Tunnelling magnetoresistance of double perovskite Sr2FeMoO6 enhanced by grain boundary adjustment

被引：36

作者：

Zhong, W ^{[1
]}

Liu, W

Au, CT

Du, YW

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[2] Hong Kong Baptist Univ, Dept Chem, Kowloon, Hong Kong, Peoples R China

[3] Hong Kong Baptist Univ, Ctr Surface Anal & Res, Kowloon, Hong Kong, Peoples R China

来源：

NANOTECHNOLOGY | 2006年 / 17卷 / 01期

关键词：

D O I：

10.1088/0957-4484/17/1/042

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Polycrystalline double perovskite Sr2FeMoO6 samples were synthesized by a wet chemistry method under controlled reduction conditions. Single-phase 'bulrush-like' samples of grain size about 110nm in width and > 2 mu m in length were readily obtained at temperatures as low as 950 degrees C, and they showed a large room-temperature tunnelling magnetoresistance (Delta rho/rho(0)) of -21% at a low magnetic field of 10 kOe. Utilizing the reactivity of Sr2FeMoO6 to water and a sonochemical technique, we manipulated the properties of grain boundary (GB) barriers, and managed to enhance the room-temperature tunnelling magnetoresistance to -35%. The magnitude of the low-field magnetoresistance appears to depend strongly on GB properties, and can be regulated by controlling the reaction time with water.

引用

页码：250 / 256

页数：7

共 35 条

[1]

Alonso JA, 2000, CHEM MATER, V12, P161, DOI 10.1021/cm990512g

[2] Phase diagram and influence of defects in the double perovskites -: art. no. 214423 [J].

Alonso, JL ;

Fernández, LA ;

Guinea, F ;

Lesmes, F ;

Martín-Mayor, V .

PHYSICAL REVIEW B, 2003, 67 (21)

[3] Cationic ordering control of magnetization in Sr2FeMoO6 double perovskite [J].

Balcells, L ;

Navarro, J ;

Bibes, M ;

Roig, A ;

Martínez, B ;

Fontcuberta, J .

APPLIED PHYSICS LETTERS, 2001, 78 (06) :781-783

[4] Chemical tuning of structure, magnetization, and conductivity in the self-doped double-perovskite (Sr2-xCax)FeMoO6 (0≤x≤2.0) system [J].

Chan, TS ;

Liu, RS ;

Guo, GY ;

Hu, SF ;

Lin, JG ;

Chen, JM ;

Attfield, JP .

CHEMISTRY OF MATERIALS, 2003, 15 (02) :425-432

[5] Structural phase transition and the electronic and magnetic properties of Sr2FeMoO6 [J].

Chmaissem, O ;

Kruk, R ;

Dabrowski, B ;

Brown, DE ;

Xiong, X ;

Kolesnik, S ;

Jorgensen, JD ;

Kimball, CW .

PHYSICAL REVIEW B, 2000, 62 (21) :14197-14206

[6] Magnetoresistance of chromium dioxide powder compacts [J].

Coey, JMD ;

Berkowitz, AE ;

Balcells, L ;

Putris, FF ;

Barry, A .

PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3815-3818

[7] Effect of band filling and structural distortions on the Curie temperature of Fe-Mo double perovskites -: art. no. 012412 [J].

Frontera, C ;

Rubi, D ;

Navarro, J ;

García-Muñoz, JL ;

Fontcuberta, J ;

Ritter, C .

PHYSICAL REVIEW B, 2003, 68 (01)

[8] Spin-polarized transport and magnetoresistance in magnetic oxides [J].

Gupta, A ;

Sun, JZ .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) :24-43

[9] Simple and efficient route to prepare homogeneous samples of Sr2FeMoO6 with a high degree of Fe/Mo order [J].

Huang, YH ;

Lindén, J ;

Yamauchi, H ;

Karppinen, M .

CHEMISTRY OF MATERIALS, 2004, 16 (22) :4337-4342

[10] Room-temperature magnetoresistance in an oxide material with an ordered double-perovskite structure [J].

Kobayashi, KL ;

Kimura, T ;

Sawada, H ;

Terakura, K ;

Tokura, Y .

NATURE, 1998, 395 (6703) :677-680

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