www.theinternationaljournal.org > RJSITM: Volume: 02, Number: 05, March-2013 Page 22 Study of CoFe 2 O 4 nano-particles energy absorption used a new induction heating design operating at 100W-100 kHz E. I. A. Elbeshir 1 , O. A. Yassin 2 , Khalil A. Ziq 3 1. Department of Physics, Faculty of Engineering and Technology, Al Gazira University, SUDAN 2. Department of Physics, Faculty of Science, Taibah University, A-Madinah Al-Munawarh, KSA 3- Department of Physics, King Fhad University of Petroleum and Minerals, Dhahran, KSA abugomry@yahoo.com Abstract. We have studied the specific absorption rate (SAR W/g) of five samples of nano-particles CoFe 2 O 4 . The sample of CoFe 2 O 4 synthesized by the co-precipitation method, and characterized by X- ray diffraction. The study carried out using a home-made induction heating system operating at 100W- 100kHz, showed that SAR values increase as the concentration of the CoFe 2 O 4 magnetic nano- particles (MNPs) sample decreases. Study on the effect of output power on the SAR, show that the SAR value increases with the output power increases. Keywords: Magnetic nano-particles, hyperthermia. 1. Introduction. The capability of magnetic nano-particles (MNPs) to act as effective heating agents for magnetic hyperthermia (MH) was demonstrated many years ago (Pankhurst et al., 2003,T.E. Torres, et al., 2009). Considerable efforts have been made in the synthesis and characterization of MNPs to assess their capacities as heat generating agents and to establish the mechanisms governing heat generation at the nano-scale (Goya G F, et al., 2008). Several studies have shown a link between the MNPs energy absorption in alternative current magnetic field (ACMF) and their concentration Andrew (J. Giustini; et al., 2010). For enhancing the performance of the CoFe 2 O 4 MNPs for better heating and delivery, they are made in different concentrations. We present a study of CoFe 2 O 4 MNPs having different concentrations viz 1.0, 2.0, 3.0, 4.0 and 5.0 mg/ml, and relate these concentrations with the SAR values. 2. Experimental details. 2.1. Sample preparation. Analytically pure powder of FeCl 3 ·6H 2 O, CoCl 2 ·6H 2 O, and NaOH were used as the raw materials for solutions preparation. The mixed solution of 0.533 mol/L FeCl 3 ·6H 2 O and 0.267 mol/L CoCl 2 ·6H 2 O was slowly added to 6 mol/L NaOH solution under stirring speed 3000 rpm stirred for 30 min, and the pH was controlled to be between 11–13. The synthesized suspension was then immersed in water bath for 2 h after, and then the sediment was washed 10 times with de-ionized water until the pH to7. Brown precipitate (precursor) was obtained after filtration, and then heated for 500 0 C for 2 hours. Co Fe 2 O 4 , MNPs were obtained after cooling (Y. Chen, et al 2010). 2.2. X-ray diffraction. The Shimadzu X-ray Diffractometer (XRD-6000) in Department of Physics, King Fhad University of Petroleum and Minerals, Kingdom of Saudi Arabia was used in this study. The XRD- 6000, an X-ray diffractometer analyze crystalline states under normal atmospheric conditions. This method is non destructive. X-rays focused on a sample fixed on the axis of the spectrometer (goniometer) are diffracted by the sample. The changes in the diffracted X-ray intensities are measured, recorded and plotted against the rotation angles of the sample. The result is referred to as the XRD pattern of the sample. Computer analysis of the peak positions and intensities associated with this pattern enables qualitative analysis, lattice constant determination and/or stress determination of the sample. Qualitative analysis may be conducted on the basis of peak height or peak area. The peak angles and profiles may be used to determine particle diameters and degree of