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Data for Colossal terahertz magnetoresistance at room temperature in epitaxial La0.7Sr0.3MnO3 nanocomposites and single-phase thin films
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Lloyd-Hughes, James, Mosley, C. D. W., Jones, SPP, Lees, Martin R., Chen, A., Jia, Q. X., Choi, E. M. and MacManus-Driscoll, J. L. (2017) Data for Colossal terahertz magnetoresistance at room temperature in epitaxial La0.7Sr0.3MnO3 nanocomposites and single-phase thin films. [Dataset]
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Data deposit - Lloyd-Hughes Nano Letters 2017.zip - Unspecified Version Available under License Creative Commons Attribution 4.0. Download (198Kb) |
Official URL: http://wrap.warwick.ac.uk/86994
Abstract
Colossal magnetoresistance (CMR) is demonstrated at terahertz (THz) frequencies by using terahertz time-domain magnetospectroscopy to examine vertically-aligned nanocomposites (VANs) and planar thin films of La_0.7Sr_0.3MnO_3. At the Curie temperature (room temperature) the THz conductivity of the VAN was dramatically enhanced by over 2 orders of magnitude under the application of a magnetic field, with a non-Drude THz conductivity that increased with frequency. The dc CMR of the VAN is controlled by extrinsic magnetotransport mechanisms such as spin-polarized tunneling between nano-grains. In contrast, we find that THz CMR is dominated by intrinsic, intragrain transport: the mean free path was smaller than the nanocolumn size, and the planar thin-film exhibited similar THz CMR to the VAN. Surprisingly, the observed colossal THz magnetoresistance suggests that the magnetoresistance can be large for ac motion on nanometre length scales, even when the magnetoresistance is negligible on the macroscopic length scales probed by dc transport. This suggests that colossal magnetoresistance at THz frequencies may find use in nanoelectronics and in THz optical components controlled by magnetic fields. The VAN can be scaled in thickness while retaining a high structural quality, and offers a larger THz CMR at room temperature than the planar film.
Item Type: | Dataset | ||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Type of Data: | Plain text | ||||||||||||
Library of Congress Subject Headings (LCSH): | Magnetoresistance, Terahertz spectroscopy, Nanocomposites (Materials), Thin films | ||||||||||||
Publisher: | University of Warwick, Department of Physics | ||||||||||||
Official Date: | 16 March 2017 | ||||||||||||
Dates: |
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Status: | Not Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Media of Output (format): | .txt | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Copyright Holders: | University of Warwick | ||||||||||||
Description: | figure1(c)-FC |
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RIOXX Funder/Project Grant: |
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