The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 2026
Filed:
Nov. 24, 2025
China Jiliang University, Hangzhou, CN;
Hangfu Yang, Hangzhou, CN;
Lei Zhou, Hangzhou, CN;
Qiong Wu, Hangzhou, CN;
Xiukun Hu, Hangzhou, CN;
Jiage Jia, Hangzhou, CN;
Hongliang Ge, Hangzhou, CN;
CHINA JILIANG UNIVERSITY, Hangzhou, CN;
Abstract
The present invention discloses a method for preparing Nd—Fe—B-diffused permanent magnets based on pressure gradients, involving the steps preparing a Nd—Fe—B permanent magnet precursor through a mechanical grinding process, a press molding process, and a sintering process; cutting the Nd—Fe—B permanent magnet precursor into a Nd—Fe—B permanent magnet sample with a lateral size of 80-150 μm and a thickness of 5-20 μm; and forming a film of rare earth elements or other metal elements on one side of the Nd—Fe—B permanent magnet sample by magnetron sputtering as a diffusion source, so as to obtain a lateral heterojunction structure. For this method, it is possible to enable the rare earth elements to efficiently and uniformly penetrate the NdFeB grains and the grain boundaries, so as to noticeably enhance coercivity and thermal stability of materials without damaging crystalline orientation, reducing magnetic energy product loss and improving overall performance of permanent magnets.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile