Magnetic Properties of 4f-3d Intermetallics Studied by¹⁶¹Dy and⁵⁷Fe Mössbauer Effect

Abstract

Applications of the Mössbauer effect at the 161 Dy and "Fe nuclei to study heavy rare earth -transition metal compounds are presented. Magnetic hyperfine fields at dysprosium and iron nuclei observed in the Dyu (M-M)v intermetallics (u/v = 2/17, 6/23, 1/3, and 1/2; M-M = Mn-Fe, Fe-Co, and Co-Ni), magnetic moments and magnetic ordering temperatures are discussed. The magnetic hyperfine field at iron nuclei and the field at dysprosium nuclei treated as functions of a number of 3d electrons form two different systems of the Slater-Pauling curves. The magnetic ordering temperatures treated as functions of the number of 3d electrons also form the u/v system of curves. Considermg the magnetic data and the magnetic hyperfine fields it can be concluded that intermetallics can be treated as three-subsystem ferrimagnets. Consequently, a coexistence between the 4f, 5d, and 3d magnetism in the rare earth -transition metal compounds can be qualitatively explained.

Electrical resistivity and Mössbauer effect studies of Dy(Mn0.4−xAlxFe0.6)2 and Dy(Mn1−xFex)2 intermetallics

“…3 (open circles). All the Curie temper- Table 1 Magnetic hyperfine field µ 0 H hf , average number n 3d of 3d electrons, splitting energy E and Curie temperature T C of the Dy(Mn 0.4−x Al x Fe 0.6 ) 2 [9,24] and Dy(Mn 1−x Fe x ) 2 [25,26] ature data follow nonlinearly the fitted polynomial formula T C (x) (K) = 1032(99)x 2 − 817(50)x + 337(10).…”

“…The T C values are also given in Table 1. Table 1 contains also the literature data [24,25]. The error T C can be estimated to be equal to 5-20 K depending on x.…”