Journal of Inorganic Materials ›› 2020, Vol. 35 ›› Issue (11): 1223-1226.DOI: 10.15541/jim20200055

• RESEARCH PAPER • Previous Articles     Next Articles

Magnetic Properties and Resistivity of Soft Magnetic Composites Regulated by SPS Enhanced Interface Reaction Mechanism

ZHAO Zhankui, LI Tao, LU Shuhan, WANG Minggang, ZHANG Jingjing, CHENG Daowen, WU Chen, CHI Yue, WANG Hongli   

  1. Key Laboratory of Advanced Structural Materials, Ministry of Education, School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China
  • Received:2020-02-03 Revised:2020-03-04 Published:2020-11-20 Online:2020-03-05
  • About author:ZHAO Zhankui(1969-), male, professor. E-mail:

Abstract: The design trend of the insulating layer of soft magnetic composite materials (SMCs) is to consider both their soft magnetic properties and resistivity. In this study, using Fe/Ni0.5Zn0.5Fe2O4 composite system as an example, the influence of MnO2 oxidant on the soft magnetic properties and resistivity of the samples is studied, and the redox mechanism resulting from spark plasma sintering (SPS) at SMCs interface which improves the soft magnetic properties and resistivity is revealed. The Fe@Ni0.5Zn0.5Fe2O4(MnO2) core-shell composite powders with different amount of MnO2 (0, 0.1wt%, 0.3wt%, 0.5wt%, 1.0wt%) are prepared by ball milling, the Fe/Ni0.5Zn0.5Fe2O4(MnO2) bulk SMCs are prepared by SPS. Their structures are characterized by SEM and XRD, and their electromagnetic properties are tested by precise resistance tester and vibrating sample magnetometer. It is found that the resistivity of Fe/Ni0.5Zn0.5Fe2O4(MnO2) bulk SMCs with 0.5wt% MnO2 is 33.7% higher than that without MnO2, the saturation magnetic induction strength is 6.9% higher. The results show that the SPS sintering enhances the rapid REDOX reaction at the SMCs interface, and the addition of MnO2 oxidants changes the ions concentration of ferrite at the SMCs interface, shows multiple effects of simultaneously improving the soft magnetic properties and resistivity of SMCs, because it reduces the B-bit electron transition frequency, increases the effective Bohr magneton number, and improves the B-B magnetic superexchange.

Key words: soft magnetic composite materials, spark plasma sintering, interface reaction, resistivity, magnetic properties

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