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:email@example.com, Tel.: +91-023126905230 firstname.lastname@example.org 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. References  K. Yoshii, A. Nakamura, “Reversal of Magnetization in La0.5Pr0.5CrO3”, J. Solid State. Chem. 155, 2, (2000), pp. 447-450.  J. Mao, Y. Sui, X. Zhang, Y. Su, X. Wang, Z. Liu, Y. Wang, R. Zhu, Y. Wang, W. Liu, J. Tang, “Temperatureand magnetic field induced magnetization reversal in perovkite YFe0.5Cr0.5O3”, Appl. Phys. Lett. 98, (2011), pp. 192510-3.  S. Gharetape, M. Singh, F. Razavi, D. Crandles, L. Zhao, K. Leung, “Effect of vanadium deficiency on properties of polycrystalline LaVO3”, Appl. Phys. Lett. 98, (2011), pp. 052509-3.