Room-temperature two-terminal magnetoresistance ratio reaching 0.1% in semiconductor-based lateral devices with L21-ordered Co2MnSi

2021 ◽  
Vol 118 (16) ◽  
pp. 162404
Author(s):  
K. Kudo ◽  
M. Yamada ◽  
S. Honda ◽  
Y. Wagatsuma ◽  
S. Yamada ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnetoresistance Ratio

Magnetoresistance ratio of more than 1% at room temperature in germanium vertical spin-valve devices with Co2FeSi

2021 ◽  
Vol 119 (19) ◽  
pp. 192404
Author(s):  
A. Yamada ◽  
M. Yamada ◽  
M. Honda ◽  
S. Yamada ◽  
K. Sawano ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Valve ◽  
Magnetoresistance Ratio

scholarly journals Over 1% magnetoresistance ratio at room temperature in non-degenerate silicon-based lateral spin valves

2020 ◽  
Vol 13 (8) ◽  
pp. 083002
Author(s):  
Hayato Koike ◽  
Soobeom Lee ◽  
Ryo Ohshima ◽  
Ei Shigematsu ◽  
Minori Goto ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Valves ◽  
Magnetoresistance Ratio ◽  
Silicon Based

Giant Magnetoresistance in FeMn/NiCoFe/Cu/NiCoFe Spin Valve Prepared by Opposed Target Magnetron Sputtering

2014 ◽  
Vol 979 ◽  
pp. 85-89 ◽  
Author(s):  
Ramli ◽  
Euis Sustini ◽  
Nurlaela Rauf ◽  
Mitra Djamal
Keyword(s):  
Magnetron Sputtering ◽  
Layer Thickness ◽  
Coercive Field ◽  
Giant Magnetoresistance ◽  
Room Temperature ◽  
Spin Valve ◽  
Ferromagnetic Layer ◽  
Vibrating Sample Magnetometer ◽  
Magnetoresistance Ratio ◽  
Scanning Electron

The giant magnetoresistance (GMR) effect in FeMn/NiCoFe/Cu/NiCoFe spin valve prepared by dc opposed target magnetron sputtering is reported. The spin valve thin films are characterized by Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometer (VSM) and magnetoresistance ratio measurements. All measurements are performed in room temperature. The inserted 45 mm thickness FeMn layer to the NiCoFe/Cu/NiCoFe system can increase the GMR ratio up to 32.5%. The coercive field to be increased is compared with different FeMn layer thickness. Furthermore, the coercive field (Hc) decreases with increasing FeMn layer thickness. Magnitude of coercive field is 0.1 T, 0.09 T and 0.08 T for FeMn layer thickness is 30 nm, 45 nm and 60 nm, respectively. The FeMn layer is used to lock the magnetization in the ferromagnetic layer through the exchange anisotropy. This paper will describe the development of a GMR spin valve and its magnetic properties.

Synthesis and Characterization of Double Perovskites Sr2FeMO6 (M = Mo, W)

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3500-3502
Author(s):  
T. S. Chan ◽  
R. S. Liu ◽  
G. Y. Guo ◽  
C. Y. Huang
Keyword(s):  
Room Temperature ◽  
Magnetic Measurements ◽  
Transition Metal Ions ◽  
Double Perovskites ◽  
Oxygen Ions ◽  
Physical Measurements ◽  
Band Structure Calculations ◽  
Magnetoresistance Ratio ◽  
Structure Calculations

We have investigated the magnetic and magnetotransport properties of monophasic double perovskites Sr 2 FeMO 6( M = Mo , W ). Magnetic measurements indicate that SFMO is a ferromagnet and SFWO is an antiferromagnet with TN = 35 K at H = 5 T . Large magnetoresistance ratio (MR) of ~ 22% (H = 3 T ) at room temperature (RT) was observed in the SFWO compound. However, the SFMO compound did not show any significant MR even at high fields and RT (MR~1%; H = 3 T and 300 K). The changes observed by physical measurements are supported by band structure calculations to explain the interaction between the 3d (Fe) , 4d (Mo) and 5d (W) orbitals of transition metal ions and oxygen ions.

Over 100% magnetoresistance ratio at room temperature in magnetic tunnel junctions with CuGaSe2 spacer layer

2019 ◽  
Vol 114 (17) ◽  
pp. 172402 ◽  
Author(s):  
K. Mukaiyama ◽  
J. W. Jung ◽  
H. Sepehri-Amin ◽  
S. Kasai ◽  
T. Furubayashi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Spacer Layer ◽  
Magnetoresistance Ratio

Magnetoresistance in a deformed Cu-Ni-Fe alloy with ultrafine multilayer structure

1994 ◽  
Vol 9 (5) ◽  
pp. 1134-1139 ◽  
Author(s):  
L.H. Chen ◽  
S. Jin ◽  
T.H. Tiefel ◽  
R. Ramesh
Keyword(s):  
Temperature Dependence ◽  
Multilayer Structure ◽  
Giant Magnetoresistance ◽  
Room Temperature ◽  
Phase Interface ◽  
Ferromagnetic Phase ◽  
Dramatic Improvement ◽  
Two Phase ◽  
Magnetoresistance Ratio ◽  
Spin Dependent Scattering

The creation of a giant magnetoresistance (GMR) effect in a spinodally decomposed and deformed Cu-20% Ni-20% Fe alloy is reported. The alloy is processed to contain a locally multilayered superlattice-like structure with alternating ferromagnetic and nonmagnetic layers with a size scale of 10-20 Å. The microstructural modification produced a dramatic improvement in room-temperature magnetoresistance ratio from ∼0.6 to ∼5%. The observed magnetoresistance is most likely related to the spin-dependent scattering at the two-phase interface and in the ferromagnetic phase, although the exact mechanism involved may be qualitatively different from the usual GMR picture. A rather unusual temperature-dependence of magnetoresistance ratio, i.e., the room-temperature value being greater than that at 4.2 K, was found.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

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