High Sensitivity Spin Valve Sensors With AF Coupled Flux Guides

2008 ◽  
Vol 44 (11) ◽  
pp. 2472-2474 ◽  
Author(s):  
I.G. Trindade ◽  
J. Teixeira ◽  
R. Fermento ◽  
J.B. Sousa ◽  
S. Cardoso ◽  
...  
Keyword(s):  
Spin Valve ◽  
High Sensitivity

Microstructure of spin-valve mr sandwiches

1995 ◽  
Vol 53 ◽  
pp. 484-485
Author(s):  
L. Tang ◽  
M. Xiao ◽  
D.E. Laughlin ◽  
M. H. Kryder
Keyword(s):  
Giant Magnetoresistance ◽  
Metal Layer ◽  
Spin Valve ◽  
High Sensitivity ◽  
Magnetic Multilayers ◽  
Multilayered Structures ◽  
Ferromagnetic Layers ◽  
Antiferromagnetic Layer ◽  
Intensive Investigation ◽  
High Density Magnetic Recording

Giant magnetoresistance ( GMR ) effects in magnetic multilayers with spin-valve structures are under intensive investigation. The GMR effects in spin-valve structures originate from the change in the orientation of magnetization in the successive ferromagnetic layers. Of the various types of spin-valve multilayered structures reported, spin-valve sandwiches, in which one of the two ferromagnetic layers separated by a nonferromagnetic metal layer is constrained through exchange coupling to an adjacent antiferromagnetic layer, are most promising for applications in read heads for high density magnetic recording. This is due to their large MR and high sensitivity in low magnetic fields. Study of the correlation between magnetic/magnetotransport properties and the microstructure of spin-valve sandwiches is crucial for a better understanding of the mechanism of the spin-valve effects and for future MR heads design. Here, we present the results of transmission electron microscopy (TEM) studies of the microstructure of a Ni81Fe19(47Å)\Cu(18Å)\Ni81Fe19(53Å)\FeMn(186Å) spin-valve sandwich.

High sensitivity spin-valve strain sensor

1998 ◽  
Vol 72 (24) ◽  
pp. 3220-3222 ◽  
Author(s):  
H. J. Mamin ◽  
B. A. Gurney ◽  
D. R. Wilhoit ◽  
V. S. Speriosu
Keyword(s):  
Spin Valve ◽  
Strain Sensor ◽  
High Sensitivity

Monolithic integration of focused 2D GMR spin valve magnetic field sensor for high-sensitivity (compass) applications (Presentation Recording)

2015 ◽  
Author(s):  
Olaf Ueberschär ◽  
Maria J. Almeida ◽  
Patrick Matthes ◽  
Mathias Müller ◽  
Ramona Ecke ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Valve ◽  
High Sensitivity ◽  
Monolithic Integration ◽  
Magnetic Field Sensor ◽  
Field Sensor

Very high sensitivity GMR spin-valve magnetometer

1997 ◽  
Vol 33 (5) ◽  
pp. 3385-3387 ◽  
Author(s):  
N. Smith ◽  
A.M. Zeltser ◽  
D.L. Yang ◽  
P.V. Koeppe
Keyword(s):  
Spin Valve ◽  
High Sensitivity ◽  
Very High

scholarly journals Quasi-Static Current Measurement with Field-Modulated Spin-Valve GMR Sensors

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1882
Author(s):  
Jen-Tzong Jeng ◽  
Xuan-Thang Trinh ◽  
Chih-Hsien Hung ◽  
Chih-Cheng Lu
Keyword(s):  
Spin Valve ◽  
High Sensitivity ◽  
Current Measurement ◽  
Linear Range ◽  
Current Sensing ◽  
Measured Current ◽  
Ferrite Ring ◽  
Gmr Sensors ◽  
Gmr Sensor ◽  
Ring Core

A non-contact current measurement device comprised of a GMR sensor and a ferrite ring core was investigated. The sensor chip employed a high-sensitivity spin-valve full-bridge GMR sensor of which the direct output has non-negligible hysteresis and a limited linear range. By applying an AC modulation current to modulate the output of the GMR sensor, the hysteresis was reduced, and the linear range was over ±0.5 A. The resolution for DC and quasi-static current measurement was 0.1 mA at a 10 Hz bandwidth. The output in proportion to the measured current was obtained either by demodulating the current-sensitive AC signal or by employing the filtered output of the intrinsically nonlinear spin-valve response. The proposed current sensing scheme is suitable for quasi-static current measurement from DC to over 100 Hz.

Optimized Monolithic 2-D Spin-Valve Sensor for High-Sensitivity Compass Applications

2015 ◽  
Vol 51 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Olaf Ueberschar ◽  
Maria J. Almeida ◽  
Patrick Matthes ◽  
Mathias Muller ◽  
Ramona Ecke ◽  
...  
Keyword(s):  
Spin Valve ◽  
High Sensitivity

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

Backscattered Electron Imaging of GaAs/AlGaAs Super Lattice Structures with an Ultra-High- Resolution SEM

1988 ◽  
Vol 46 ◽  
pp. 204-205
Author(s):  
Kazumichi Ogura ◽  
Michael M. Kersker
Keyword(s):  
High Resolution ◽  
Layer Structure ◽  
High Sensitivity ◽  
Beam Current ◽  
Electron Beam Current ◽  
Lattice Structures ◽  
Super Lattice ◽  
Different Types ◽  
Backscattered Electron ◽  
Electron Imaging

Backscattered electron (BE) images of GaAs/AlGaAs super lattice structures were observed with an ultra high resolution (UHR) SEM JSM-890 with an ultra high sensitivity BE detector. Three different types of super lattice structures of GaAs/AlGaAs were examined. Each GaAs/AlGaAs wafer was cleaved by a razor after it was heated for approximately 1 minute and its crosssectional plane was observed.First, a multi-layer structure of GaAs (100nm)/AlGaAs (lOOnm) where A1 content was successively changed from 0.4 to 0.03 was observed. Figures 1 (a) and (b) are BE images taken at an accelerating voltage of 15kV with an electron beam current of 20pA. Figure 1 (c) is a sketch of this multi-layer structure corresponding to the BE images. The various layers are clearly observed. The differences in A1 content between A1 0.35 Ga 0.65 As, A1 0.4 Ga 0.6 As, and A1 0.31 Ga 0.69 As were clearly observed in the contrast of the BE image.

Sign in / Sign up

Export Citation Format

Share Document