NDLI: Magnetic and Magnetocaloric Properties of Zn$_{1−x }$Co$_{ x }$Fe$_{2}$O$

Content Provider	Springer Nature Link
Author	Phan, T. L. Tran, N. Kim, D. H. Dang, N. T. Manh, D. H. Bach, T. N. Liu, C. L. Lee, B. W.
Copyright Year	2017
Abstract	We have prepared Zn$_{1−x }$Co$_{ x }$Fe$_{2}$O$_{4}$ nanoparticles (NPs) by using a hydrothermal method, and then studied their structural and magnetic properties. The analyses of x-ray diffraction (XRD) patterns and Raman scattering spectra reveal that the samples crystallized mainly in a cubic-spinel structure with the lattice parameter a ≈ 8.4 Å. Averaged crystallite sizes determined from the XRD linewidth are about 16–22 nm, close to the particle sizes of 19–28 nm determined from scanning electron microscopy images. Magnetization measurements versus temperature, M(T), in the field H = 100 Oe indicate that the ferromagnetic–paramagnetic (FM-PM) phase transition temperature (T $_{C}$) of Zn$_{1−x }$Co$_{ x }$Fe$_{2}$O$_{4}$ NPs increases from 606 K for x = 0 to ~823 K for x = 1. The features of the M(T) curves also indicate magnetic inhomogeneity in the samples, and their magnetic property is unstable versus temperature. This is ascribed to the changes in the structural characterization and/or concentration of magnetic ions situated at the A and B sites in the spinel lattice. At room temperature, we found that both the saturation magnetization (M $_{s}$) and coercivity (H $_{c}$) increase with increasing Co content, with M $_{s}$ = 59–70 emu/g and H $_{c}$ = 100–1100 Oe. These results reflect that the Co doping into ZnFe$_{2}$O$_{4}$ NPs greatly improves their magnetic property, making them more useful for practical applications. Additionally, we also assess magnetic interactions and the magnetocaloric effect in the samples based on analyzing initial magnetization data, M(H), recorded at temperatures around T $_{C}$.
Starting Page	4214
Ending Page	4226
Page Count	13
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	46
Issue Number	7
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2017-02-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Co-doped zinc ferrites hydrothermal synthesis magnetic properties Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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