Evolution of spatial spin-modulated structure with La doping in Bi1-yLayFeO3 multiferroics

Autor: N.E. Gervits, V.S. Pokatilov, A.O. Makarova, A. A. Gippius, S. V. Zhurenko, Alexey V. Tkachev, A. N. Bagdinova
Rok vydání: 2021
Předmět:
Zdroj: Journal of Magnetism and Magnetic Materials. 517:167341
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2020.167341
Popis: In this paper we present study of the magnetic structure of multiferroic series Bi1-yLayFeO3 (y = 0, 0.015, 0.03, 0.05 and 0.10) using nuclear magnetic resonance (NMR) at 4.2 K and Mossbauer spectroscopy at room temperature on 57Fe nuclei. We observed the presence of cycloid type spatial spin-modulated structure (SSMS) in the whole range of compositions. The study of the concentration dependence of the anharmonicity parameter m revealed that at the temperature of liquid helium in the composition region y = 0 – 0.10 as well as at room temperature for y = 0.03 the magnetic state of multiferroics is described by cycloid type SSMS with a positive effective uniaxial constant of magnetic anisotropy Κu > 0 (“easy axis” model). The study at room temperature in turn revealed that magnetic state of the multiferroics with y = 0 – 0.03 is described by cycloid type SSMS with a positive effective uniaxial constant of magnetic anisotropy Κu > 0 (“easy axis” model). In contrast, the magnetic state of multiferroics with y = 0.05 and 0.10 is described by a negative effective uniaxial constant of magnetic anisotropy Κu
Databáze: OpenAIRE
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