Studies on magnetic properties of Sr0.6Ca0.4MnO3thick
film: Negative magnetization
Rani Pawar, V. Phadtare, Vijaya Puri*
Thick and Thin Film Device lab, Department of Physics, Shivaji University, Kolhapur, India
*
Corresponding author’s e-mail:vijayapuri1@gmail.com, Tel.: +91-023126905230
rani.ddrrpp.pawar@gmail.com
This paper reports the studies on magnetic
properties of Sr0.6Ca0.4MnO3 thick film synthesized by
chemical co precipitation method. The Sr0.6Ca0.4MnO3
thick film c shows negative magnetization below ~42 K;
above this temperature it shows paramagnetic nature
and below this it shows antiferromagnetic nature.
Keywords: Manganite, perovskite, negative magnetization,
thick films, magnetic properties
Introduction
In recent years, negative magnetization has been
reported for various perovskite structures [1–3].
Different scenarios were proposed to explain this
abnormal behavior. Negative magnetization effect
can develop remarkable technological perspective for
device applications, for example, thermally assisted
magnetic random access memories, thermomagnetic
switches and other multifunctional devices, in a
preselected and convenient manner.
Experimental
Sr1-xCaxMnO3 powders were prepared by
chemical co-precipitation method using strontium
nitrate, calcium nitrate, manganese nitrate and oxalic
acid as starting materials. Thick film paste of Sr1xCaxMnO3 was prepared by mixing the manganite
powder (84 wt. %) with organic vehicle and Bi2O3
(8wt. %) and an inorganic binder (8 wt. %). The
manganite pastes were then screen printed on the
alumina substrate, dried and then fired in a muffle
furnace at 950°C for 1 hour.
Results and discussions
The diffraction pattern shows monoclinic to
orthorhombic phase transition as Ca concentration
increases. The symmetry of crystal is changed from
monoclinic to orthorhombic due to the addition of a
small amount of Ca in SrMnO3.
In order to gain a deeper understanding of
magnetic properties and to confirm the AFM
behavior at low temperature we carried out field
dependent magnetization measurements up to 7.0 T.
The field dependence of magnetization at different
temperatures is shown in figure 1. Magnetization
decreases with increasing temperature and the
maximum magnetization appears at 2 K. At
temperatures below 42 K thick film shows the
hysteresis loop but above 42 K hysteresis loop
vanishes. It means that below 42 K thick film show
antiferromagnetic behavior and above 42 K it shows
paramagnetic nature which is also seen from FC and
ZFC curve. Also at temperature above 200 K thick
film becomes diamagnetic in nature.
25
2K
-3
2
Magnetization (x 10 emu/cm )
Abstract
50 K
20
100 K
15
300 K
200 K
10
5
0
-5
-10
-15
-20
-25
-6
-4
-2
0
2
4
6
Magnetic field (T)
Fig.1. Magnetic field dependence of magnetization of
Sr0.6Ca0.4MnO3 thick film at different temperature in
the field of 100Oe
Acknowledgments
One of the authors Vijaya Puri would like to
thank the UGC India for Award of Research Scientist
‘C’. R.P. Pawar would like to thank the DST PURSE
scheme for their financial support. All authors
acknowledge the UGC-SAP and DST FIST.
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