Novel magnetic Mg2Y hexaferrite nano particles prepared
by combustion method
R. Tholkappiyan1, K.Vishista1*
*
1
Department of Physics, Anna University, Chennai-600025, India
Corresponding author’s e-mail:vishista@yahoo.com, Tel.: +91-44-22358717
Abstract
Novel Sr2Mg2Fe12O22 (Mg2Y) nano particles were
synthesized by combustion method. The formation of pure
phase was confirmed by X-ray diffraction and FTIR studies.
The chemical elements and states on the surface were studied
by XPS. The magnetic property of this hexaferrite was
analyzed by VSM.
Keywords: Hexaferrite, nano particles, combustion method, Xray photo electron spectroscopy, magnetic properties.
Introduction
Recently, researchers are much involved in the
preparation of the magnetic materials in the order of
nano scale; mainly hexaferrite based magnetic materials
due to their various attractive physical and magnetic
properties. Among the various type of hexaferrite
materials, Y type of hexaferrites has important
applications in the field of data storage devices,
spintronics and magnetic cell separation. Mg2Y comes
under Y-type of hexaferrite materials with the general
formula A2Me2Fe12O22 where A and Me refer to
divalent metal ions. In previous studies, different types
of hexaferrite have been synthesized and reported.
Since, no report has been published on Mg2Y
hexaferrite. In the present work, we report the synthesis
of Mg2Y by combustion method. The obtained nano
particles were characterized by XRD, FTIR, XPS and
VSM.
energy were identified from XPS measurements. The
magnetic property of this nano particle was studied by
vibrating scanning microscope (VSM). Fig. 1 shows the
magnetization curves (M-H) obtained for the Mg2Y
hexaferrite nano particle at room temperature with
applied magnetic field of 12 kOe. The values of
saturation magnetization (Ms), coercivity (Hc) and
remanence (Mr) for this nano particle were found to be
42.44 emu/g,268 Oe and 10.05 emu/g.
The squareness ratio (Mr/Ms) for this hexaferrite was
also calculated from Ms and Mr data and found to be
0.24 respectively. It can be observed from the Fig. 1 that
coercivity value is of a few hundred oersted for this
samples thereby showing the soft character of these
ferrites. Low value of coercivity is favorable for
security, switching and sensing applications and is one
of the necessary conditions for electromagnetic (EM)
materials [1, 2]
Experimental
Novel Sr2Mg2Fe12O22 nano particle has been
prepared by combustion method by varying the fuelstoichiometry composition.
Fig. 1: M-H loop of Mg2Y hexaferrite nano particles at
room temperature.
Result and discussions
X-Ray diffraction studies reveal the formation
of hexagonal phase Sr2Mg2Fe12O22. The average
crystallite of the prepared hexaferrite was 45 nm as
calculated from scherrer formula. From FTIR studies,
the stretching vibrations corresponding to the metaloxygen bond were analyzed. The surface phenomenon
and oxidation states of these hexaferrite samples were
characterized by X-Ray photoelectron spectroscopy.
Detailed surface analysis of core level spectra of Sr 3d,
Fe 2p, Mg 2p and O 1s peak with corresponding binding
References
[1] Mukhtar Ahmad, R. Grössinger, M. Kriegisch, F.
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hexaferrites synthesized by sol-gel autocombustion
process”, Curr. Appl. Phys. 12 (2012) 1413–1420.
[2] Mukhtar Ahmad, R. Grössinger, M. Kriegisch, F.
Kubel, M.U. Rana, “Characterization of Sr-substituted
W-type hexagonal ferrites synthesized by sol-gel
autocombustion method”. J. Magn. Magn. Mater. 332
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