The future of rare earth-transition metal magnets of type RE2TM17 (invited)

Abstract

Articles you may be interested inCharacterization of magnetization processes in nanostructured rare earth-transition metal films J. Appl. Phys. 93, 8116 (2003); 10.1063/1.1537701 Magnetic properties of hydrides of rare earth-transition metal glasses J. Appl. Phys. 53, 7798 (1982); 10.1063/1.330166Microstructure and magnetism in amorphous rare earth-transition metal thin films Magnetism in rare earthtransition metal amorphous alloy films AIP Conf.A brief review of the development of RE2TM17 permanent magnets is followed by a summary of the state-ofthe-art. Excellent magnetic properties have been achieved in the laboratory for single-phase 2:17 and twophase, precipitation hardened magnets of -2:15 stoichiometry. Both achieve reduction of cobalt content to -50 wt. % by transition metal substitution and the precipitation hardened type exhibit improved temperature characteristics. Recent improvements in coercivity make high volume application practical if the more abundant light rare earths can be successfully substituted for samarium.

A General Synthesis of Soft Magnetic 2:17‐Type Rare‐Earth Cobalt Nanoalloys Decorated with Graphite as High‐Frequency Electromagnetic Materials

“…[6b,10b,41] Commonly, inplane magnetic anisotropy RE 2 Co 17 alloys with low magnetocrystalline anisotropy constants often exhibit soft magnetism with low coercivity. [42] It has been improved that the coercivity of magnetic particles can be tuned by particle sizes along with their distribution and surface coatings. [43] Particularly, the occurrence of interfaces caused by surface oxidation between the oxidized and unoxidized parts in the superficially oxidized magnetic metal or alloy particles would hinder their magnetic domain wall movement and then result in their increased coercivity.…”