Tunable room temperature low-field spin polarized tunneling magnetoresistance of La0.7Sr0.3MnO3 nanoparticles

2006 ◽  
Vol 89 (16) ◽  
pp. 163102 ◽  
Author(s):  
P. Dey ◽  
T. K. Nath
Keyword(s):  
Room Temperature ◽  
Tunneling Magnetoresistance ◽  
Low Field ◽  
Spin Polarized ◽  
Spin Polarized Tunneling

Fabrication and Properties of La-Manganite/SnO2 Composites

2010 ◽  
Vol 123-125 ◽  
pp. 81-84 ◽  
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.

Influence of Al2O3 on low-field spin-polarized tunneling magnetoresistance of (1−x) La0.7Ca0.3MnO3+x Al2O3 composites

2009 ◽  
Vol 63 (3-4) ◽  
pp. 353-356 ◽  
Author(s):  
P.T. Phong ◽  
N.V. Khiem ◽  
N.V. Dai ◽  
D.H. Manh ◽  
L.V. Hong ◽  
...  
Keyword(s):  
Tunneling Magnetoresistance ◽  
Low Field ◽  
Spin Polarized ◽  
Spin Polarized Tunneling

ELECTRICAL TRANSPORT AND LOW-FIELD MAGNETORESISTANCE IN La0.8Sr0.2MnO3/Zn COMPOSITES

2013 ◽  
Vol 27 (15) ◽  
pp. 1362012
Author(s):  
L. Q. YANG ◽  
X. S. YANG ◽  
L. LV ◽  
Y. ZHAO
Keyword(s):  
Grain Boundaries ◽  
Electrical Transport ◽  
Phase Structure ◽  
Low Field ◽  
Spin Polarized ◽  
Bonded Method ◽  
Tunneling Behavior ◽  
Spin Polarized Tunneling

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.

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

2009 ◽  
Vol 94 (21) ◽  
pp. 212107 ◽  
Author(s):  
M. Patra ◽  
A. Roy ◽  
K. De ◽  
S. Majumdar ◽  
S. Giri
Keyword(s):  
The Self ◽  
Tunneling Magnetoresistance ◽  
Spin Polarized ◽  
Spin Polarized Tunneling

Spin-polarized tunneling in room-temperature mesoscopic spin valves

2004 ◽  
Vol 85 (24) ◽  
pp. 5914-5916 ◽  
Author(s):  
S. O. Valenzuela ◽  
M. Tinkham
Keyword(s):  
Room Temperature ◽  
Spin Valves ◽  
Spin Polarized ◽  
Spin Polarized Tunneling

scholarly journals Магнитоотражение и эффект Керра в пленках La-=SUB=-2/3-=/SUB=-Ba-=SUB=-1/3-=/SUB=-MnO-=SUB=-3-=/SUB=- с вариантной структурой

2020 ◽  
Vol 128 (1) ◽  
pp. 43
Author(s):  
А.В. Телегин ◽  
В.А. Бессонова ◽  
Ю.П. Сухоруков ◽  
А.П. Носов ◽  
Е.А. Ганьшина
Keyword(s):  
Colossal Magnetoresistance ◽  
Room Temperature ◽  
Magnetic Ordering ◽  
Tunneling Magnetoresistance ◽  
Polarized Electrons ◽  
Structural Domains ◽  
Spin Polarized ◽  
Temperature Dependences ◽  
Variant Structure ◽  
Magnetorefractive Effect

A correlation was found between the magnetoreflection of natural light and tunneling magnetoresistance in La2 / 3Ba1 / 3MnO3 films with a variant structure grown on ZrO2 (Y2O3) substrates. It was shown that the magnetoreflection as well as the colossal magnetoresistance, is maximum in the region of magnetic ordering near room temperature (Tc ~ 295 K) of the films. The magnetoreflection spectra of a La2 / 3Ba1 / 3MnO3 film with the variant structure are formed by the same mechanisms as in the case of films without the variant structure and can be described in terms of the theory of the magnetorefractive effect. The field and temperature dependences of magnetoreflection demonstrate the presence of an additional low-temperature contribution to the reflection of the La2 / 3Ba1 / 3MnO3 film due to tunneling of spin-polarized electrons through the boundaries of structural domains.

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