Epitaxial films of exhibiting CMR prepared using nebulized spray pyrolysis

Raju, A. R.; Aiyer, Hemantkumar N.; Nagaraju, B.; Mahendiren, R.; Raychaudhuri, A. K.; Rao, C. N. R.

doi:10.1088/0022-3727/30/22/001

Cited by 14 publications

(7 citation statements)

References 16 publications

(16 reference statements)

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“…This behaviour is similar to that observed in the single-crystal La-manganites [10,17]. Large MRs over a wide range of temperature and at relatively small external magnetic fields have been observed in randomly oriented polycrystalline materials [18][19][20][21]. Wang et al [10] have shown that polycrystalline bulk LCMO exhibits MRs over a wide temperature range and they have attributed this to the presence of weak-link type grain boundaries.…”

Section: Introductionsupporting

confidence: 74%

Low-field magneto-resistance of spray pyrolysis deposited La_0.67Ca_0.33MnO₃thin films

Singh

Khare

Siwach

et al. 2000

J. Phys. D: Appl. Phys.

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The magnetoresistive behaviour of La 0.67 Ca 0.33 MnO 3 thin films deposited by ultrasonic spray pyrolysis on YSZ substrate has been investigated at low applied dc magnetic fields. The highest magneto-resistance ratio (MR) of −17.75% has been observed at 77 K for applied dc magnetic field, H dc = 3 kG. The variation of the MR with temperature has been investigated and it has been observed that at lower temperatures the increase in MR is very rapid. This MR-T behaviour shows that the magneto-resistance has its origin in the grain boundaries. The variation of the MR with H dc shows a faster increase in the MR at lower applied dc fields. Surface morphological explorations employing scanning electron microscopy show the presence of microcracks throughout the films surface and also that these films are micro-crystalline, having an average grain size of ∼125 nm.

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Section: Introductionsupporting

confidence: 74%

Low-field magneto-resistance of spray pyrolysis deposited La_0.67Ca_0.33MnO₃thin films

Singh

Khare

Siwach

et al. 2000

J. Phys. D: Appl. Phys.

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“…Several other studies [240][241][242][243][244][245][246][247][248][249] using polycrystalline films have probed the role of grain boundaries in samples consisting of multiple grains with different orientations over the measurement distance of the probe contacts, which gives only qualitative information because the total MR contribution is a complex convolution of the MR due to 'intrinsic' CMR contribution inside the grain and 'extrinsic' contribution coming from the GBs. Bicrystal substrates consisting of a single-grain boundary, with a well-defined misorientation between the grains, are ideal for the growth of films in order to isolate the contribution of a single-grain boundary.…”

Section: Magnetotransport In a Crystal Having Bicrystal Grain Boundarymentioning

confidence: 99%

“…Different techniques have been used to prepare polycrystalline films of La 1-x Ca x MnO 3 on different type of substrates. These include laser ablation [46,[232][233][234]248,250], chemical vapour deposition [246] and spray pyrolysis [249]. Of these techniques the last one, viz., spray pyrolysis is convenient and capable of producing films similar to those produced by more sophisticated techniques like laser ablation [46,[232][233][234]248,250].…”

Section: Studies On Polycrystalline La 067 Ca 033 Mno 3 (Lcmo) Filmsmentioning

confidence: 99%

“…Several other studies [386][387][388][389][390][391][392][393][394] using polycrystalline films have probed the role of grain boundaries in samples consisting of multiple grains with different orientations over the measurement distance of the probe contacts, which gives only qualitative information, because the total MR contribution is a complex convolution of the MR due to the 'intrinsic' CMR contribution inside the grain and the 'extrinsic' contribution coming from the GBs.…”

Section: Artificial Grain Boundaries Systemmentioning

confidence: 99%

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Low field magnetotransport in manganites

Siwach

Singh

Srivastava

2008

J. Phys.: Condens. Matter

226

128

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The perovskite manganites with generic formula RE(1-x)AE(x)MnO(3) (RE = rare earth, AE = Ca, Sr, Ba and Pb) have drawn considerable attention, especially following the discovery of colossal magnetoresistance (CMR). The most fundamental property of these materials is strong correlation between structure, transport and magnetic properties. They exhibit extraordinary large magnetoresistance named CMR in the vicinity of the insulator-metal/paramagnetic-ferromagnetic transition at relatively large applied magnetic fields. However, for applied aspects, occurrence of significant CMR at low applied magnetic fields would be required. This review consists of two sections: in the first section we have extensively reviewed the salient features, e.g. structure, phase diagram, double-exchange mechanism, Jahn-Teller effect, different types of ordering and phase separation of CMR manganites. The second is devoted to an overview of experimental results on CMR and related magnetotransport characteristics at low magnetic fields for various doped manganites having natural grain boundaries such as polycrystalline, nanocrystalline bulk and films, manganite-based composites and intrinsically layered manganites, and artificial grain boundaries such as bicrystal, step-edge and laser-patterned junctions. Some other potential magnetoresistive materials, e.g. pyrochlores, chalcogenides, ruthenates, diluted magnetic semiconductors, magnetic tunnel junctions, nanocontacts etc, are also briefly dealt with. The review concludes with an overview of grain-boundary-induced low field magnetotransport behavior and prospects for possible applications.

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“…From application point of view thin polycrystalline films having significant magneto-resistance at low magnetic field are important. The technique of spray pyrolysis has emerged as quite effective technique to grow good quality polycrystalline thin films having smaller particle size and infinite layer manganite thin films have been successfully deposited and have been found to exhibit significant magneto-resistance both at low as well as high magnetic fields [12][13][14]. In this paper we report the preparation, structural/micro-structural and magneto-transport characterization of La 1.4 Ca 1.6 Mn 2 O 7 polycrystalline films prepared by nebulized spray pyrolysis on single crystal LaAlO 3 substrates.…”

Section: Introductionmentioning

confidence: 99%

Magneto-transport characteristics of La_1.4Ca_1.6Mn₂O₇thin film deposited by spray pyrolysis

Siwach¹,

Singh²,

Srivastava³

2006

J. Phys. D: Appl. Phys.

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Polycrystalline thin films of double layer manganite La 1.4 Ca 1.6 Mn 2 O 7 (DLCMO) have been deposited by nebulized spray pyrolysis on single crystal LaAlO 3 substrates.These single phase films having grain size in the range 70-100 nm exhibit ferromagnetic transition at T C ~ 107 K. The short range ferromagnetic ordering due to the in plane spin coherence is evidenced to occur at a higher temperature around 225 K.Insulator/semiconductor to metal transition occurs at a lower temperature T P ~ 55 K. The transport mechanism above T C is of Mott's variable range hopping type. Below T C the current-voltage characteristics show non-linear behaviour that becomes stronger with decreasing temperature. At low temperatures below T CA ~ 30 K a magnetically frustrated spin canted state is observed. The DLCMO films exhibit reasonable low field magnetoresistance and at 77 K the magneto-resistance ratio is ~5 % at 0.6kOe and ~13 % at 3 kOe.

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Epitaxial films of exhibiting CMR prepared using nebulized spray pyrolysis

Cited by 14 publications

References 16 publications

Low-field magneto-resistance of spray pyrolysis deposited La_0.67Ca_0.33MnO₃thin films

Low-field magneto-resistance of spray pyrolysis deposited La_0.67Ca_0.33MnO₃thin films

Low field magnetotransport in manganites

Magneto-transport characteristics of La_1.4Ca_1.6Mn₂O₇thin film deposited by spray pyrolysis

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Epitaxial films of exhibiting CMR prepared using nebulized spray pyrolysis

Cited by 14 publications

References 16 publications

Low-field magneto-resistance of spray pyrolysis deposited La0.67Ca0.33MnO3thin films

Low-field magneto-resistance of spray pyrolysis deposited La0.67Ca0.33MnO3thin films

Low field magnetotransport in manganites

Magneto-transport characteristics of La1.4Ca1.6Mn2O7thin film deposited by spray pyrolysis

Contact Info

Product

Resources

About

Low-field magneto-resistance of spray pyrolysis deposited La_0.67Ca_0.33MnO₃thin films

Low-field magneto-resistance of spray pyrolysis deposited La_0.67Ca_0.33MnO₃thin films

Magneto-transport characteristics of La_1.4Ca_1.6Mn₂O₇thin film deposited by spray pyrolysis