Room temperature magnetic anisotropy in Fe2P-type transition metal based alloys

Abstract We explore the crystal structure and magnetic properties of quaternary materials deriving from the hexagonal Fe 2 P, an iron binary known to present a particularly large magnetocrystalline anisotropy potentially interesting for permanent magnets, but with unfortunately a Curie temperature far too low for applications. Using simultaneous metal and metalloid substitutions in Fe 2- z Co z P 1- x B x and Fe 2- z Co z P 1- y Si y quaternaries, we found it is possible to increase the Curie temperature up to at least 640 K while maintaining a c axis uniaxial magnetocrystalline anisotropy, leading to an appreciable magnetic anisotropy at room temperature. In Fe 2-z Co z P 1-x B x , though boron is appropriate to increase the Curie temperature, its amount is limited as it also favors the formation of secondary phases. Contrary to what could be anticipated from the phase diagrams of Fe 2- z Co z P or Fe 2 P 1- y Si y ternaries, simultaneous Co for Fe and Si for P substitutions in Fe 2- z Co z P 1- y Si y are found to significantly expand the range of stability of the Fe 2 P-type crystal structure. X-ray diffraction patterns on powders oriented in magnetic field indicate a c axis uniaxial magnetic anisotropy. Appropriate heat-treatments and slight metal deficiency are found suitable to limit the formation of unwanted secondary phase with 3:1 metal:metalloid ratio. As a result, nearly single-phase Fe 1.95- z Co z P 1- y Si y materials are prepared and exhibit an appreciable magnetic anisotropy with K 1 up to approximately 0.93 MJm −3 at room temperature. This study experimentally demonstrates that Fe 2 P-type transition metal quaternaries can present an interest not only for their first-order magnetic transition, but also for their magnetic anisotropy making them potential candidates for magnetostatic applications.