The Library
Colossal terahertz magnetoresistance at room temperature in epitaxial La0.7Sr0.3MnO3 nanocomposites and single-phase thin films
Tools
Lloyd-Hughes, James, Mosley, C. D. W., Jones, S. P. P., Lees, Martin R., Chen, A., Jia, Q. X., Choi, E. M. and MacManus-Driscoll, J. L. (2017) Colossal terahertz magnetoresistance at room temperature in epitaxial La0.7Sr0.3MnO3 nanocomposites and single-phase thin films. Nano Letters, 17 (4). pp. 2506-2511. doi:10.1021/acs.nanolett.7b00231 ISSN 1530-6984.
|
PDF
WRAP_paperNL-revised.pdf - Accepted Version - Requires a PDF viewer. Download (1924Kb) | Preview |
Official URL: http://doi.org/10.1021/acs.nanolett.7b00231
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: | Journal Article | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Magnetoresistance, Terahertz spectroscopy, Nanocomposites (Materials), Thin films | ||||||||||||
Journal or Publication Title: | Nano Letters | ||||||||||||
Publisher: | American Chemical Society | ||||||||||||
ISSN: | 1530-6984 | ||||||||||||
Official Date: | 13 March 2017 | ||||||||||||
Dates: |
|
||||||||||||
Volume: | 17 | ||||||||||||
Number: | 4 | ||||||||||||
Page Range: | pp. 2506-2511 | ||||||||||||
DOI: | 10.1021/acs.nanolett.7b00231 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 16 March 2017 | ||||||||||||
Date of first compliant Open Access: | 13 March 2018 | ||||||||||||
RIOXX Funder/Project Grant: |
|
||||||||||||
Related URLs: |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year