Competition between ferromagnetic and antiferromagnetic states in Al8.5−Fe23Ge12.5+ (0≤x≤3)

Abstract

Polycrystalline Al 7+x Fe 23 Ge 14−x -type orthorhombic Al 8.5−x Fe 23 Ge 12.5+x (0≤x≤3) compounds were studied by X-ray diffraction measurement, metallographic examination, and magnetization and electrical resistivity measurements. The lattice parameters show anisotropic x dependences, reflecting a lower symmetry of rather complex crystal structure. In the x=0 sample, a ferromagnetic (FM) transition occurs at the Curie temperature T C of 255 K, which is systematically reduced with increasing x and disappears at x=2.5 where an

Low-temperature giant coercivity in metallic Co6.2Ga3.8-xGex(x=2.4 to 3.2) with chemically tunable spin frustration

“…The Bethe-Slater curve, widely used for analysing magnetism in magnetic metals, suggests that longer and shorter interatomic distances between magnetic atoms favour FM and AFM interactions, respectively 18 . This tendency has been observed in various intermetallic compounds 19,20 . The selected Co interatomic distances are listed in speculate that the giant coercivity in rare-earth-free magnets with the space group P6 3 /mmc can be attributed to the itinerant d-electrons in geometrically frustrated metals and canted spin structure, in addition to the anisotropic crystal structure.…”

Magnetic properties, electrical resistivity, and hardness of high-entropy alloys FeCoNiPd and FeCoNiPt

“…3(a) or (b). This is one of the effective ways to obtain T C in transition metal-based ferromagnets [27,28,29,30]. Thus obtained T C s are listed in Table 1, and the slight enhancement of T C after the annealing is confirmed in each HEA.…”

Low-temperature giant coercivity in Co6.2Ga3.8−x Ge x (x = 2.4 to 3.2)

“…The Bethe-Slater curve, widely used for analysing magnetism in magnetic metals, suggests that longer and shorter interatomic distances between magnetic atoms favour FM and AFM interactions, respectively [31]. This tendency has been observed in various intermetallic compounds [32,33]. The selected Co interatomic distances are listed in table 3, and, taking into account the multiplicity (2 for Co1-Co1 and Co2-Co2, 6 for Co1-Co3, and 4 for Co2-Co3), Co1-Co3 and Co2-Co3 bonding likely determine the magnetic ordering type.…”