Zinc doping effects on the magnetic properties of Nd_0.65Ca_0.35Mn_0.9Zn_0.1O₃ nanomanganite
by Daly Paul; K.N. Anuradha; S.V. Bhat
International Journal of Nanotechnology (IJNT), Vol. 14, No. 9/10/11, 2017

Abstract: In this paper, we report the synthesis and magnetic properties of Nd_0.65Ca_0.35Mn_0.9Zn_0.1O₃ manganite. Bulk (NZOB) and nanoparticles (NZON) of hole-doped Nd_0.65Ca_0.35Mn_0.9Zn_0.1O₃ were prepared by sol gel method. These particles were characterised by XRD, TEM and EDAX. Magnetisation measurements were carried out in temperature range 10 K ≤ T ≤ 300 K by a SQUID magnetometer. The parent bulk Nd_0.65Ca_0.35MnO₃ (NCMO) manganite exhibits charge order (CO) around the temperature 210 K followed by an antiferromagnetic (AFM) transition at the Neel temperature (T_N = 120 K). With the doping of nonmagnetic Zn²⁺ cation, the valency balance is maintained by the creation of Mn⁴⁺ ions, which leads to ferromagnetism owing to the double exchange interaction between Mn³⁺ and Mn⁴⁺. Magnetisation measurements show that the ferromagnetic component enhances in nanoparticles (NZON) as compared to its bulk counterpart at low temperature, along with some amount of residual antiferromagnetism owing to the uncompensated surface spins. Further the temperature dependence of magnetisation (M*T vs. T) shows the melting of CO in both the samples. The ferromagnetic transition temperature (Tc) is found to be higher (~53 K) in nanosample (size about 20 nm) when compared with its bulk counterpart (~41 K).

Online publication date: Sun, 24-Sep-2017

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