Preparation method of core-shell structure soft and hard magnetic nano double-phase particles with controllable shell thickness

By controlling the shell thickness of soft and hard magnetic nanoparticles through spray pyrolysis, the problem of poor coupling effect between soft and hard magnetic phases in existing technologies has been solved, enabling the preparation of high-performance magnetic materials suitable for high-density magnetic recording media and spintronic devices.

CN121922472APending Publication Date: 2026-04-24Hangzhou Gongshu District University of Technology Future Technology Research Institute +1
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Patent Information

Application Number
CN202511848867.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-09
Publication Date
2026-04-24

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve controllable shell thickness in soft and hard magnetic nanoparticles at the nanoscale, resulting in poor coupling between the soft and hard magnetic phases and limiting the application of high-performance magnetic recording media and spintronic devices.

Method used

By employing a spray pyrolysis method, soft and hard magnetic nanoparticles with a one-shell, multi-core structure were prepared by controlling the concentration of the precursor solution, atomization method, atomization frequency, carrier gas flow rate, and pyrolysis temperature. This achieved dual controllability of the core and shell layers, ensuring good matching and exchange coupling between the soft and hard magnetic phases.

Benefits of technology

Precise control of shell thickness and composition at the nanoscale enables close interfacial contact between soft and hard magnetic phases, improving the saturation magnetization, coercivity, and magnetic energy product of the material, simplifying the preparation process, and making it suitable for high-performance soft and hard magnetic composite materials.

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Abstract

The invention discloses a preparation method of core-shell structure soft and hard magnetic nano double-phase particles with controllable shell thickness. The preparation method comprises the following steps: preparing soft magnetic phase nano particles; preparing a precursor solution containing soft magnetic phase nanoparticles; and carrying out spray pyrolysis on the precursor solution to obtain the soft and hard magnetic nano double-phase particles with a one-shell multi-core structure. The one-shell multi-core soft and hard magnetic nano double-phase particles with double controllable core layers and shell layers are obtained through a spray pyrolysis method, the thickness and components of the shell layers can be accurately regulated and controlled at the nanoscale, good soft and hard magnetic matching and exchange coupling performance is achieved, a new way is provided for structure regulation and control and performance optimization of a high-performance soft and hard magnetic composite material, and the method is suitable for large-scale popularization and application. And the complex sol-gel coating or acid pickling step is not needed, the technological process is simplified, and the applicability is high.
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