Magnetic heating effect of nanoparticles with different sizes and size distributions

We present a comparative study of dynamic and quasistatic magnetic properties of iron oxide nanoparticles. The samples are prepared by different wet chemical precipitation methods resulting in different sizes and size distributions. The structural characterization was performed by X-ray diffraction and transmission electron microscopy. The heating effect in an ac field in the range 0-30 kA/m at 210 kHz was measured calorimetrically. In addition, a vibrating sample magnetometer was used for hysteresis and remanence curve measurements.

► Preparation of 4 different types of magnetic nanoparticles with mean sizes from 10–20 nm. ► Basic characterization by X-ray diffraction and vibrating sample magnetometry. ► Determination of sizes and size distributions from X-ray and TEM data. ► Calorimetric measurements of the specific heating power in an ac field of 210 kHz and field amplitudes up to 30 kA/m.