Magnetoresistance in polymer-assisted deposited Sr- and Ca-doped lanthanum manganite films

Jain, M.; Li, Y.; Hundley, M. F.; Hawley, M. E.; Maiorov, B.; Campbell, I. H.; Civale, L.; Jia, Q. X.; Shukla, Piyush; Burrell, Anthony K.; McCleskey, T. Mark

doi:10.1063/1.2207497

Cited by 33 publications

(34 citation statements)

References 23 publications

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“…These results support our XRD analysis where a single and asymmetric (002) peak was observed. The temperature at which the maximum resistivity occurs, T p , of the ML1 and ML2 films is closer to that of the pure LSMO film, [12] which could be because of the presence of LSMO as the top layer or the larger LSMO/LCMO volume ratio. The T p for the films coincides well with the Curie temperature (T c ) for the films, which shows the resistivity-magnetization correlation in these films.…”

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“…PAD is a solution technique that has been successfully used to prepare both simple and complex metal oxide films. [11,12] The LSMO and LCMO compounds have similar lattice parameters and have a Curie temperature above and below room temperature, respectively, which makes them very attractive for preparing multilayers. The PAD technique was used to prepare the solutions of La 0.67 Sr 0.33 Mn and La 0.67 Ca 0.33 Mn.…”

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“…The observed activation energies of single-phase LCMO and LSMO films are typically in the range of 70-150 meV. [12,15] The MR values for the films were calculated from the resistivities at zero field and at different applied magnetic fields. At a low field of 0.5 T, multilayer-coated films ML1 and ML2 showed MR values of -4 % and -15.5 %, respectively, at 300 K. The MR values at an applied field of 5 T for all the films are plotted as a function of temperature in Figure 4b.…”

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Manipulating Magnetoresistance Near Room Temperature in La_0.67Sr_0.33MnO₃/La_0.67Ca_0.33MnO₃ Films Prepared by Polymer Assisted Deposition

Jain

Shukla

et al. 2006

Advanced Materials

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Doped manganites, RE 1-x A x MnO 3 (RE = rare-earth and A= alkaline-earth elements), have attracted much attention because of their potential applications in magnetic sensors and other devices. [1][2][3][4][5] A prominent feature of these materials is a metallic-insulating (MI) transition associated with the ferromagnetic-paramagnetic (FM-PM) transition.[4] The figure of merit of these colossal magnetoresistance (CMR) materials for many applications is the magnetoresistance (MR = (q Hq 0 )/q 0 , where q H and q 0 are the resistivities with and without a magnetic field, respectively). For practical applications, it is important to obtain a high MR at room temperature and at low magnetic fields. It has been observed that the MR near or at the transition temperature, T c , for a given field strength, is generally larger for samples with lower T c .[2] Thus, simply changing the composition of these manganites is not effective in obtaining large MR values near room temperature. Many recent efforts in searching for enhanced MR have been focused on transport properties across artificial grain boundaries and interfaces by making FM manganite/spacer superlattices and FM-insulator-FM tunneling junctions. [6][7][8] However, the enhancements of the MR were mostly achieved at low temperatures (< 150 K). [5]In this work, we report our efforts to obtain a large MR near room temperature by preparing multilayer-coated La 0.67 Sr 0.33 MnO 3 /La 0.67 Ca 0.33 MnO 3 (LSMO/LCMO) films using polymer assisted deposition (PAD). PAD is a solution technique that has been successfully used to prepare both simple and complex metal oxide films. [11,12] The LSMO and LCMO compounds have similar lattice parameters and have a Curie temperature above and below room temperature, respectively, which makes them very attractive for preparing multilayers. The PAD technique was used to prepare the solutions of La 0.67 Sr 0.33 Mn and La 0.67 Ca 0.33 Mn. These solutions were spincoated onto single-crystalline (001) LaAlO 3 (LAO) substrates. After each coating, the films were heated at 600°C for 5 min. For all the films, a total of 10 coatings were applied on the substrate and final annealing was performed at 950°C for 2 h in oxygen. The thicknesses of the films were ca. 130 nm. Our initial study focused on optimizing the LSMO/LCMO ratio to get a maximum MR close to room temperature. The films with LSMO/LCMO volume ratios of 70:30, 60:40, and 50:50 had MR values of -61 %, -63 %, and -57 %, respectively, at 300 K at an applied field of 5 T. Hence, in this work we prepared multilayer-coated films by holding the LSMO/ LCMO volume ratio constant (60:40 with maximum MR) and changing the number and the thickness of the individual layers. Details of the layered configuration with their sample identifications (ML1 and ML2) are illustrated in Figure 1. To make a direct comparison of the multilayer-coated films, a single-phase film of La 0.67 Sr 0.198 Ca 0.132 MnO 3 (LSCMO), which is a uniformly mixed phase of the LSMO/LCMO at a volume ratio of 60:40, was also prepa...

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Manipulating Magnetoresistance Near Room Temperature in La_0.67Sr_0.33MnO₃/La_0.67Ca_0.33MnO₃ Films Prepared by Polymer Assisted Deposition

Jain

Shukla

et al. 2006

Advanced Materials

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“…Deposition of ultra thin films of (La, Sr)MnO 3 on (001) LaAlO 3 substrate and the study of thicknessdependent resistance show that the thickness of dead layer is 15Å [6]. Effect of post annealing temperature on electrical, magnetic and magnetoresistance properties of Sr-and Ca-doped lanthanum manganites films has been studied by Jain et al [7]. Nd 0.7 Sr 0.3 MnO 3 (NSMO) film is useful for bolometric application due to its large temperature coefficient of resistance [8].…”

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Effect of Post Annealing Process on Electrical and Magnetic Properties of Nd0.7Sr0.3MnO3 Thin Films

Gopalarao

Ravi

Pamu

2014

J Supercond Nov Magn

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Nd 0.7 Sr 0.3 MnO 3 thin films were deposited on (001) Al 2 O 3 substrate by using rf-magnetron sputtering unit. The effect of post-annealing on the structural, electrical and magnetic properties are studied. These films exhibit orthorhombic structure and the compressive strain is found to decrease with increase in annealing temperature. Raman studies at room temperature show four well-resolved Raman peaks due to two A g , B 2g and B 3g modes. One of the Raman lines is found to be sensitive to lattice strain and it disappears upon annealing the film at 900 • C. All the annealed films show double exchange ferromagnetic transition and the transition temperature increases upon increase in annealing temperature due to the reduced lattice strain and the improved oxygen stoichiometry. These films show metalinsulator transition and the resistivity data in the metallic region could be fitted to the empirical relation ρ = ρ 0 + ρ 2.5 T 2.5 while the resistivity in the semiconducting region could be fitted to variable range hopping model.

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“…However, these advantages are nullified by the low critical thickness (the maximum thickness achieved without crack formation via non-repetitive) and the loss of control over stoichiometry. In present work, we choose a polymer assisted deposition (PAD) method to obtain epitaxial thin film, which is based on a surfactant assisted sol-gel method [30][31][32][33][34]. The major distinction between the PAD method and the existing solgel process lies in the functionality of the soluble polyethyleneimine (PEI) used in the solution.…”

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Structural characteristics, magnetic properties of Re2NiMnO6 (Re=La, Pr, Nd, Sm, Y) thin films on (001) LaAlO3 by simple polymer assisted deposition

Xie

Shi

Zhou

et al. 2015

Surface and Coatings Technology

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Magnetoresistance in polymer-assisted deposited Sr- and Ca-doped lanthanum manganite films

Cited by 33 publications

References 23 publications

Manipulating Magnetoresistance Near Room Temperature in La_0.67Sr_0.33MnO₃/La_0.67Ca_0.33MnO₃ Films Prepared by Polymer Assisted Deposition

Manipulating Magnetoresistance Near Room Temperature in La_0.67Sr_0.33MnO₃/La_0.67Ca_0.33MnO₃ Films Prepared by Polymer Assisted Deposition

Effect of Post Annealing Process on Electrical and Magnetic Properties of Nd0.7Sr0.3MnO3 Thin Films

Structural characteristics, magnetic properties of Re2NiMnO6 (Re=La, Pr, Nd, Sm, Y) thin films on (001) LaAlO3 by simple polymer assisted deposition

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Magnetoresistance in polymer-assisted deposited Sr- and Ca-doped lanthanum manganite films

Cited by 33 publications

References 23 publications

Manipulating Magnetoresistance Near Room Temperature in La0.67Sr0.33MnO3/La0.67Ca0.33MnO3 Films Prepared by Polymer Assisted Deposition

Manipulating Magnetoresistance Near Room Temperature in La0.67Sr0.33MnO3/La0.67Ca0.33MnO3 Films Prepared by Polymer Assisted Deposition

Effect of Post Annealing Process on Electrical and Magnetic Properties of Nd0.7Sr0.3MnO3 Thin Films

Structural characteristics, magnetic properties of Re2NiMnO6 (Re=La, Pr, Nd, Sm, Y) thin films on (001) LaAlO3 by simple polymer assisted deposition

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Manipulating Magnetoresistance Near Room Temperature in La_0.67Sr_0.33MnO₃/La_0.67Ca_0.33MnO₃ Films Prepared by Polymer Assisted Deposition

Manipulating Magnetoresistance Near Room Temperature in La_0.67Sr_0.33MnO₃/La_0.67Ca_0.33MnO₃ Films Prepared by Polymer Assisted Deposition