(a) Rietveld refinement plot of HRXRD data of S750 sample. (b) FESEM image of S1150 sample.
(a) Magnetization vs. temperature plot of S750 sample at 170 Oe dc magnetic field. Inset shows its magnified view. (b) Magnetization vs. Temperature plot of S1150 sample at 60 Oe dc magnetic field. Inset shows the linear real part of ac susceptibility of S1150 sample at different frequencies.
(a) Linear real part of ac susceptibility of S750 sample at different frequencies at 3 Oe ac magnetic field. (b) Plot of log (1/ƒ) as a function offreezing temperature Tƒ. Upper inset shows the variation of Tƒ with frequency.
(a) Waiting time dependence of ZFC relaxation magnetization. (b) Magnetic memory effect observed of S750 sample. The main panel shows the memory effect during FC protocol. The data FC_cool have been collected in the measuring field of 100 Oe with the intermittent stop of 10 000 s at 105 and 95 K. The reference field cooled data have been shown as a line. Inset shows its magnified view of at 105 K. Inset of (a) shows the magnified view of above protocol at 95 K.
(a) The number of field cycles n dependences of HE (open symbol) at 5 K after FC in 7 kOe magnetic field. The solid lines show the best fitting with the power law to the data for n ≥ 2. The solid symbols show the data originated from the Eq. (1) (see the text). Inset shows the M-H loop of S750 sample after field cooled with 10 kOe magnetic field. (b) The number of field cycles n dependences of ME (open symbol) at 5 K after FC in 7 kOe magnetic field. The solid lines show the best fitting with the power law to the data for n ≥ 2. The solid symbols show the data originated from the Eq. (1) (see the text).
(a) The variation of exchange bias parameter HE with temperature after FC with a magnetic field at 10 kOe. Inset shows almost linear plot of ln HE vs. T. (b) The plot of scaled vertical shift with horizontal shift described in the text. Solid straight line is the guide to the eye for linear fit. Inset shows the variation of exchange bias parameter HC with temperature after FC at a magnetic field of 10 kOe.
(a) HE vs. cooling field (Hcool) plot of S750 sample. Inset shows the HC vs. Cooling field (Hcool) plot of S750 sample. (d) The ME vs. cooling field plot of S750 sample.
The schematic representation of the phenomenological model for bulk manganites and the corresponding nanograins, described in the text.
Parameters obtained from Rietveld refinement of HRXRD data and experimental data of the samples.
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