Structure and magnetic properties of Gd3(Fe1−xCox)25Cr4 compounds

Abstract

The structural and magnetic properties of Gd3(Fe1−xCox)25Cr4 compounds with x=0–0.6 have been investigated. The structures of all the compounds investigated are found to possess monoclinic symmetry and belong to the A2/m space group. Substitution of Co for Fe leads to a clear contraction of the unit-cell volume. The Curie temperature increases from 492 K for x=0 to 762 K for x=0.6. The composition dependence of the saturation magnetization at 5 K reaches a maximum around x=0.3. It is noteworthy that substitution of Co for Fe results in a significant change of the magnetocrystalline anisotropy of the Co sublattice, and changes the easy magnetization direction of Gd3(Fe1−xCox)25Cr4 compounds from basal plane to easy axis.

Formation, structure and magnetic properties of Nd3Fe26.8 xCoxV2.2compounds

“…In order to investigate the room temperature magnetocrystalline anisotropy of the compounds, the XRD patterns of [11,12], where the anisotropy at room temperature is dependent on the content of Co and has an easy-axis-type anisotropy for x 10. It is well known that in the R-T compounds there exist three exchange interactions: the R-R interactions between the R magnetic moments within the R sublattice, the T-T exchange interactions between the T magnetic moments within the T sublattice and the R-T interactions between the R moments and T moments.…”

“…Yang et al [10] have synthesized Sm 3 (Fe,Ti) 29 N y compounds that exhibit outstanding intrinsic permanent magnetic properties. Subsequently, Yang et al [11] and Wang et al [12] have synthesized Gd 3 Fe 29−x−y Co x Cr y compounds with the substitution of Co for Fe and found that Gd 3 (Fe 1−x Co x ) 25 Cr 4 compounds show a room temperature uniaxial magnetocrystalline anisotropy for x 0.4, which is important for application as permanent materials. These results indicated a prospective application of the noninterstitial R 3 M 29−x T x compounds as permanent magnetic materials.…”

Structural and magnetic properties of Y3(Fe1−Co )27.5V1.5 (0 ≤x≤ 0.4)

“…In the case of Nd 3 (Fe 1 − x Co x ) 27.7 Ti 1.3 compounds it has been found that the canted anisotropy (x = 0) turns gradually to uniaxial for x > 0.1, towards the [4 0 −2] direction which corresponds to the c-axis of the 1:12 phase and lies in the 1:5 basal plane [4]. Yang et al [5] and Wang et al [6] observed that for the case of Gd 3 (Fe 1 − x Co x ) 25 Cr 4 compounds the anisotropy is planar with the EMD also lying near to the [4 0 −2] direction. For x > 0.3 the Gd containing compounds also change the anisotropy to uniaxial, but here the EMD lies perpendicular to the basal plane towards the [2 0 4] direction.…”

“…In order to improve the understanding of the behavior of Co and Fe in R 3 (Fe, TM) 29 substituted alloys, several groups have studied the replacement of Fe by Co in this system synthesized with various rare earths [1][2][3][4][5][6][7][8][9]. It has been shown that the Curie temperature, the saturation magnetization, and the magnetocrystalline anisotropy of these compounds are strongly affected by the Co content.…”

Influences of Co on structural and magnetic properties of R3(Fe1−Co )29−M (R=rare earth metal, M=transition metal) intermetallic compounds

“…y = 1.5) a disordered variant of the hexagonal Th 2 Ni 17 -type structure is formed [12]. Yang et al [13] have investigated the structure and magnetic properties of the Gd 3 (Fe 1−x Co x ) 25 Cr 4 compounds with x ranging from 0 to 0.6 and found that when x > 0.4 the compounds show room temperature uniaxial anisotropy. Uniaxial anisotropy has been also observed in the case of Nd when 0.1 < x < 0.4 [7], and Sm [5,11].…”