Magnetic behaviour of Ni0.4Zn0.6Co0.1Fe1.9O4 spinel nano-ferrite

Thakur, Atul; Thakur, Preeti; Hsu, Jen-Hwa

doi:doi:10.1063/1.3670606

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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Soft Magnetic Materials

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J. Appl. Phys. 111, 07A305 (2012); http://dx.doi.org/10.1063/1.3670606 (3 pages)

Magnetic behaviour of Ni_0.4Zn_0.6Co_0.1Fe_1.9O₄ spinel nano-ferrite

Atul Thakur¹, Preeti Thakur¹, and Jen-Hwa Hsu²

¹Physics Department, Shoolini University, Solan (H.P.) 173229, India
²Department of Physics, National Taiwan University, Taipei 106, Taiwan

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(Received 19 September 2011; accepted 13 October 2011; published online 9 February 2012)

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Abstract

References (26)

Article Objects (4)

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Nanoparticles of the spinel ferrite Ni_0.4Zn_0.6Co_0.1Fe_1.9O₄, have been synthesized by a co-precipitation method. The x-ray diffraction patterns of the particles confirmed the formation of single-phase cubic spinel structure. The Langevin function fitting on M-H data at 300 K gives a log-normal particle size distribution with median diameter of 59.6 nm and standard deviation of 0.6. The isothermal dc magnetization studies have been performed using the superconducting quantum interface device and vibrating sample magnetometer in the temperature range of 5-300 K. These measurements show that the sample is superparamagnetic above the blocking temperature T_B ∼ 253 K when an external magnetic field of 20 Oe is applied. The reduction in saturation magnetization in case of nanoparticles may be attributed to the fact that magnetic moments in the surface layers outside the core are in the state of frozen disorder. A doublet observed in the Mössbauer study also confirms the superparamagnetic behavior and nanocrystalline formation.

KEYWORDS, PACS, and IPC

Keywords

cobalt compounds, magnetic moments, magnetisation, nanofabrication, nanoparticles, nickel compounds, paramagnetic materials, particle size, precipitation, superparamagnetism, X-ray diffraction, zinc compounds

PACS

81.16.-c

Methods of micro- and nanofabrication and processing
75.30.Cr

Saturation moments and magnetic susceptibilities
68.65.-k

Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties
75.20.-g

Diamagnetism, paramagnetism, and superparamagnetism
61.46.Df

Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects

International Patent Classification (IPC)

B82B1/00
Nano-structures
B82B3/00
Manufacture or treatment of nano-structures
H01F13/00
Apparatus or processes for magnetising or demagnetising

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3670606

PUBLICATION DATA

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0021-8979 (print)

1089-7550 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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J. Appl. Phys. 108, 014301 (2010)JAPIAU000108000001014301000001

J. Appl. Phys. 26, 1381 (1955)JAPIAU000026000011001381000001

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