(Color online) X-ray diffraction of the Fe/SiO2 nanocomposite with the Miller indices shown for BCC Fe. The insets show TEM images of samples annealed at Ta = 700 °C and Ta = 720 °C with size distribution of the 720 °C sample. The left (right) corner of the inset is 24 × 21 nm2 (408 × 397 nm2).
(Color online) Room temperature Mössbauer spectra of the two samples annealed at 700 °C and 720 °C.
Temperature variations of the magnetic susceptibilities of the two samples are shown along with the difference χ(FC) − χ(ZFC shown as solid lines).
Magnetization vs. magnetic field plots shown for the two samples at 5 K and 300 K with the inset showing the zoom of the low field region.
(Color online) Detailed magnetization vs. field data shown for the 30 nm sample at temperatures 2, 10, 20, 50, and 325 K with the inset showing temperature dependence of HC, Mr, and MS.
(a) EMR line profiles for the 30 nm sample at temperatures T = 5, 10, 17, 25, 35, 50, 63, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, and 300 K are shown; temperature variations of ΔH and resonance field Hr of the 17 nm and 30 nm samples are shown in (b) and (c), respectively.
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