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Title: Tailoring transport properties of phase-separated manganite films with ordered magnetic nanostructures

Abstract

Here, the magnetotransport properties of thin manganite films (La 0.7Ca 0.3MnO 3) coupled with arrays of permalloy (Py) nanodots deposited on the surface of the film are studied as a function of temperature, magnetic field, and the size of the dots. In the presence of the magnetic dots, a reduction of the electrical resistivity is observed, especially at the insulator-to-metal transition, as well as a shift of the transition peak towards higher temperatures. This indicates that, due to local interface exchange coupling, highly conductive ferromagnetic domains are nucleated in the manganite film underneath the Py nanodots. The use of a simplified resistor network model allows us to estimate the size of the metallic regions induced by exchange coupling. At low temperatures, these regions extend ~70 nm beyond the edge of the nanodots, a length scale comparable to the correlation length of the ferromagnetic clusters in the phase-separated state of La 0.7Ca 0.3MnO 3.

Authors:
 [1];  [1];  [2];  [3];  [1]
  1. Univ. San Francisco de Quito, Quito (Ecuador)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Harvard Univ., Cambridge, MA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1331001
Alternate Identifier(s):
OSTI ID: 1280210; OSTI ID: 1352890
Grant/Contract Number:  
AC02-06CH11357; 08-146 RG/PHYS/LA
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Vlaminck, V., Yanez, W., Hoffman, J., Hoffmann, A., and Niebieskikwiat, D.. Tailoring transport properties of phase-separated manganite films with ordered magnetic nanostructures. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.064404.
Vlaminck, V., Yanez, W., Hoffman, J., Hoffmann, A., & Niebieskikwiat, D.. Tailoring transport properties of phase-separated manganite films with ordered magnetic nanostructures. United States. doi:10.1103/PhysRevB.94.064404.
Vlaminck, V., Yanez, W., Hoffman, J., Hoffmann, A., and Niebieskikwiat, D.. Tue . "Tailoring transport properties of phase-separated manganite films with ordered magnetic nanostructures". United States. doi:10.1103/PhysRevB.94.064404. https://www.osti.gov/servlets/purl/1331001.
@article{osti_1331001,
title = {Tailoring transport properties of phase-separated manganite films with ordered magnetic nanostructures},
author = {Vlaminck, V. and Yanez, W. and Hoffman, J. and Hoffmann, A. and Niebieskikwiat, D.},
abstractNote = {Here, the magnetotransport properties of thin manganite films (La0.7Ca0.3MnO3) coupled with arrays of permalloy (Py) nanodots deposited on the surface of the film are studied as a function of temperature, magnetic field, and the size of the dots. In the presence of the magnetic dots, a reduction of the electrical resistivity is observed, especially at the insulator-to-metal transition, as well as a shift of the transition peak towards higher temperatures. This indicates that, due to local interface exchange coupling, highly conductive ferromagnetic domains are nucleated in the manganite film underneath the Py nanodots. The use of a simplified resistor network model allows us to estimate the size of the metallic regions induced by exchange coupling. At low temperatures, these regions extend ~70 nm beyond the edge of the nanodots, a length scale comparable to the correlation length of the ferromagnetic clusters in the phase-separated state of La0.7Ca0.3MnO3.},
doi = {10.1103/PhysRevB.94.064404},
journal = {Physical Review B},
number = 6,
volume = 94,
place = {United States},
year = {Tue Aug 02 00:00:00 EDT 2016},
month = {Tue Aug 02 00:00:00 EDT 2016}
}

Journal Article:
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