Abstract
In this work MnxCo1−xFe2O4 nanoparticles (NPs) were synthesized using a chemical co-precipitation method. Phase purity and structural analyses of synthesized NPs were performed by X-ray diffractometer (XRD). Transmission electron microscopy (TEM) reveals the presence of highly crystalline and narrowly-dispersed NPs with average diameter of 14 nm. The Fourier transform infrared (FTIR) spectrum was measured in the range of 400–4000 cm−1 which confirmed the formation of vibrational frequency bands associated with the entire spinel structure. Temperature-dependent magnetic properties in anti-ferromagnet (AFM) and ferromagnet (FM) structure were investigated with the aid of a physical property measurement system (PPMS). It was observed that magnetic interactions between the AFM (Mn) and FM (CoFe2O4) material arise below the Neel temperature of the dopant. Furthermore, hysteresis response was clearly pronounced for the enhancement in magnetic parameters by varying temperature towards absolute zero. It is shown that magnetic properties have been tuned as a function of temperature and an externally-applied field.
Highlights
Magnetic nanomaterials have been given special attention by the scientists due to their countless applications in the recent era of science
NPs and (b) high resolution inset corresponds to selected area electron diffraction (SAED) pattern of NPs and (b) high resolution (HRTEM) of single nanoparticle and insets belong to inverse fast Fourier transformation (IFFT)
To get information about magnetic properties of Co0.8 Mn0.2 Fe2 O4 (CMF) NPs, zero field cooled (ZFC) and field cooled (FC) magnetization curves were recorded in the temperature range of 5–400 K with an applied field varying from 1 kOe to 10 kOe
Summary
Magnetic nanomaterials have been given special attention by the scientists due to their countless applications in the recent era of science. In the case of an inverse spinel structure half of the trivalent cations (i.e., Fe3+ ) replace divalent ions at tetrahedral sites and the other half replace octahedral sites [6]. Several methods have been employed for synthesis of NPs such as sol gel [15], ball milling [16], hydrothermal [17], co-precipitation [18], thermal plasma methods [19], and auto combustion [20] Among these techniques co-precipitation is an inexpensive, simple, and low-temperature synthesis route of ferrite NPs. In the present work, we synthesized magnetic NPs by substituting 20% Co with Mn ions in. Magnetic measurements have been performed at low temperatures from 5 K to 400 K to monitor the variation in magnetic properties of NPs
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