Enhancing electromagnetic properties of flaky Fe-Si-B-Nb-Cu nanocrystalline soft magnetic composites via atomic layer deposition-induced uniform insulating layers

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-05-31 DOI:10.1016/j.materresbull.2025.113587

Bang Zhou , Wenyue Song , Chunyun Jiang , Jiayi He , Min Nie , Chunlei Dai , Hai Guo , Bo Li

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引用次数: 0

Abstract

Achieving a uniform insulating layer on the surface of flaky soft magnetic powders remains a challenge for soft magnetic composites (SMCs) due to the edge effect. Atomic layer deposition (ALD) was used to deposit a continuous and homogeneous insulating layer onto flaky Fe-Si-B-Nb-Cu powders. Compared to untreated powder, the SiO₂ layer coated by ALD on the surface of the phosphate-treated powder not only smooths the edges but also improves the homogeneity of the insulation layer. As a result, the improved inter-particle insulation further enhances frequency stability and DC bias performance and reduces core loss (P_cv) of the NPP@SiO₂ nanocrystalline SMCs. Additionally, the uniformly distributed coatings improve the temperature stability of both effective permeability (μ_e) and P_cv. The NPP@SiO₂ nanocrystalline SMCs exhibits a constant μ_e of 56 up to 5 MHz, DC bias performance %μ_e of 55 % at 100 Oe, and low P_cv of 187 mW/cm³ at 50 kHz and 0.1 T This study presents a promising strategy for achieving effective insulation treatment of flaky powders and lays the foundation for future industrial applications of ALD technology in SMCs.

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原子层沉积诱导均匀绝缘层增强片状Fe-Si-B-Nb-Cu纳米晶软磁复合材料的电磁性能

由于边缘效应的存在，如何在片状软磁粉末表面形成均匀的绝缘层一直是软磁复合材料面临的挑战。采用原子层沉积法（ALD）在片状Fe-Si-B-Nb-Cu粉末上沉积连续均匀的绝缘层。与未处理粉末相比，ALD在磷酸盐处理粉末表面涂覆的SiO2层不仅使边缘光滑，而且提高了保温层的均匀性。因此，改进的颗粒间绝缘进一步提高了NPP@SiO₂纳米晶SMCs的频率稳定性和直流偏置性能，并降低了磁芯损耗（Pcv）。此外，均匀分布的涂层提高了有效渗透率μe和Pcv的温度稳定性。NPP@SiO₂纳米晶SMCs在5 MHz范围内的恒定μe为56，在100 Oe时的直流偏置性能%μe为55%，在50 kHz和0.1 T时的低Pcv为187 mW/cm3。该研究为片状粉末的有效绝缘处理提供了一个有希望的策略，为ALD技术在SMCs中的未来工业应用奠定了基础。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.