NDLI: Signature of multiferroicity and impedance analysis of Co$_{1−x}$Zn$_{x}$Fe$_{2−x}$La$_{x}$O$

Content Provider	Springer Nature Link
Author	Shankar, S. Kumar, Manish Brijmohan, P. Kumar, Shiv Thakur, O. P. Ghosh, Anup K.
Copyright Year	2016
Abstract	Effects of Zn$^{2+}$/La$^{3+}$ co-doping on multiferroic and impedance properties of co-precipitation derived Co$_{1−x}$Zn$_{x}$Fe$_{2−x}$La$_{x}$O$_{4}$ (x = 0.0, 0.1 and 0.3) nanoparticles have been investigated. The powder X-ray diffraction study confirms the pure phase, cubic spinal structure and particle size varies between 20 and 22 nm. The particle size decreases with increase in co-substitution indicating the short range ordering in CoFe$_{2}$O$_{4}$. The relaxations in dielectric constant follow Maxwell–Wagner polarization and arise out of charge transfer of Co and Fe ions in multi-oxidation states. The co-substitution of Zn$^{2+}$/La$^{3+}$ in CoFe$_{2}$O$_{4}$ at A and B sites respectively results in improvement of Nquist plot and impedance of the nanoparticle which confirms space charge polarization caused by piling of charges at the interface of grain and grain boundries. An unusual relaxation behavior is also observed in co-substituted CoFe$_{2}$O$_{4}$ which may be useful in enhancing the multiferroic properties at room temperature. It could be noted the GBs are more resistive as compared to the grains, resulting in high impedance value and non-Debye type behavior in the Co$_{1−x}$Zn$_{x}$Fe$_{2−x}$La$_{x}$O$_{4}$ nano particles. Low and stable coercivity (H$_{c}$) of 393.13 Oe have been observed and a stable saturation magnetization has been achieved at room temperature. P–E loops have rounded corners which may be the due to the aggregation of CoFe$_{2}$O$_{4}$ nanoparticles with each other resulting out of their strong magnetization. Simultaneous occurrence of saturation magnetization and weak ferroelectricity (P–E loop) with high values of impedance and dielectric constant confirm the signature of multiferroicity in Co$_{1−x}$Zn$_{x}$Fe$_{2−x}$La$_{x}$O$_{4}$ nanoparticles.
Starting Page	13259
Ending Page	13265
Page Count	7
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	27
Issue Number	12
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2016-08-08
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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