Title:
NON-NEODYMIUM (ND) PERMANENT MAGNETIC MATERIAL AND PERMANENT MAGNET USING SAME
Document Type and Number:
WIPO Patent Application WO/2024/096305
Kind Code:
A1
Abstract:
The present invention provides a CeFe12-based compound as a permanent magnet for replacing a conventional neodymium magnet Nd2Fe14B. Compared with Ce2Fe14B having a tetragonal crystal and having iron elements that form a layered complex network, the CeFe12 compound having a ThMn12 structure in which iron is uniformly distributed comprises more iron elements than rare earth elements. Therefore, the CeFe12-based compound has a high Curie temperature, and thus is expected to have excellent performance as a permanent magnet. However, CeFe12 has a low coercivity due to dynamic instability and low magnetic anisotropy, and thus has poor permanent magnet performance and is difficult to be actually synthesized and applied. In the present invention, the instability of the CeFe12-based compound has been controlled, as a means of improving the magnetic properties of CeFe12, through Ce f-orbital stabilization by supplying electrons to a CeFe12 system through the insertion of a non-metallic element and the insertion of an element having an atomic size greater than that of Fe, and a means of improving coercivity by increasing the orbital angular momentum of the Ce f-orbit so as to increase magnetic anisotropy has been provided through first principles calculation. Furthermore, the CeFe12-based compound with improved coercivity has been designed through the substitution of 4d- and 5d-transition metals having a spin-orbit interaction greater than that of Fe, and a non-metallic element is inserted into CeFe11M, in which dynamic instability has been resolved, in order to increase coercivity, and thus usefulness in actual synthesis and application has been demonstrated.
Inventors:
SHIM JI HOON (KR)
LEE CHANG HOON (KR)
PARK JAE HOON (KR)
LEE CHANG HOON (KR)
PARK JAE HOON (KR)
Application Number:
PCT/KR2023/013898
Publication Date:
May 10, 2024
Filing Date:
September 15, 2023
Export Citation:
Assignee:
POSTECH RES & BUSINESS DEV FOUND (KR)
MAX PLANCK POSTECH/KOREA RES INITIATIVE (KR)
MAX PLANCK POSTECH/KOREA RES INITIATIVE (KR)
International Classes:
H01F1/01; C22C38/00
Attorney, Agent or Firm:
C.M. PATENT & LAW FIRM, LLP. (KR)
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