1. Introduction The structural and magnetic characterization of plasma arc evaporated Fe nanoparticles with different specific surface areas have been investigated by measurements of AFM, MFM, TEM, SEM, VSM. Particle sizes and shapes were observed by AFM, SEM and TEM measurements. Magnetic properties were found by MFM measurements and field dependent magnetization measurements with VSM. Magnetic Characterization of Plasma Arc Evaporated Fe Nanoparticles O. Tozkoparan 1, O. Yıldırım 1, E. Yuzuak 1, D.Terin 2, S.Venig 2, S. Akturk 3, E. Duman 2, I. Dincer 2, 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 The Fe nanoparticles have been of great importance due to their interesting magnetic properties. Since the magnetic nanoparticles are being used for various applications, such as ferro-fluids, magnetic recording components, bio-medical drug delivery systems, fuel catalysts, etc. The tunable magnetic properties of iron nanoparticles with the changing of specific surface area very important advantages to improve technological applications. Experimental 12 11 10 9 8 7 6 5 4 3 1 2 2 1 – compressor, 2 – receivers, 3 – gas ramp, 4 –feeder materials, 5 –plasma reactor, 6 –gas condenser, 7 –whirle, 8 –unloading bunker, 9 –catching filter, 10, 11, 12 – packet module Figure 1. Arc Plasma Evoprotion System TEM Image of sample #1SEM Image of sample #1 TEM Image of sample #2 SEM Image of sample #2 TEM Image of sample #2 SEM Image of sample #2 Figure 2. TEM and SEM images of Nickel nanoparticles References Topography MFM Phase 0 Oe a) b) Topography MFM Phase 0 Oe e) f) Topography MFM Phase 0 Oe c) d) Fıgure 3. AFM images of samples a), c), e), MFM images of samples b), d), f) Conclusions: a) b) Fıgure 4. a) Magneic Field dependent magnetization graphic, b) is avarege particle size dependent M s graphic Particle size characterization are performed by TEM, SEM and AFM measurements. To eliminate agglomeration, we prepared the samples by using ODCB (orthodichlorobenzene) for AFM and MFM measurements. ODCB preparation helped us to see better nanoparticles for AFM and MFM measurements. From magnetic field dependent magnetization measurement, we found H c, M s values. The M s values of these nanoparticles increased with decreasing average particle size at room temperature. However, we observed the single domain structure for all nanoparticles from MFM measurements. [1] V. Singh et al. Journal of Applied Physics 10907B506 (2011) [2]G. Agarwal et al. Small Journal 4 270-278 (2008). [3] A. Hendyrch et al.. Modern Research Educational Topics in Microscopy. 805- 811 (2007). Corresponding author: elerman@ankara.edu.tr Acknowledgement: We would like to thank to TUBİTAK for supporting(project no: 209T054)

2. Introduction The structural and magnetic characterization of plasma arc evaporated Fe nanoparticles with different specific surface areas have been investigated by measurements of AFM, MFM, TEM, SEM, VSM. Particle sizes and shapes were observed by AFM, SEM and TEM measurements. Magnetic properties were found by MFM measurements and field dependent magnetization measurements with VSM Magnetic Characterization of Plasma Arc Evaporated Fe Nanoparticles O. Tozkoparan 1, O. Yıldırım 1, E. Yuzuak 1, D.Terin 2, S.Venig 2, E. Duman 2, I. Dincer 2, 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 The Fe nanoparticles have been of great importance due to their interesting magnetic properties. since the magnetic nanoparticles are being used for various applications, such as ferro-fluids, magnetic recording components, bio-medical drug delivery systems, fuel catalysts, etc. The tunable magnetic properties of iron nanoparticles with the changing of specific surface area very important advantages to improve technological applications.

3. Introduction The structural and magnetic characterization of plasma arc evaporated Fe nanoparticles with different specific surface areas have been investigated by measurements of AFM, MFM, TEM, SEM, VSM. Particle sizes and shapes were observed by AFM, SEM and TEM measurements. Magnetic properties were found by MFM measurements and field dependent magnetization measurements with VSM. Magnetic Characterization of Plasma Arc Evaporated Fe Nanoparticles O. Tozkoparan 1, O. Yıldırım 1, E. Yuzuak 1, D.Terin 2, S.Venig 2, E. Duman 2, I. Dincer 2, 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 The Fe nanoparticles have been of great importance due to their interesting magnetic properties. since the magnetic nanoparticles are being used for various applications, such as ferro-fluids, magnetic recording components, bio-medical drug delivery systems, fuel catalysts, etc. The tunable magnetic properties of iron nanoparticles with the changing of specific surface area very important advantages to improve technological applications. Experimental 12 11 10 9 8 7 6 5 4 3 1 2 2 1 – compressor, 2 – receivers, 3 – gas ramp, 4 –feeder materials, 5 –plasma reactor, 6 –gas condenser, 7 –whirle, 8 –unloading bunker, 9 –catching filter, 10, 11, 12 – packet module Figure 1. Arc Plasma Evoprotion System TEM Image of sample #1 SEM Image of sample #1 TEM Image of sample #2 SEM Image of sample #2 TEM Image of sample #2 SEM Image of sample #2 Figure 2. TEM and SEM images of Nickel nanoparticles Topography MFM Phase 0 Oe Topography MFM Phase 0 Oe Topography MFM Phase 0 Oe Figure 3. MFM measurements of sample #3 Conclusion