NdFe12N hard-magnetic compound with high magnetization and anisotropy field

Abstract

The NdFe 12 N x compound with a ThMn 12 structure (space group I4/mmm) was successfully synthesized by nitriding an NdFe 12 layer grown on a W underlayer on a single-crystalline MgO (001) substrate. The c-axis expanded from 0.480 to 0.492 nm while the a-axis showed a slight contraction from 0.852 to 0.849 nm after the nitriding. Excellent intrinsic hard magnetic properties of l 0 M s % 1.66 ± 0.08 T, l 0 H a % 8 T, and T c % 550°C, which are superior to those of Nd 2 Fe 14 B, were obtained.

First-principles study on stability and magnetism of NdFe11M and NdFe11MN for M = Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn

“…The total magnetic moments of NdFe 11 Co and their nitrogenated compounds have almost the same values as those of NdFe 12 and its nitrogenated compound, and have much larger values than those of NdFe 11 Ti(8i), which are previously studied in theories and experiments. 1,2,11,12,32 Next the values of r …”

“…However, the synthesis of RFe 12 has been succeeded only as a film sample. 1,13,14 A third element is necessary to stabilize the ThMn 12 -type crystal structure as a bulk sample. Thus far, several elements are known to stabilize the structure.…”

First-Principles Study of Structural and Magnetic Properties of R(Fe,Ti)12 and R(Fe,Ti)12N (R = Nd, Sm, Y)

“…However, the lattice constant was fixed at the experimental value of NdFe 11 Ti and NdFe 11 TiN and lattice distortion is also observed in Ref. [8].…”

“…Interstitial nitrogenation also increases r 2 A 0 2 , and thus substantially enhances uniaxial anisotropy. Very recently, a new magnet compound NdFe 12 N was synthesized as thin film sample [8], and its intrinsic magnet property is better than Nd 2 Fe 14 B. Especially the magnetization of NdFe 12 N is quite large.…”

A (Nd, Zr)(Fe, Co)11.5Ti0.5Nx compound as a permanent magnet material

“…The magnetic hardness parameter (κ) 11 of the nitrided alloy (B) was calculated as κ > 1.04 ∼ 1.22, but that of the similar composition thin-film material was κ = 1.73, in references. 12 The high performance of (Nd 0.7 , Zr 0.3 )(Fe 0.75 , Co 0.25 ) 11.5 Ti 0.5 N x (x = 0.9 wt %) can be explained as follows. First, the starting alloy prepared by the SC method was homogeneous compared with the arc-melted alloys that have been used in previous studies.…”