Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/97039
Title: Large intragranular low field magnetoresistance in polycrystalline S2Fe1-xAlxMoO6 compounds
Authors: Wang, X.-J.
Sui, Y.
Qian, Z.-N.
Cheng, J.-G.
Liu, Z.-G.
Li, Y.
Su, W.-H.
Ong, C.K. 
Keywords: Doping, spin-polarized electron
Low-field magnetoresisitance
Issue Date: Feb-2005
Source: Wang, X.-J.,Sui, Y.,Qian, Z.-N.,Cheng, J.-G.,Liu, Z.-G.,Li, Y.,Su, W.-H.,Ong, C.K. (2005-02). Large intragranular low field magnetoresistance in polycrystalline S2Fe1-xAlxMoO6 compounds. Wuli Xuebao/Acta Physica Sinica 54 (2) : 907-911. ScholarBank@NUS Repository.
Abstract: Polycrystalline powders of the family of compounds Sr2Fe1-xAlxMoO6 (x = 0, 0.05, 0.10, 0.15, 0.30) were prepared according to the standard solid-state reaction . XRD patterns and SEM images show that the structure and the grain size of these compounds were not changed and no impurity was observed by doping with Al in Sr2 FeMoO6. In the cationic ordered segregation, a large ferrimagnetic patch can be separated into some smaller ones by the Al doping. So the chain of the ferrimagnetic exchange path will be shortened and the strength of exchange will be weakened. Therefore, their moments become more sensitive to external field. Furthermore, when the Al ion replaces the Fe ion in the disordered segregation, the antiferromagnetic coupling becomes weaker. As a result, the low-field magnetoresistance is enhanced. But the smaller ferrimagnetic segregates become more sensitive to thermal agitation at high temperatures. The weakness of the Al-doped SFMO lies in its stronger temperature dependence of the saturated moments and the low-field magnetoresistance.
Source Title: Wuli Xuebao/Acta Physica Sinica
URI: http://scholarbank.nus.edu.sg/handle/10635/97039
ISSN: 10003290
Appears in Collections:Staff Publications

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