RT Journal Article
T1 Temperature dependence of the hyperfine magnetic field at Fe sites in Ba-Doped BiFeO_(3) thin films studied by emission Mossbauer spectroscopy
A1 Heiniger-Schell, Juliana
A1 Bharuth-Ram, Krish
A1 Naicker, Kimara
A1 Masondo, Vusumuzi
A1 Dang, Thien Thanh
A1 Escobar, Marianela
A1 Díaz-Guerra Viejo, Carlos
A1 Marschick, Georg
A1 Masenda, Hilary
A1 Gunnlaugsson, Haraldur P.
A1 Qi, Bingcui
A1 Unzueta, Iraultza
A1 Olafsson, Sveinn
A1 Adhikari, Rajdeep
A1 Peters, Gerrard
A1 Naidoo, Deena
A1 Schaaf, Peter
A1 Zyabkin, Dmitry
A1 Johnston, Karl
A1 Becker, Sven
A1 Jakob, Gerhard
AB Emission Fe-57 Mossbauer spectroscopy (eMS), following the implantation of radioactive Mn-57(+) ions, has been used to study the temperature dependence of the hyperfine magnetic field at Fe sites in Ba-doped BiFeO3 (BFO) thin films. 57Mn fi decays (t(1/ 2) = 90 s) to the 14.4 keV Mossbauer state of Fe-57, thus allowing online eMS measurements at a selection of sample temperatures during Mn implantation. The eMS measurements were performed on two thin film BFO samples, 88 nm and 300 nm thick, and doped to 15% with Ba ions. The samples were prepared by pulsed laser deposition on SrTiO_3 substrates. X-ray diffraction analyses of the samples showed that the films grew in a tetragonal distorted structure. The Mossbauer spectra of the two films, measured at absorber temperatures in the range 301 K-700 K, comprised a central pair of paramagnetic doublets and a magnetic sextet feature in the wings. The magnetic component was resolved into (i) a component attributed to hyperfine interactions at Fe^(3+) ions located in octahedral sites (B_(hf)); and (ii) to Fe^(3+) ions in implantation induced lattice defects, which were characterized by a distribution of the magnetic field B_(Distr). The hyperfine magnetic field at the Fe probes in the octahedral site has a room temperature value of B_(hf) = 44.5(9) T. At higher sample temperatures, the Bhf becomes much weaker, with the Fe3+ hyperfine magnetic contribution disappearing above 700 K. Simultaneous analysis of the Ba-BFO eMS spectra shows that the variation of the hyperfine field with temperature follows the Brillouin curve for S = 5/2.
PB MDPI
YR 2023
FD 2023-04-25
LK https://hdl.handle.net/20.500.14352/102665
UL https://hdl.handle.net/20.500.14352/102665
LA eng
NO 2023 Descuentos MDPI
NO Federal Ministry of Education and Research (German)
NO Unión Europea. H2020
NO Ministerio de Economía y Competitividad (España)
NO Banco de Santander
NO Universidad Complutense de Madrid
NO Austrian Science Fund
NO Icelandic University Research Fund
NO National Research Foundation (South Africa)
NO Fondo Europeo de Desarrollo Regional
NO Gobierno Vasco
DS Docta Complutense
RD 25 ago 2024