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Maaz, K.,Karim, S.,Kim, G.H. North Holland ; Elsevier Science Ltd 2012 Chemical physics letters Vol.549 No.-
Ni<SUB>x</SUB>Co<SUB>1-x</SUB>Fe<SUB>2</SUB>O<SUB>4</SUB> (x~0.3) nanoparticles were synthesized via chemical co-precipitation method. The particle size (d) was found to increase linearly with increasing annealing temperature. Magnetic studies revealed that the coercivity (H<SUB>C</SUB>) attains a value of 965Oe at ~18nm and then decreases for larger particles. The behavior of H<SUB>C</SUB> with d was attributed to the superparamagnetic nature of smaller nanoparticles, whereas for larger particles it was attributed to domain transformation mechanism. Both saturation magnetization (M<SUB>S</SUB>) and superparamagnetic blocking temperature (T<SUB>b</SUB>) were found to increase linearly with increasing size of the nanoparticles.
Magnetic properties of one-dimensional embedded nickel nanostructures in gold nanowires
S. Ishrat,K. Maaz,Rong Chen,김수현,정명화,김길호 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Magnetic nanostructures of nickel embedded in gold were successfully fabricated by electrochemical deposition in porous alumina templates. Structural characterization of the samples confirmed the formation of pure phase, crystalline multi-segmented AueNieAu nanowires. Magnetic characterization of the wires reveals that ferromagnetism arises as a result of Ni embedded in Au segments. An interesting behavior of coercivity was observed that showed a rapid decrease of coercivity for smaller Ni segments while a monotonic decrease was found for the larger segments. Finally, the saturation magnetization of the wires exhibited a slower increase for smaller Ni segments while a sharp increase was observed for larger Ni segments.
Magnetic properties of one-dimensional embedded nickel nanostructures in gold nanowires
Ishrat, S.,Maaz, K.,Chen, R.,Kim, S.H.,Jung, M.H.,Kim, G.H. Elsevier 2012 Current Applied Physics Vol.12 No.1
Magnetic nanostructures of nickel embedded in gold were successfully fabricated by electrochemical deposition in porous alumina templates. Structural characterization of the samples confirmed the formation of pure phase, crystalline multi-segmented Au-Ni-Au nanowires. Magnetic characterization of the wires reveals that ferromagnetism arises as a result of Ni embedded in Au segments. An interesting behavior of coercivity was observed that showed a rapid decrease of coercivity for smaller Ni segments while a monotonic decrease was found for the larger segments. Finally, the saturation magnetization of the wires exhibited a slower increase for smaller Ni segments while a sharp increase was observed for larger Ni segments.