Magnetic Properties of Two‐Line Ferrihydrite Nanoparticles.

Two‐line ferrihydrite particles are synthesized. Structural characterization of the sample is done with an X‐ray diffractometer, transmission electron microscope, Fourier‐transform infrared spectroscope, and thermogravimetric analyzer. Average particle size is 2 nm. Temperature variation (10–300 K) of zero‐field‐cooled and field‐cooled susceptibility in 500 G applied magnetic field bifurcates at 50 K. The field‐cooled susceptibility below this temperature is almost temperature independent. Magnetization versus applied magnetic field (0–120 kG) data at 300 K are analyzed considering particle size distribution. [ABSTRACT FROM AUTHOR]