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Enhanced magnetoresistance of La2/3Ca1/3MnO3/Sr2FeMoO6 core/cell nanocrystalline composites synthesized by polymer-network sol-gel method

Published online by Cambridge University Press:  31 January 2011

Xi Shen ,
Lide Yao ,
Hua Yang ,
Qing Zhao ,
Changqing Jin  and
Richeng Yu
Lide Yao
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Hua Yang
Affiliation:
State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China
Qing Zhao
Affiliation:
Department of Physics, School of Science, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
Richeng Yu*
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: rcyu@aphy.iphy.ac.cn
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Abstract

This paper reports that the homogeneous nanocrystalline LCMO(core)/SFMO(shell) and SFMO(core)/LCMO(shell) series composites are successively synthesized using polymer-network sol-gel method. With the increase of SFMO content in the composites, the remanence magnetization Mr increases while the coercivity Hc decreases. This fact indicates that the ferromagnetic phase boosts up. Moreover, the LFMR (1 T) of the composites succeeds the preponderances of both SFMO and LCMO; i.e., the magnetoresistance (MR) value increases from 300 to 5 K and keeps a high level. In particular, the MR value of the LS-8 composite reaches 55% at 5 K and 7 T.

Keywords

Magnetoresistance (magnetic)Magnetoresistance (transport)Core/shell
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 2 , February 2010 , pp. 255 - 259
Copyright
Copyright © Materials Research Society 2010

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References

REFERENCES

1.Sánchez, R.D., Rivas, J., Vázquez-Vázquez, C., López-Quintela, M.A., Causa, M.T., Tovar, M., Oseroff, S.Giant magnetoresistance in fine particle of La0.67Ca0.33MoO3 synthesized at low temperature. Appl. Phys. Lett. 68, 134 (1996)CrossRefGoogle Scholar
2.Hueso, L.E., Rivas, J., Rivadulla, F., López-Quintela, M.A.Tuning of colossal magnetoresistance via grain size change in La0.67Ca0.33MnO3. J. Appl. Phys. 86, 3881 (1999)Google Scholar
3.Zhao, L.F., Chen, W., Shang, J.L., Chen, L., Liu, S., Xia, Z.C., Yuan, S.L.Giant magnetoresistance on low field in non-stoichiometric La2/3Ca1/3Mn1−xO3. J. Phys. D: Appl. Phys. 38, 2480 (2005)Google Scholar
4.Siwach, P.K., Singh, H.K., Srivastava, O.N.Low field magnetotransport in manganites. J. Phys. Condens. Matter 20, 273201 (2008)Google Scholar
5.Zener, C.Interaction between the d-shells in the transition metals. 2. Ferromagnetic compounds of manganese with perovskite structure. Phys. Rev. 82, 403 (1951)Google Scholar
6.Karmakar, S., Taran, S., Chaudhuri, B.K., Sakata, H., Sun, C.P., Huang, C.L., Yang, H.D.Study of grain boundary contribution and enhancement of magnetoresistance in La0.67Ca0.33MnO3/V2O5 composites. J. Phys. D: Appl. Phys. 38, 3757 (2005)CrossRefGoogle Scholar
7.Hwang, H.Y., Cheong, S-W., Ong, N.P., Batlogg, B.Spin-polarized intergrain tunneling in La2/3Sr1/3MnO3. Phys. Rev. Lett. 77, 2041 (1996)CrossRefGoogle ScholarPubMed
8.Kobayashi, K-I., Kimura, T., Sawada, H., Terakura, K., Tokura, Y.Room-temperature magnetoresistance in an oxide material with an ordered double-perovskite structure. Nature 395, 677 (1998)Google Scholar
9.Hwang, H.Y., Cheong, S-W.Low-field magnetoresistance in the pyrochlore Tl2Mn2O7. Nature 389, 942 (1997)Google Scholar
10.Hwang, H.Y., Cheong, S-W.Enhanced intergrain tunneling magnetoresistance in half-metallic CrO2 films. Science 278, 1607 (1997)Google Scholar
11.Ren, G.M., Yuan, S.L., Yu, G.Q., Miao, J.H., Xiao, X., Guan, H.G., Wang, Y.Q., Yin, S.Y.Effect of sintering temperature on electrical transport in La0.67Ca0.33MnO3/BaTiO3 composites. J. Phys. D: Appl. Phys. 39, 4867 (2006)Google Scholar
12.Miao, J.H., Yuan, S.L., Xiao, X., Ren, G.M., Yu, G.Q., Wang, Y.Q., Yin, S.Y.Giant magnetoresistance and unusual hysteresis behavior in La0.67Ca0.33MnO3/xCuO (x = 20%) composite. J. Appl. Phys. 101, 043904 (2007)Google Scholar
13.Yao, L.D., Zhang, W., Zhang, J.S., Yang, H., Li, F.Y., Liu, Z.X., Jin, C.Q., Yu, R.C.Enhanced magnetoresistance of La2/3Ca1/3 MnO3/CeO2 nanocrystalline composites synthesized by polymer-network gel method. J. Appl. Phys. 101, 063905 (2007)CrossRefGoogle Scholar
14.Zhang, J.S., Yu, R.C., E, P., Li, F.Y., Li, X.D., Liu, J., Feng, C.G., Jin, C.Q.Structural stability and electrical properties of Sr2Fe1+xMo1-xO6−δ under high pressure. J. Alloys Compd. 384, 67 (2004)CrossRefGoogle Scholar
15.Yao, L.D., E., P., Zhang, J.S., Zhang, W., Li, F.Y., Jin, C.Q., Yu, R.C.Magnetic and magnetotransport properties of La2/3Ca1/3MnO3/Sr2FeMoO6 nano-crystalline composites synthesized under high pressure. Physica B 403, 2241 (2008)Google Scholar
16.Yuan, C.L., Wang, S.G., Song, W.H., Yu, T., Dai, J.M., Ye, S.L., Sun, Y.P.Enhanced intergrain tunneling magnetoresistance in double perovskite Sr2FeMoO6 polycrystals with nanometer-scale particles. Appl. Phys. Lett. 75, 3853 (1999)Google Scholar