1. [1] The Chemical Society of Japan (Ed.): Ultrafine Particle Science and Application, JSSP, 28 (1985). [2] B. D. Plouffe et al. Journal of Magnetism and Magnetic Materials, 323, 2310-2317 (2011) [3] A. Hendyrch et al.. Modern Research Educational Topics in Microscopy. 805-811 (2007). [4] M. Shima et al. J.M.M.M, 295 132–138 (2005). Corresponding author: elerman@ankara.edu.tr Acknowledgement: We would like to thank to TUBİTAK for supporting(project no: 209T054) The magnetic nanoparticles have a wide application areas in today’s technology. With their high surface area volume ratio they have interesting and useful applications than bulk materials. Controlling magnetic properties of magnetic nanoparticles gives a chance to produce better permanent magnets, fuel cells, solar cells, magnetic sensors. The structural properties of Nickel nanoparticles have been studied by TEM, SEM and AFM measurements and magnetic properties have been investigated for different sizes. The magnetic properties of these nanoparticles are also studied temperature dependence of magnetization measurement in the temperature range between 300K and 650 K. Nickel nanoparticles obtained with the help of Plasma Arc Evaporation Technique. The compositions of Nickel nanoparticles have been investigated by EDX analysis. Five different Ni nanoparticles with different Specific Surface Areas, are investigated for this study. Particle sizes of these nanoparticles are found by AFM,SEM, TEM measurements. NT-MDT’s Solver Pro-M atomic force microscope is used for MFM measurements with NSG\01 Co probes which has 5,5 N/m spring constant and 232 quality factor. Golden Substrate Nanoparticles ODCB Evaporation Ultrasonic Cleaner ODCB AFM-MFM Figure 1.Sample preparation for AFM and MFM measurements TEM Image of sample #1SEM Image of sample #1 TEM Image of sample #2 SEM Image of sample #2 TEM Image of sample #3SEM Image of sample #3 Figure 2. TEM and SEM images of Nickel nanoparticles Fıgure 3. AFM images of samples a), c), e), MFM images of samples b), d), f) TopographyMFM Phase 0 Oe Topography MFM Phase 0 Oe Topography a) b) c) e) f) d) a) b) c)d) From magnetic field dependent magnetization measurements, we observed that the saturation magnetization values decreased with increasing average particle size values. The blocking temperatures-T B were determined from temperature dependent magnetization measurements for 2nd. and 3rd. Nickel nanoparticles. Nickel nanoparticles domain structure were found from MFM measurements. The MFM results showed these nanoparticles have single domain structure Figure 4. a),b) Temperature dependent magnetization graphics, c) is Magnetic Field dependent magnetization graphic, d) is avarege particle size dependent M s graphic

2. Introduction The magnetic nanoparticles have a wide application areas in today’s technology. With their high surface area volume ratio they have interesting and useful applications than bulk materials. Controlling magnetic properties of magnetic nanoparticles gives a chance to produce better permenant magnets, fuel cells, solar cells, magnetic sensors. The structural properties of Nickel nanoparticles have been studied by TEM, SEM and AFM measurements and magnetic properties have been investigated for different sizes. The magnetic properties of these nanoparticles are also studied temperature dependence of magnetization measurement in the temperature range between 300K and 650 K. Magnetic Characterization of Plasma Arc Evaporated Ni Nanoparticles O.Yildirim 1, O.Tozkoparan 1, E. Yuzuak 1, D. Terin 2, S.Venig 2,S. Akturk 3, E. Duman 1, I. Dincer 1, Y. Elerman 1* 1 Ankara University, Faculty of Engineering, Department of Engineering Physics, 06100 Besevler, Ankara, Turkey 2 University of Saratov State, Department of Nano- and Biomedical Technology, 410012, Saratov, Russia 3 Mugla University, Faculty of Science, Department of Physics 48000, Kotekli, Mugla Experimental Nickel nanoparticles obtained with the help of Plasma Arc Evaporation Technique. The compositions of Nickel nanoparticles have been investigated by EDX analysis. Five different Ni nanoparticles with different Specific Surface Areas, are investigated for this study.. Particle sizes of these nanoparticles are found by AFM,SEM, TEM measurements. NT-MDT’s Solver Pro-M atomic force microscope is used for AFM measurements with NSG\DLC ultra-sharp probes which has 1nm curvature radius. Golden Substrate Nanoparticles ODCB Evaporation Ultrasonic Cleaner ODCB AFM-MFM Figure 1.Sample preparation for AFM and MFM measurements [1] The Chemical Society of Japan (Ed.): Ultrafine Particle Science and Application, JSSP, 28 (1985) [2]M.A. Lapshina et al. Journal of Surface Investigation 3 559-565 (2008) [3] A. Hendyrch et al.. Modern Research Educational Topics in Microscopy. 805-811 (2007) [4] M. Shima et al. J.M.M.M, 295 132–138 (2005) References TEM Image of sample #1SEM Image of sample #1 TEM Image of sample #2 SEM Image of sample #2 TEM Image of sample #3SEM Image of sample #3 Figure 2. TEM and SEM images of Nickel nanoparticles MFM measurements of sample #1 TopographyMFM Phase 0 Oe MFM measurements of sample #2 MFM Phase 0 Oe Topography MFM measurements of sample #3 Conclusion MFM Phase 0 Oe Topography

3. Introduction The magnetic nanoparticles have a wide application areas in today’s technology. With their high surface area volume ratio they have interesting and useful applications than bulk materials. Controlling magnetic properties of magnetic nanoparticles gives a chance to produce better permenant magnets, fuel cells, solar cells, magnetic sensors. The structural properties of Nickel nanoparticles have been studied by TEM, SEM and AFM measurements and magnetic properties have been investigated for different sizes. The magnetic properties of these nanoparticles are also studied temperature dependence of magnetization measurement in the temperature range between 300K and 650 K. Magnetic Characterization of Plasma Arc Evaporated Ni Nanoparticles O.Yildirim 1, O.Tozkoparan 1, E. Yuzuak 1, D. Terin 2, S.Venig 2,S. Akturk 3, E. Duman 1, I. Dincer 1, Y. Elerman 1* 1 Ankara University, Faculty of Engineering, Department of Engineering Physics, 06100 Besevler, Ankara, Turkey 2 University of Saratov State, Department of Nano- and Biomedical Technology, 410012, Saratov, Russia 3 Mugla University, Faculty of Science, Department of Physics 48000, Kotekli, Mugla Experimental Nickel nanoparticles obtained with the help of Plasma Arc Evaporation Technique. The compositions of Nickel nanoparticles have been investigated by EDX analysis. Five different Ni nanoparticles with different Specific Surface Areas, are investigated for this study.. Particle sizes of these nanoparticles are found by AFM,SEM, TEM measurements. NT-MDT’s Solver Pro-M atomic force microscope is used for AFM measurements with NSG\DLC ultra-sharp probes which has 1nm curvature radius. Golden Substrate Nanoparticles ODCB Evaporation Ultrasonic Cleaner ODCB AFM-MFM Figure 1.Sample preparation for AFM and MFM measurements [1] The Chemical Society of Japan (Ed.): Ultrafine Particle Science and Application, JSSP, 28 (1985) [2]M.A. Lapshina et al. Journal of Surface Investigation 3 559-565 (2008) [3] A. Hendyrch et al.. Modern Research Educational Topics in Microscopy. 805-811 (2007) [4] M. Shima et al. J.M.M.M, 295 132–138 (2005) References TEM Image of sample #1SEM Image of sample #1 TEM Image of sample #2 SEM Image of sample #2 TEM Image of sample #3SEM Image of sample #3 Figure 2. TEM and SEM images of Nickel nanoparticles MFM measurements of sample #1 TopographyMFM Phase 0 Oe MFM measurements of sample #2 MFM Phase 0 Oe Topography MFM measurements of sample #3 Conclusion MFM Phase 0 Oe Topography