Enhancement of the low-field magnetoresistance of La1−x−yCaxSryMnO3+d at room temperature

2001 ◽  
Vol 89 (2) ◽  
pp. 1271-1274 ◽  
Author(s):  
S. Kolesnik ◽  
B. Dabrowski ◽  
Z. Bukowski ◽  
J. Mais
Keyword(s):  
Room Temperature ◽  
Low Field

Room-temperature and low-field magnetoresistance of La-Sr-Mn-O thin films

1999 ◽  
Vol 35 (5) ◽  
pp. 2844-2846 ◽  
Author(s):  
Kyung-Ku Choi ◽  
T. Taniyama ◽  
Y. Yamazaki
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Low Field

Magnetoresistance and Structure of Granular Co/Ag Thin Films

1993 ◽  
Vol 313 ◽  
Author(s):  
Mary Beth Stearns ◽  
Yuanda Cheng
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Room Temperature ◽  
Magnetization Measurements ◽  
X Ray ◽  
Conduction Electrons ◽  
Low Field ◽  
Co Concentration ◽  
Microscopy Techniques ◽  
Substrate Temperatures

ABSTRACTSeveral series of CoxAg1-x granular thin films (-3000Å) were fabricated by coevapora-tion of Co and Ag in a dual e-beam UHV deposition system at varying substrate temperatures. These films have low field magnetoresistance values as large as 31% at room temperature and 65% at liquid N2 temperature. The structure of the films was determined using magnetization measurements as well as x-ray and various electron microscopy techniques. The composition was determined using Rutherford backscattering spectroscopy. The Magnetoresistance was measured at both room and liquid N2 temperatures.We deduce from the magnetization and RBS Measurements that the films consist of Co globules embedded in a Ag Matrix and that there is no appreciable mixing of the Co and Ag atoms in the films deposited at substrate temperatures ≥ 400°K. The size of the Co globules is seen to increase with increasing Co concentration and the maximum magnetoresistance occurs in those films having the smallest Ag thickness which provides magnetic isolation of the Co globules.We suggest that the large magnetoresistance of these films arises from the same mechanism which causes the low field magnetoresistance in pure ferromagnets, namely, the scattering of the highly polarized d conduction electrons of the Co at magnetic boundaries. The large increase in the room temperature magnetoresistance of the CO/Ag films as compared to those of pure 3d ferromagnetic films is due to the distance between the magnetic boundaries being reduced to a few nanometers, because of the small size of the single domain Co globules, as compared to a few microns in 3d ferromagnets.

Enhancing low-field magnetoresistance in magnetite nanoparticles via zinc substitution

2018 ◽  
Vol 20 (25) ◽  
pp. 17245-17252 ◽  
Author(s):  
Tao Wang ◽  
Zhong-Zhi Luan ◽  
Jing-Yuan Ge ◽  
Ling Liu ◽  
Di Wu ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Room Temperature ◽  
Magnetization Direction ◽  
Zn Doping ◽  
Low Field

Zn-doping facilitates the alignment of magnetization direction of sub-10 nm Fe3O4 nanoparticles and enhances room temperature low-field magnetoresistance (LFMR).

Low-field formation of room-temperature biskyrmions in centrosymmetric MnPdGa magnet

2019 ◽  
Vol 114 (14) ◽  
pp. 142404 ◽  
Author(s):  
Xiaofei Xiao ◽  
Licong Peng ◽  
Xinguo Zhao ◽  
Ying Zhang ◽  
Yingying Dai ◽  
...  
Keyword(s):  
Room Temperature ◽  
Low Field ◽  
Field Formation

scholarly journals Room-Temperature Low-Field Colossal Magnetoresistance in Double-Perovskite Manganite

2019 ◽  
Vol 123 (12) ◽  
Author(s):  
S. Yamada ◽  
N. Abe ◽  
H. Sagayama ◽  
K. Ogawa ◽  
T. Yamagami ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Room Temperature ◽  
Double Perovskite ◽  
Perovskite Manganite ◽  
Low Field

Giant magneto-caloric effect around room temperature at moderate low field variation in La0.7(Ca1−xSrx)0.3MnO3 perovskites

2009 ◽  
Vol 404 (16) ◽  
pp. 2495-2498 ◽  
Author(s):  
M.S. Islam ◽  
D.T. Hanh ◽  
F.A. Khan ◽  
M.A. Hakim ◽  
D.L. Minh ◽  
...  
Keyword(s):  
Room Temperature ◽  
Field Variation ◽  
Low Field ◽  
Caloric Effect

scholarly journals Studies on Low-Field and Room-Temperature Magnetoresistance in La2/3(Ca1−x Sr x )1/3MnO3 Perovskites

2012 ◽  
Vol 26 (3) ◽  
pp. 719-723 ◽  
Author(s):  
D. G. Li ◽  
Y. T. Mai ◽  
J. Xoing ◽  
Y. H. Xiong ◽  
Z. L. Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Low Field

Enhanced low field magnetoresistance at room temperature in La0.7Sr0.3MnO3/SrTiO3(SrZrO3) composites

2001 ◽  
Vol 117 (4) ◽  
pp. 261-266 ◽  
Author(s):  
O.A Shlyakhtin ◽  
Young-Jei Oh ◽  
Yu.D Tretyakov
Keyword(s):  
Room Temperature ◽  
Low Field

Elaboration of Low Field and Room Temperature Magnetoresistive Sensor of La0.7Sr0.3MnO3 Nanoparticles Synthesized by Sol-Gel Method

2015 ◽  
Vol 771 ◽  
pp. 121-124 ◽  
Author(s):  
Christian Fredy Naa ◽  
Didier Fasquelle ◽  
Manuel Mascot ◽  
Mitra Djamal
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Magnetic Sensors ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Magnetoresistive Sensor ◽  
Low Field ◽  
Ferromagnetic Nature ◽  
Different Temperatures

Low field and room temperature operation range are two critical requirements for magnetic sensors. In this paper, nanoparticles of La0.7Sr0.3MnO3 (LSMO) were elaborated to fulfill these requirements. La0.7Sr0.3MnO3 nanoparticles were synthesized using sol-gel method. The physical properties of LSMO were examined by X-Ray diffraction and Scanning Electron Microscope. The ferromagnetic nature of LSMO samples was confirmed by magnetization measurements. Nanoparticles were pressed in shape of pellets and sintered at different temperatures of 900°C, 1000°C, 1100°C and 1200°C. Magnetoresistive measurements were taken at room temperature with magnetic field (μH) in range ±110 mT. The experimental results show maximum magnetoresistive ratio and sensitivity of 1.3% and 0.023%/mT respectively for sample sintered at 1000°C. Other sensor characteristics namely hysteresis error, response time and noise measurement were also given.

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