Colossal terahertz magnetoresistance at room temperature in epitaxial La0.7Sr0.3MnO3 nanocomposites and single-phase thin films

Lloyd-Hughes, James; Mosley, C. D. W.; Jones, S. P. P.; Lees, M. R.; Chen, Aiping; Jia, Quan Xi; Choi, E. -M.; MacManus-Driscoll, J. L.

doi:10.1021/acs.nanolett.7b00231

Title: Colossal terahertz magnetoresistance at room temperature in epitaxial La_0.7Sr_0.3MnO₃ nanocomposites and single-phase thin films

Journal Article · Mon Mar 13 00:00:00 EDT 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b00231· OSTI ID:1364556

^[1]; Mosley, C. D. W. ^[1]; Jones, S. P. P. ^[2]; Lees, M. R. ^[1];

^[3]; Jia, Quan Xi ^[4]; Choi, E. -M. ^[5]; MacManus-Driscoll, J. L. ^[5]

Univ. of Warwick, Coventry (United Kingdom)
Univ. of Oxford, Oxford (United Kingdom)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. at Buffalo, Buffalo, NY (United States)
Univ. of Cambridge, Cambridge (United Kingdom)

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_0.3MnO₃. 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 direct current (dc) CMR of the VAN is controlled by extrinsic magnetotransport mechanisms such as spin-polarized tunneling between nanograins. 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 alternating current motion on nanometer 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. As a result, 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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1364556

Report Number(s):: LA-UR-17-22535

Journal Information:: Nano Letters, Vol. 17, Issue 4; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface Chen, Aiping; Su, Qing; Han, Hyungkyu Advanced Materials, Vol. 31, Issue 4 https://doi.org/10.1002/adma.201803241	journal	October 2018
Interfacial polarizations induced by incorporating traditional perovskites into reduced graphene oxide (RGO) for strong microwave response Dai, Sisi; Quan, Bin; Zhang, Baoshan Dalton Transactions, Vol. 48, Issue 7 https://doi.org/10.1039/c8dt04966a	journal	January 2019
Broadband microwave absorber constructed by reduced graphene oxide/La _0.7 Sr _0.3 MnO ₃ composites Yan, Kelan; Yin, Feng; Pang, Chao RSC Advances, Vol. 9, Issue 71 https://doi.org/10.1039/c9ra09474a	journal	January 2019

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Title: Colossal terahertz magnetoresistance at room temperature in epitaxial La_0.7Sr_0.3MnO₃ nanocomposites and single-phase thin films