing losses. Additionally, the plurality of phases (121-125) may include an amorphous phase (121) as a partial phase. The main components of the magnetic particles (100) will be described in detail below. The Fe-based phase (122) of the metal magnetic particle (101) may include one or more materials selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni) to secure magnetic properties. Specifically, the Fe-based phase (122) may include a metal containing Fe, Si, and Cr. As a more specific example, the Fe-based phase (122) may include at least one of pure iron, Fe-Si alloy, Fe-Si-Al alloy, Fe-Ni alloy, Fe-Ni-Mo alloy, Fe-Ni-Mo-Cu alloy, Fe-Co alloy, Fe-Ni-Co alloy, Fe-Cr alloy, Fe-Cr-Si alloy, Fe-Si-Cu-Nb alloy, Fe-Ni-Cr alloy, and Fe-Cr-Al alloy. For example, when the Fe-based phase (122) includes an Fe-Cr-Sr alloy, the weight percentage of Si and Cr may be 15% or less, and as a more specific example, 0.80 weight% < Si < 12.5 weight%, 2.5 weight% < Cr < 14.2 weight%. FIG. 1 illustrates a case