Electro-Assisted Magnetization Switching in Asymmetric Spin-Valves

2012 ◽  
Vol 190 ◽  
pp. 133-136
Author(s):  
V. Sohatsky
Keyword(s):  
Magnetic Field ◽  
Energy Balance ◽  
Applied Magnetic Field ◽  
Spin Valve ◽  
Electric Properties ◽  
Spin Valves ◽  
Magnetization Switching ◽  
Current Dependence ◽  
Magnetic And Electric Properties ◽  
Spin Transistor

The magnetic and electric properties of Fe/Cu/Fe sandwiches deposited on Si were studied in order to improve the efficiency of such a model of spin transistor with a spin-valve. Evaluations of the energy balance and measurements of current dependence on voltage and applied magnetic field confirmed the possibility of amplification increasing in case of additional effect of current on remagnetization.

INTERLAYER COUPLING AND MAGNETIC ANISOTROPY AS KEY FACTORS FOR CREATION OF HYSTERESIS-LESS SPIN VALVES

SPIN ◽  
2014 ◽  
Vol 04 (01) ◽  
pp. 1440001 ◽  
Author(s):  
V. V. USTINOV ◽  
M. A. MILYAEV ◽  
L. I. NAUMOVA
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Applied Magnetic Field ◽  
Easy Axis ◽  
Spin Valve ◽  
Interlayer Coupling ◽  
Spin Valves ◽  
Free Layer ◽  
Key Factors ◽  
Low Field

The dependence of the free layer coercivity on the applied magnetic field (MF) deviation from the main anisotropy directions (free layer easy axis (EA) and pinning direction (PD)) and on 〈111〉 texture strength have been studied on [ Ta , ( Ni 80 Fe 20)60 Cr 40]/ Ni 80 Fe 20/ Co 90 Fe 10/ Cu / Co 90 Fe 10/ Mn 75 Ir 25/ Ta spin valves. The effect of interlayer coupling, magnetic anisotropy and texture on the spin valve coercivity is analyzed. Technological steps aimed at the low field coercivity reduction down to few tenths Oersted have been received.

Stress in Spin Valve Multilayers During Antiferromagnetic Phase Transformation

1999 ◽  
Vol 594 ◽  
Author(s):  
B. J. Daniels ◽  
S. P. Bozeman ◽  
H HA
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Applied Magnetic Field ◽  
Spin Valve ◽  
Spin Valves ◽  
Face Centered Cubic ◽  
Antiferromagnetic Phase ◽  
Wafer Curvature ◽  
The Face ◽  
Face Centered

AbstractThe stresses in sputter-deposited, NiMn- and PtMn-pinned top spin valve multilayers were measured using a laser-based wafer curvature technique. As-deposited stresses were 150 to 180 MPa in compression for NiMn- and 970 to 1020 MPa in compression for PtMn-pinned spin valves. Following deposition and stress measurement, these films were annealed in an applied magnetic field of 250 Oe for 2 hours at 300°C. This anneal causes the antiferromagnetic layer to undergo a phase transformation from the face-centered cubic (fcc) to the face-centered tetragonal (fct) crystal structure. This phase transformation increases the average stresses in the spin valves to 740–800 MPa in tension for the NiMn-pinned spin valves and to 475–580 MPa for the PtMnpinned spin valves. Stress changes during the antiferromagnetic phase transformation were also observed as a function of annealing temperature and time during substrate heating, annealing, and cooling. The stress varied nearly linearly with temperature during the heating and cooling of the substrate, indicating that the bulk of the phase transformation occurs during the isothermal portion of the anneal. By monitoring stress vs time during the isothermal anneal, the progression of the antiferromagnetic phase transformation was observed. Final stress data obtained from the wafers annealed in the wafer curvature system (no applied magnetic field) are within 10% of those obtained using the magnetic annealing process.

scholarly journals Modeling of GMR loops asymmetry in spin valves

2018 ◽  
Vol 185 ◽  
pp. 01011
Author(s):  
Alexander Kurenkov ◽  
Georgy Babaizev ◽  
Nikolay Chechenin
Keyword(s):  
Magnetic Field ◽  
Simple Technique ◽  
Spin Valve ◽  
Hysteresis Loops ◽  
Spin Valves ◽  
Physical Factors ◽  
Regular Shape ◽  
Ferromagnetic Layers ◽  
Insight Into ◽  
Selection Of

The regular shape of the magnetoresistance as a function of applied magnetic field, R(H), is important for numerous spin valves applications. Nevertheless, in many practical studies the shape of the R(H) curve is unpredictably complicated. A simple technique, proposed in this paper, allows interpreting the R(H) features and calculating R(H) curves from known hysteresis loops of ferromagnetic layers, composing spin valves. And vice versa, the shape of the hysteresis loops of the composing ferromagnetic layers can be obtained from R(H) curves.The method does not give an insight into the physical factors determining the shape of hysteresis loops, but it is suitable for prompt selection of promising spin valve stacks. A series of spin valve structures was prepared and their magnetoresistance curves were measured. The analysis of the experimental data demonstrates the capacity of the proposed method.

Sharp Angular Dependence of Free Layer Coercivity in Spin Valves with Ferromagnetic Interlayer Coupling

2014 ◽  
Vol 215 ◽  
pp. 474-479 ◽  
Author(s):  
Larisa I. Naumova ◽  
M.A. Milyaev ◽  
N.G. Bebenin ◽  
Tatyana A. Chernyshova ◽  
Vyacheslav V. Proglyado ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Applied Magnetic Field ◽  
Easy Axis ◽  
Sharp Decrease ◽  
Interlayer Coupling ◽  
Spin Valves ◽  
Magnetic Reversal ◽  
Free Layer ◽  
Angle Dependence

The dependence of free layer coercivity on the angle between easy axis and applied magnetic field was studied on [Ta, (Ni80Fe20)60Cr40]/ Ni80Fe20/Co90Fe10/Cu/Co90Fe10/Mn75Ir25/Ta spin valves with various interlayer coupling. Sharp decrease on the angle was observed for ferromagnetically coupled spin valves. The coercivity was reduced down to tenth of Oersted without any decrease of GMR-effect by forming nearly parallel anisotropy configuration. The angles at which the transition from hysteretic to anhysteretic magnetic reversal takes place are detected by analyses of the angle dependence of coercivity. Interpretation of experimental data is based on Stoner-Wohlfarth coherent rotation approach.

Magnetic and electric properties of YbB12 under high magnetic field

1985 ◽  
Vol 52 (1-4) ◽  
pp. 283-285 ◽  
Author(s):  
K. Sugiyama ◽  
A. Ohya ◽  
M. Date ◽  
F. Iga ◽  
M. Kasaya ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Electric Properties ◽  
Magnetic And Electric Properties

Magnetic and electric properties of multiferroic LiFeP2O7. Comparison with LiCrP2O7

2021 ◽  
pp. 2150158
Author(s):  
A. T. Apostolov ◽  
I. N. Apostolova ◽  
J. M. Wesselinowa
Keyword(s):  
Magnetic Field ◽  
Magnetoelectric Effect ◽  
Indirect Evidence ◽  
Weak Ferromagnetism ◽  
Electric Properties ◽  
Function Technique ◽  
Antiferromagnetic Order ◽  
Magnetoelectric Properties ◽  
Magnetic Orders ◽  
Magnetic And Electric Properties

The temperature and magnetic field dependence of the magnetic and electric properties of LiFeP2O7 (LFPO) and LiCrP2O7 (LCPO) are studied using a microscopic model and the Green’s function technique. We have shown that LFPO is antiferromagnetic, but shows a weak ferromagnetism along the [Formula: see text] axis which originates from the canted antiferromagnetic order. For LCPO, such a ferromagnetic order along the [Formula: see text] axis is not observed. In the temperature dependence of the electrical polarization [Formula: see text] along the [Formula: see text] axis there is a kink at [Formula: see text] K which is an indirect evidence for the intrinsic magnetoelectric effect in LFPO. Applying an external magnetic field [Formula: see text], the polarization [Formula: see text] increases, stronger for small temperatures and the kink at [Formula: see text] disappears. For LCPO, we do not obtain a kink at [Formula: see text] K. LCPO is polar, but not ferroelectric. We can conclude that the missing magnetoelectric properties in LCPO could be due to the differences in the magnetic orders between LFPO and LCPO.

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