Large magnetoresistance of thick polymer devices having La0.67 Sr0.33 MnO3 electrodes

A. Ozbay; E. R. Nowak; Z. G. Yu; W. Chu; Yijian Shi; S. Krishnamurthy; Z. Tang; Nathan Newman

doi:10.1063/1.3271772

Large magnetoresistance of thick polymer devices having La_0.67 Sr_0.33 MnO₃ electrodes

A. Ozbay, E. R. Nowak, Z. G. Yu, W. Chu, Yijian Shi, S. Krishnamurthy, Z. Tang, Nathan Newman

Research output: Contribution to journal › Article

21 Scopus citations

Abstract

We report magnetoresistance (MR) measurements for structures with micrometer-thick regioregular, polythiophene (rr-P3HT) polymer layers between two ferromagnetic contacts. Hole spin transport through the polymer layer leads to a relative MR value in 300 mT fields of 0.3% at 300 K and increasing to 18% at 25 K. The inferred intrinsic spin lifetime and diffusion length are about 7 ms and 0.4 μm, respectively. The spin transport coherence length is enhanced by the electric field, leading to an enhancement in MR with increasing applied voltage.

Original language	English (US)
Article number	232507
Journal	Applied Physics Letters
Volume	95
Issue number	23
DOIs	https://doi.org/10.1063/1.3271772
State	Published - Dec 18 2009

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3271772

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Ozbay, A., Nowak, E. R., Yu, Z. G., Chu, W., Shi, Y., Krishnamurthy, S., Tang, Z., & Newman, N. (2009). Large magnetoresistance of thick polymer devices having La_0.67 Sr_0.33 MnO₃ electrodes. Applied Physics Letters, 95(23), [232507]. https://doi.org/10.1063/1.3271772

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AU - Ozbay, A.

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AU - Chu, W.

AU - Shi, Yijian

AU - Krishnamurthy, S.

AU - Tang, Z.

AU - Newman, Nathan

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AB - We report magnetoresistance (MR) measurements for structures with micrometer-thick regioregular, polythiophene (rr-P3HT) polymer layers between two ferromagnetic contacts. Hole spin transport through the polymer layer leads to a relative MR value in 300 mT fields of 0.3% at 300 K and increasing to 18% at 25 K. The inferred intrinsic spin lifetime and diffusion length are about 7 ms and 0.4 μm, respectively. The spin transport coherence length is enhanced by the electric field, leading to an enhancement in MR with increasing applied voltage.

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