Enhanced tunable magnetoresistance properties over a wide temperature range in epitaxial (La{sub 0.7}Sr{sub 0.3}MnO{sub 3}){sub 1−x}:(CeO{sub 2}){sub x} nanocomposites

Journal Article · Fri Aug 14 04:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4928160· OSTI ID:22494735

Fan, Meng; Khatkhatay, Fauzia ^[1]; Zhang, Wenrui; Li, Leigang ^[2]; Wang, Haiyan ^[1]

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1. Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843 (United States)
2. Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843 (United States)

Vertically aligned nanocomposite (VAN) (La{sub 0.7}Sr{sub 0.3}MnO{sub 3}){sub 1−x}:(CeO{sub 2}){sub x} (LSMO:CeO{sub 2}) thin films have been grown on SrTiO{sub 3} (001) substrates by pulsed laser deposition. Tunable magnetoresistance properties as well as microstructures are demonstrated in these VAN films by modulating the film composition (x = 0, 0.3, 0.4, 0.45, 0.5, and 0.55). The sample of x = 0.3 shows a large low-field magnetoresistance (LFMR) in a high temperature range, i.e., over 10% at the range of 280 K to 320 K under 1 T and with a peak value of ∼13.5% at 310 K. In addition, a vast enhancement of LFMR in a low temperature range of 20–150 K with peak of ≈34.3% at 45 K for 1 T could be achieved with x = 0.5. The enhanced LFMR properties can be attributed to both the phase boundary induced spin fluctuation and the magnetic tunneling effect through vertical ferromagnetic/insulator/ferromagnetic structures. The observed enhanced LFMR performance, especially at high temperatures, as well as its simple growth method, offers a great potential for LSMO:CeO{sub 2}nanocomposites to be used in spintronic devices in a large temperature range.

• OSTI ID: 22494735
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 6 Vol. 118; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CERIUM OXIDES
ENERGY BEAM DEPOSITION
EPITAXY
LANTHANUM COMPOUNDS
LASER RADIATION
MAGNETORESISTANCE
MICROSTRUCTURE
NANOCOMPOSITES
PULSED IRRADIATION
SPIN
STRONTIUM TITANATES
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0400-1000 K
THIN FILMS
TUNNEL EFFECT