Hyperfine interactions in the Bi1−xLaxFeO3 ferrites (x = 0.0225, 0.075, 0.9)

Abstract

Hyperfine interactions in the Bi 1−x La x FeO 3 ferrites (where x = 0.0225, 0.075, 0.9) have been studied by means of 57 Fe Mössbauer spectroscopy and 140 Ce time differential perturbed angular γ -γ correlation methods. The information about the line shift δ, the lattice ε lat and the magnetic ε mag contributions to the quadrupole shift ε, isotropic H is and anisotropic H an contributions to the hyperfine magnetic field H hf on 57 Fe nuclei, anharmonicity parameter m, distribution of the hyperfine magnetic field p(H hf ), and supertransferred hyperfine magnetic fields on 140 Ce probe nuclei were obtained. In all studied compounds, the Fe ions are in a high-spin trivalent state. In the compounds with x = 0.0225 and 0.075 spatially modulated cycloidal magnetic structures exist. It was found that the sign of the effective constant of magnetic anisotropy K eff changes with the variation of x from 0.0225 to 0.075. The substitution of Bi by La increases the value of the hyperfine magnetic field on 57 Fe nuclei from 494 kOe in Bi 0.9775 La 0.0225 FeO 3 to 520 kOe in Bi 0.1 La 0.9 FeO 3 , i.e. by 26 kOe, while the corresponding supertransferred hyperfine magnetic field on 140 Ce probe nuclei decreases. Keywords Hyperfine interactions • Mössbauer spectroscopy • TDPAC • MultiferroicsThis article is part of the Topical Collection on

Induced Hyperfine Field in Doped Chalcopyrite Compounds Cu(In_1-xA_x)S₂ (A = V and Cr)

“…The TM atoms are substituted at the cation site of In 3+ rather than Cu 1+ due to the stability of the system in terms of the minimum energy. There were a few attempts to calculate HF in ternary compounds by introducing 3d TM and some other atoms [7][8][9] . The hyperfine interactions in the Bi 1−x La x FeO 3 ferrites, HF at Mn site in the intermetallic compound LaMnSi 2 , and magnetic interactions and different magnetic properties in Fe 1−x M x Sb 2 O 4 , M = Mg, Co, were investigated by the research groups of Pokatilov 7 , Domienikan 8 , and Berry 9 , respectively.…”