Fept-based magnetic composite film and preparation method thereof

By introducing a composite thin film structure of a transition layer and a carbon-based protective layer into FePt magnetic materials, the cost and performance issues of FePt materials in applications have been solved, achieving high magnetic anisotropy and wear resistance, and expanding its applications in magnetic recording and magnetic lubrication.

CN122136126APending Publication Date: 2026-06-02LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Filing Date
2026-04-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

FePt magnetic materials have problems in practical applications, such as high cost, difficulty in forming an ordered L10 phase, easy coarsening and structural defects, insufficient magnetic properties, poor machinability, insufficient compatibility with semiconductor integration processes, and limited resistance to oxidation and corrosion.

Method used

The FePt-based magnetic composite thin film structure includes a FePt layer, a transition layer, and a carbon-based protective layer arranged sequentially from bottom to top. The FePt layer with an L10 ordered phase is formed by controlling the deposition conditions, and a transition layer is introduced at the interface to improve the bonding strength and stress mismatch. The carbon-based protective layer provides wear resistance and stability.

Benefits of technology

FePt-based magnetic composite films with high magnetic anisotropy, good wear resistance and interface stability have been developed, which are suitable for magnetic recording and magnetic lubrication, thus improving the overall performance and application range of the materials.

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Abstract

This invention discloses a FePt-based magnetic composite thin film and its preparation method. The FePt-based magnetic composite thin film provided by this invention includes, from bottom to top, a FePt layer, a transition layer, and a carbon-based protective layer. The FePt layer is a FePt thin film with an L10 ordered phase. The FePt layer serves as a hard magnetic base layer providing perpendicular magnetic anisotropy, while the carbon-based protective layer possesses high hardness, good wear resistance, and interface stability. The transition layer between the two layers improves the interfacial bonding between the FePt layer and the carbon-based protective layer and mitigates stress mismatch. The provided FePt-based magnetic composite thin film exhibits excellent magnetic and mechanical properties and can be widely used in fields such as magnetic recording and magnetic lubrication.
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