Superior high-frequency performances of Fe-based soft-magnetic nanocrystalline alloys

Jiang, Miaomiao; Cai, Mingjuan; Zhou, Jing; Di, Siyi; Li, Xuesong; Luo, Qiang; Shen, Baolong

doi:10.1016/j.mtnano.2023.100307

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…In this work, a distinct amorphous structure with a critical state was developed based on an order modulation strategy to fabricate ASMCs with prominent comprehensive soft magnetic properties. Annealing amorphous alloys under a transverse or longitudinal magnetic field is beneficial to the formation of medium-range order (MRO) [22,23]. Compared with the unidirectional magnetic field annealing, the rotating magnetic field annealing (RFA) not only promotes the formation of ordered structures, but also can reduce the unexpected field-induced magnetic anisotropy that has a detrimental effect on magnetic softness [24].…”

Section: Introductionmentioning

confidence: 99%

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Shao,

Bai,

et al. 2024

Mater. Futures

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Soft magnetic composites (SMCs) play a pivotal role in the development of high-frequency, miniaturization and complex forming of modern electronics. However, they usually suffer from a trade-off between high magnetization and good magnetic softness (high permeability and low core loss). In this work, utilizing the order modulation strategy, a critical state in a FeSiBCCr amorphous soft magnetic composite (ASMC), consisting of massive crystal-like orders (CLOs, ~1 nm in size) with the feature of α-Fe, is designed. This critical-state structure endows the amorphous powder with the enhanced ferromagnetic exchange interactions and the optimized magnetic domains with uniform orientation and fewer micro-vortex dots. Superior comprehensive soft magnetic properties at high frequency emerge in the ASMC, such as a high saturation magnetization (Ms) of 170 emu/g and effective permeability (μe) of 65 combined with a core loss (Pcv) as low as 70 mW/cm3 (0.01 T, 1 MHz). This study provides a new strategy for the development of high-frequency ASMCs, possessing suitable comprehensive soft magnetic performance to match the requirements of the modern magnetic devices used in the third-generation semiconductors and new energy fields.

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Section: Introductionmentioning

confidence: 99%

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Shao,

Bai,

et al. 2024

Mater. Futures

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“…In the past few decades, extensive efforts have been devoted, and many strategies have been proposed to improve soft magnetic properties of nanocrystalline alloys, e.g., microalloying techniques [6,[12][13][14] and producing thinner amorphous ribbons. [15,16] In development of better nanocrystalline alloys, the challenge lies in achieving high permeability at high frequency while maintaining other magnetic properties such as the high saturation magnetic flux density (B s ) and the low core loss (P cv ). In addition, the recently developed nanocrystalline alloys often exhibit both of deterioration of soft-magnetic properties and poor manufacturability under industrial conditions, which are not expected in practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Despite extensive research, there has been no breakthrough in the development of better soft magnetic materials, except for obtaining ultrathin ribbon samples by optimizing of manufacturing process. [15,16] Based on the conventional nanocrystallization strategy, there is very little room for further refinement of nanocrystals. Therefore, innovation of the nanocrystallization mechanism and further refinement of nanocrystalline structure are the key to break through the limits of soft magnetic properties of Fe-based nanocrystalline alloys.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Permeability at High Frequencies via A Magnetic‐Heterogeneous Nanocrystallization Mechanism in an Iron‐Based Amorphous Alloy

Zhou

Hou

et al. 2023

Advanced Materials

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The prevalence of wide‐bandgap (WBG) semiconductors allows modern electronic devices to operate at much higher frequencies. However, development of soft magnetic materials with high‐frequency properties matching the WBG‐based devices remains challenging. Here we report a promising nanocrystalline‐amorphous composite alloy with a normal composition Fe75.5Co0.5Mo0.5Cu1Nb1.5Si13B8 in atomic percent, producible under industrial conditions, which shows an exceptionally high permeability at high frequencies up to 36000 at 100 kHz, an increase of 44% compared with commercial FeSiBCuNb nanocrystalline alloy (25000±2000 at 100 kHz), outperforming all existing nanocrystalline alloy systems and commercial soft magnetic materials. The alloy is obtained by a unique magnetic‐heterogeneous nanocrystallization mechanism in an iron‐based amorphous alloy, which is different from traditional strategy of nanocrystallization by doping non‐magnetic elements (e.g., Cu and Nb). The induced magnetic inhomogeneity by adding Co atoms promotes locally the formation of highly ordered structures acting as the nuclei of nanocrystals, and Mo atoms agglomerate around the interfaces of nanocrystals, inhibiting nanocrystal growth, resulting in an ultrafine nanocrystalline‐amorphous dual‐phase structure in the alloy. The exceptional soft magnetic properties are shown to be closely related to the low magnetic anisotropy and the unique spin rotation mechanism under alternating magnetic fields.This article is protected by copyright. All rights reserved

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Magnetism in Bulk and Thin Film Metallic Glass Systems

Bhattacharya

2024

Indian Institute of Metals Series

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Superior high-frequency performances of Fe-based soft-magnetic nanocrystalline alloys

Cited by 10 publications

References 35 publications

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Ultrahigh Permeability at High Frequencies via A Magnetic‐Heterogeneous Nanocrystallization Mechanism in an Iron‐Based Amorphous Alloy

Magnetism in Bulk and Thin Film Metallic Glass Systems

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