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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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
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:	Department of Physics, University of Warwick
Official Date:	16 March 2017
Dates:	Date Event 14 March 2017 Accepted 16 March 2017 Published
Status:	Not Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Copyright Holders:	University of Warwick
Description:	figure1(c)-FC figure1(c)-FC-magnetisation-v-temperature figure1(c)-ZFC figure1(c)-ZFC, figure1(c)-ZFC-magnetisation-v-temperature figure2(a)-sigma1-v-frequency figure2(b)-dc-rho(10K)-rho(T)-v-temperature figure2(b)-sigma0-v-temperature figure3-(a)-VAN-sigma1-v-freq-at-B=0T-and-B=4T-T50K figure3-(b)-VAN-sigma1-v-freq-at-B=0T-T200K figure3-(b)-VAN-sigma1-v-freq-at-B=2T-T200K figure3-(b)-VAN-sigma1-v-freq-at-B=4T-T200K figure3-(b)-VAN-sigma1-v-freq-at-B=6T-T200K figure3-(b)-VAN-sigma1-v-freq-at-B=6T-T200K figure3-(b)-VAN-sigma1-v-freq-at-B=6T-T200K figure3-(c)-VAN-sigma1-v-freq-at-B=2T-T300K figure3-(c)-VAN-sigma1-v-freq-at-B=4T-T300K figure3-(c)-VAN-sigma1-v-freq-at-B=6T-T300K figure3-(c)-VAN-sigma1-v-freq-at-B=8T-T300K figure3-(d)-LSMO-sigma1-v-freq-at-B=0T-T300K figure3-(d)-LSMO-sigma1-v-freq-at-B=2T-T300K figure3-(d)-LSMO-sigma1-v-freq-at-B=4T-T300K figure3-(d)-LSMO-sigma1-v-freq-at-B=6T-T300K figure3-(d)-LSMO-sigma1-v-freq-at-B=8T-T300K
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/H003444/2 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 UNSPECIFIED National Aeronautics and Space Administration http://dx.doi.org/10.13039/100000104 UNSPECIFIED Office of Science http://dx.doi.org/10.13039/100006132
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