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SCIENCE CHINA Physics, Mechanics & Astronomy
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SCIENCE CHINA Physics, Mechanics & Astronomy, Volume 63 , Issue 3 : 237811(2020) https://doi.org/10.1007/s11433-019-1444-6

Spatial confinement tuning of quenched disorder effects and enhanced magnetoresistance in manganite nanowires

Yang Yu 1, Qiang Li 1, Qian Shi 1, YinYan Zhu 1, HanXuan Lin 1, Hao Liu 1, HongYan Chen 1, Tian Miao 1, Yu Bai 1, YanMei Wang 1, WenTing Yang 1, WenBin Wang 2, HangWen Guo 2,*, LiFeng Yin 1,2,3,*, Jian Shen 1,2,3,*
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  • ReceivedJul 19, 2019
  • AcceptedSep 11, 2019
  • PublishedOct 23, 2019
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Abstract


Funded by

the National Key Research and Development Program of China(Grant,No.,2016YFA0300702)

the Shanghai Municipal Natural Science Foundation(Grant,Nos.,18JC1411400,18ZR1403200,17ZR1442600)

the Program of Shanghai Academic Research Leader(Grant,Nos.,18XD1400600,17XD1400400)

and the China Postdoctoral Science Foundation(Grant,Nos.,2016M601488,2017T100265)


Acknowledgment

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300702), the Shanghai Municipal Natural Science Foundation (Grant Nos. 19ZR1402800, 18JC1411400, 18ZR1403200, and 17ZR1442600), the Program of Shanghai Academic Research Leader (Grant Nos. 18XD1400600, and 17XD1400400), and the China Postdoctoral Science Foundation (Grant Nos. 2016M601488, and 2017T100265). We are grateful for theoretical discussion from Shuai Dong and Jun Chen.


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    Figure 1

    Morphology of LPCMO nanowires. (a)-(h) SEM images of nanowires ranging from 5 μm to 50 nm in width.

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    Figure 2

    (Color online) Resistivity vs. temperature measurements of LPCMO nanowires. (a)-(h) The resistivity vs. temperature curves under cooling and warming. Black, red, green, blue, purple, and orange correspond to the different external magnetic fields applied, and being 0, 1, 2, 3, 5, and 9 T, respectively. (i) The resistivity of the 400 nm nanowire under cooling and warming conditions in a 2 T magnetic field exhibiting clear thermal hysteresis and resistivity jump behaviors. (j) The resistivity of the 50 nm nanowire under cooling and warming conditions in at 5 T magnetic field. No thermal hysteresis and resistivity jumps are observed. Blue and red in (i) and (j) correspond to cooling and warming processes, respectively.

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    Figure 3

    (Color online) Resistivity vs. external magnetic field behavior at different temperatures. (a)-(d) correspond to temperatures of 160, 110, 60, and 10 K. Black, red, blue, green, and purple correspond to different widths of nanowires, corresponding to 400, 300, 200, 100, and 50 nm, respectively.

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    Figure 4

    (Color online) Force microscopy measurements of selected nanowires under increasing magnetic field. (a) AFM image of the morphology of the selected nanowires (left to right: width=1 μm, 500 nm, 200 nm, and 100 nm). (b)-(h) MFM images of the four wires of differing widths in different applied magnetic fields. Red color refers to the FMM phase and blue color refers to the nonmagnetic phase.

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    Figure 5

    (Color online) Temperature-dependent magnetoresistance of differing-width nanowires. MR is defined as MR=(R0−RH)/RH, where RH was measured at 9 T, compared with R0, measured at zero magnetic field.