Powder XRD patterns at room temperature for sintered (, 0.2, and 0.3) samples.
ZFC-FC curves, obtained at 10 Oe, of the samples (a) and (b). Inset: detail of the ZFC curve of the sample.
Real part and imaginary part of the ac susceptibility of the and 0.3 samples (measured with a frequency of 1 kHz and ac applied field of 1 Oe).
Hysteresis loops, obtained at 5 K and cooled without applied field, of the (, 0.2, and 0.3) samples. The inset shows an enlargement of the loops at low fields.
Hysteresis loops of the and samples at low temperature cooled under different applied fields. The loops were obtained at 5 K excepting the one for the sample, 30 kOe (at 2.5 K).
Hysteresis loop of the sample at 5 K (left) and 65 K (right) after cooling under an applied field of 65 kOe, before (dashed line) and after (continuous line) subtracting a linear contribution from the loop. The low figures show detail, focusing on the hysteresis loops after subtracting the linear contribution.
Evolution of the exchange bias, , and coercive field (detail) with the temperature after cooling down under an applied field of 65 kOe for the (circles), (squares), and (diamonds) samples.
Hysteresis loops of the sample at 5 K cooled under 65 kOe from different temperatures.
Thermoremanence of the sample after cooling under an applied field of 65 kOe from 100 and 25 K.
Mössbauer spectra of (, 0.2, and 0.3) samples collected at 4.2 K.
Mössbauer spectra of (, 0.2, and 0.3) samples collected at 293 K.
Nominal and analytical composition of the samples.
Lattice parameters of the samples. The values in brackets show the estimated error in the last significant number.
Hyperfine parameters, relative intensity , valence state, and Fe sites observed in Mössbauer spectra obtained at 4.2 and 293 K. The isomer shift and the quadrupole shift have been obtained from the initial fit, while the mean quadrupole splitting and the mean hyperfine field of the respective distributions have been obtained from the second refinement.
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