Acta Metallurgica Sinica (English Letters) >
Effects of ferrites on magnetic transport properties in La2/3Sr1/3MnO3/ferrites composites
Received date: 2008-02-27
Revised date: 2008-06-27
Online published: 2009-10-10
Effects of soft-magnetic MnZn ferrite (Mn0.5Zn0.5Fe2O4, MZF) and hard-magnetic Ba
ferrite (BaO?6Fe2O3, BaM) on the structure and magnetic transport properties of [La2/3Sr1/3MnO3]
(LSMO)/(x) [ferrites] (ferrites=MZF, BaM) composites have been investigated. It was found that the inclusion of MZF phase reduces
magnetization and ferromagnetic-paramagnetic transition temperature (Tc) of the composites. With increasing the content of the
dopants, the high-temperature magnetoresistance (MR) decreases, whereas low-temperature MR increases and reaches 42% at 150~K and
x=0.1. However, for the LSMO/BaM composites, magnetization and ferromagnetic-paramagnetic transition temperature (Tc)
decrease firstly as x<5 %, and then increase as x>5 %. The resistivity of the composites increases by five orders of magnitude
at x=1 % and is out of measured range at x=5 %. High magnetic field has little effect on the resistivity and magnetoresistance for
the composites with x>5 %, which may originate from the pinning effect of BaM grains.
Key words： Composites; Magnetoresistance; Spin-dependent scattering; tunneling effect
Zhengyou ZHOU , Xiaoshan WU , Jun DU , Sheng XU , Xiaojun BAI , Guangsheng LUO Feng . Effects of ferrites on magnetic transport properties in La2/3Sr1/3MnO3/ferrites composites[J]. Acta Metallurgica Sinica (English Letters), 2009 , 22(1) : 51 -57 . DOI: 10.1016/S1006-7191(08)60070-8
[1]H.Y. Hwang, S.W. Cheong, P.G. Radaeli, M.Marezio and B. Batlogg, Phys Rev Lett 75(1995)914.
[2]Y. Tomika, T. Okuda, Y. Okimoto, A. Asamitsu, H. Kuwahara and Y. Tokura, J Alloy Compd 326(2001)27s.
[3]A. Urashibara, Y. Moritomo, T. Arima, A. Asamitsu, G.Kido and Y. Tokura, Phys Rev B 51(1995)14103.
[4]J. Fontcuberta, B. Martinez, A. Seffar, S. Pinol, J.L. Garcia-Munoz and X. Obradors, Phys Rev Lett 76(1996)1122.
[5]P. Schiffer, A.P. Ramirez, W. Bao and S.W. Cheong, Phys Rev Lett 75(1995)3336.
[6]C. Zener. Phys Rev 82 (1951) 403.
[7]H.Y. Hwang, SW. Cheong, N.P. Ong and B.Batlog, Phys Rev Lett 77(10)(1996)2041.
[8]M.Eshraghi, H. Salamati and P. Kameli, J Alloy Compd 437(2007)22.
[9]L.E. Hueso, J. Rivas, F. Rivadulla and M.A.Lopez-Quintela, J Non-crystalline Solid 287(2001)324.
[10]P. Kameli, H. Salamati, M. Eshraghi and M.R.Mohammadizadeh, J Appl Phys 98(2005)043908.
[11]O.A. Shlyakhtin, Y.J. Oh and Y.D. Tretyakov, Solid Stat Commun 117(2001)261.
[12]E. Bose, S. Taran, S. Karmakar,B.K. Chaudhuri, S. Pal, C.P. Sun and H.D. Yang, J Magn Magn Mater 314(2007)30.
[13]G.M. Ren, S.L. Yuan, H.G.Guan, X. Xiao, G.Q. Yu, J.H. Miao, Y.Q. Wang and S.Y. Yin, Mater Lett 61(2007)767.
[14]J.M. Liu, G.L. Yuan, H.Sang, Z.C. Wu, X.Y. Chen, Z.G. Liu, Y.W. Du, Q. Huang and C.K. Ong, Appl Phys Lett 78(2001)1110.
[15]Q. Huang, J.Li, X.J. Huang, C.K. Ong and X.S. Gao, J Appl Phys 90(2001)2924.
[16] B.B. Nayak, S. Vitta and D. Bahadur, Mater Sci Eng B 139(2007)171.
/
| 〈 |
|
〉 |
WeChat