Effect of nanosize modulation of granular La0.67Sr0.33MnO3 manganites on temperature-dependent low-field spin-polarized tunneling magnetoresistance

La 0.8 Sr 0.2 MnO 3 (LSMO)/ Zn composites were prepared by bonded method. The phase structure, electrical transport and low-field magnetoresistance (LFMR) characteristics have been investigated. The binder segregated mostly at the grain boundaries. The bonded composites exhibited enhanced LFMR, which was attributed to the enhanced intergrain spin-polarized tunneling behavior.

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Fabrication and Properties of La-Manganite/SnO2 Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.123-125.81 ◽

2010 ◽

Vol 123-125 ◽

pp. 81-84 ◽

Cited By ~ 1

Author(s):

Geun Woo Kim ◽

Yong Jun Seo ◽

Jin Long Bian ◽

Chan Gyu Lee ◽

Bon Heun Koo

Keyword(s):

Room Temperature ◽

X Ray Diffraction ◽

Scanning Electronic Microscopy ◽

Electronic Microscopy ◽

X Ray ◽

Structure And Morphology ◽

Low Field ◽

Spin Polarized ◽

Mr Effect ◽

Spin Polarized Tunneling

Composites with compositions La0.7Ca0.3MnO3(LCMO) and La0.7Sr0.3MnO3(LSMO)/SnO2 were prepared by a standard ceramic technique. The structure and morphology of the composites have been studied by the X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The XRD and SEM results indicate that no reaction occurs between La based maganite and SnO2 grains, and that SnO2 segregates mostly at the grain boundaries of La based maganite. The variation in resistivity with temperature has been studied and shows a semiconducting behavior, furthermore the composites exhibit metallic percolation. It is interesting to note that an enhanced magnetoresisitance (MR) effect for the composites is found over a wide temperature range from low temperature to room temperature in an applied magnetic field of 0.5 Tesla. The spin-polarized tunneling and the spin-polarized tunneling may be attributed to the enhanced low-field magnetoresistance (LFMR) effect.

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Tunneling magnetoresistance spectroscopy: Temperature dependent spin-polarized band structure inCu38Ni62

Physical Review B ◽

10.1103/physrevb.72.060406 ◽

2005 ◽

Vol 72 (6) ◽

Cited By ~ 10

Author(s):

A. T. Hindmarch ◽

C. H. Marrows ◽

B. J. Hickey

Keyword(s):

Band Structure ◽

Tunneling Magnetoresistance ◽

Temperature Dependent ◽

Spin Polarized

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Spin polarized tunneling magnetoresistance in the self-doped manganite La0.9MnO3

Applied Physics Letters ◽

10.1063/1.3147873 ◽

2009 ◽

Vol 94 (21) ◽

pp. 212107 ◽

Cited By ~ 9

Author(s):

M. Patra ◽

A. Roy ◽

K. De ◽

S. Majumdar ◽

S. Giri

Keyword(s):

The Self ◽

Tunneling Magnetoresistance ◽

Spin Polarized ◽

Spin Polarized Tunneling

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Low-field magnetoresistance in oxygen-deficient La0.5Sr0.5MnO3 thin films as approached by spin-polarized tunneling model

Materials Letters ◽

10.1016/s0167-577x(01)00457-8 ◽

2002 ◽

Vol 53 (1-2) ◽

pp. 76-82 ◽

Cited By ~ 10

Author(s):

G.L. Yuan ◽

J.-M. Liu ◽

H.L.W. Chan ◽

C.L. Choy ◽

C.K. Ong ◽

...

Keyword(s):

Thin Films ◽

Tunneling Model ◽

Low Field ◽

Spin Polarized ◽

Spin Polarized Tunneling

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Spin-polarized tunneling through a ferromagnetic insulator

Journal of Applied Physics ◽

10.1063/1.3068643 ◽

2009 ◽

Vol 105 (7) ◽

pp. 07C919

Author(s):

M. Kok ◽

J. N. Beukers ◽

A. Brinkman

Keyword(s):

Spin Polarized ◽

Spin Polarized Tunneling

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Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH3NH3PbI3 Crystals

Materials ◽

10.3390/ma14154215 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4215

Author(s):

Roxana E. Patru ◽

Hamidreza Khassaf ◽

Iuliana Pasuk ◽

Mihaela Botea ◽

Lucian Trupina ◽

...

Keyword(s):

Dielectric Properties ◽

Current Knowledge ◽

Cubic Phase ◽

Relaxation Processes ◽

Temperature Dependent ◽

Thermally Activated ◽

Low Field ◽

Conduction Mechanisms ◽

Temperature Ranges ◽

Nyquist Plots

The frequency and temperature dependence of dielectric properties of CH3NH3PbI3 (MAPI) crystals have been studied and analyzed in connection with temperature-dependent structural studies. The obtained results bring arguments for the existence of ferroelectricity and aim to complete the current knowledge on the thermally activated conduction mechanisms, in dark equilibrium and in the presence of a small external a.c. electric field. The study correlates the frequency-dispersive dielectric spectra with the conduction mechanisms and their relaxation processes, as well as with the different transport regimes indicated by the Nyquist plots. The different energy barriers revealed by the impedance spectroscopy highlight the dominant transport mechanisms in different frequency and temperature ranges, being associated with the bulk of the grains, their boundaries, and/or the electrodes’ interfaces.

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