Microwave signal emission in spin-torque vortex oscillators in metallic nanowires: Experimental measurements and micromagnetic numerical study

2012 ◽  
Vol 86 (6) ◽  
Author(s):  
F. Abreu Araujo ◽  
M. Darques ◽  
K. A. Zvezdin ◽  
A. V. Khvalkovskiy ◽  
N. Locatelli ◽  
...  
Keyword(s):  
Numerical Study ◽  
Microwave Signal ◽  
Spin Torque ◽  
Experimental Measurements ◽  
Metallic Nanowires

scholarly journals Numerical study of guided modes in arrays of metallic nanowires

2007 ◽  
Vol 32 (12) ◽  
pp. 1647 ◽  
Author(s):  
C. G. Poulton ◽  
M. A. Schmidt ◽  
G. J. Pearce ◽  
G. Kakarantzas ◽  
P. St.J. Russell
Keyword(s):  
Numerical Study ◽  
Metallic Nanowires ◽  
Guided Modes

On Flowfield Periodicity in the NASA Transonic Flutter Cascade: Part II — Numerical Study

2000 ◽  
Author(s):  
R. V. Chima ◽  
E. R. McFarland ◽  
J. R. Wood ◽  
J. Lepicovsky
Keyword(s):  
Static Pressure ◽  
Numerical Study ◽  
Three Dimensional ◽  
Side Wall ◽  
Wave Structure ◽  
Experimental Measurements ◽  
Flow Conditions ◽  
Pressure Sensitive ◽  
Transonic Flutter ◽  
Probe Measurements

The transonic flutter cascade facility at NASA Glenn Research Center was redesigned based on a combined program of experimental measurements and numerical analyses. The objectives of the redesign were to improve the periodicity of the cascade in steady operation, and to better quantify the inlet and exit flow conditions needed for CFD predictions. Part I of this paper describes the experimental measurements, which included static pressure measurements on the blade and endwalls made using both static taps and pressure sensitive paints, cobra probe measurements of the endwall boundary layers and blade wakes, and shadowgraphs of the wave structure. Part II of this paper describes three CFD codes used to analyze the facility, including a multibody panel code, a quasi-three-dimensional viscous code, and a fully three-dimensional viscous code. The measurements and analyses both showed that the operation of the cascade was heavily dependent on the configuration of the sidewalls. Four configurations of the sidewalls were studied and the results are described. For the final configuration, the quasi-three-dimensional viscous code was used to predict the location of mid-passage streamlines for a perfectly periodic cascade. By arranging the tunnel sidewalls to approximate these streamlines, side-wall interference was minimized and excellent periodicity was obtained.

A numerical study of spin torque oscillators based on IMA/PMA bilayer nano-pillars

2020 ◽  
Vol 31 (34) ◽  
pp. 345709
Author(s):  
X Yuan ◽  
Z Lu ◽  
S Li ◽  
S Fan ◽  
G Wang ◽  
...  
Keyword(s):  
Numerical Study ◽  
Spin Torque ◽  
Spin Torque Oscillators

Empirical Heat Transfer Correlations during Frost Deposition on a Triangular Tube Banks Arrangement

2016 ◽  
Vol 366 ◽  
pp. 88-96
Author(s):  
Raquel da Cunha Ribeiro da Silva ◽  
Carlos Salinas Sedano ◽  
Kamal A.R. Ismail ◽  
Paúl Adrian Delgado Maldonado
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Numerical Study ◽  
Experimental Measurements ◽  
Empirical Correlations ◽  
Frost Formation ◽  
Cylindrical System ◽  
Experimental Correlation ◽  
Tube Banks ◽  
Dimensionless Correlations

An experimental study was reported earlier on the development of frost formation by humid flow passing over the cylinder. In this study, dimensionless correlations used in previous experimental data, and reported empirical correlations of the Nusselt number, were used. This paper reports results of an experimental and numerical investigation where the emphasis was placed on obtaining empirical correlation for the Nusselt number. In this work some experimental results of the frost thickness around every cylinder in a triangular arrangement are presented, an estimated experimental correlation to find Nusselt number. This correlation is based on the experimental measurements in a wind tunnel situated in the Laboratory of Thermal storage and Fluids in the Mechanical Engineering Faculty at Unicamp. A numerical study is performed to study the frost formation in the cylindrical system.

Ac Response of Heterogeneous Materials: A Numerical Study

1996 ◽  
Vol 463 ◽  
Author(s):  
A. A. Rodriguez ◽  
J. Valbuena
Keyword(s):  
Distribution Function ◽  
Electrical Properties ◽  
Numerical Study ◽  
Experimental Measurements ◽  
Power Law Distribution ◽  
Scaling Properties ◽  
Strong Disorder ◽  
Hierarchical Lattices ◽  
Ac Response ◽  
Dc Electrical Properties

ABSTRACTThe ac and dc electrical properties of composite materials are studied using hierarchical lattices. First we show that the hierarchical model can correctly account for the main scaling properties of critical percolative structures. Then we study the effect of potential disorder by assuming that the microscopic conductances are distributed according to a power law distribution function. We find that in the limit of strong disorder, the predictions are in qualitative agreement with reported experimental measurements.

Low-current, narrow-linewidth microwave signal generation in NiMnSb based single-layer nanocontact spin-torque oscillators

2016 ◽  
Vol 109 (22) ◽  
pp. 222403 ◽  
Author(s):  
P. Dürrenfeld ◽  
F. Gerhard ◽  
S. M. Mohseni ◽  
M. Ranjbar ◽  
S. R. Sani ◽  
...  
Keyword(s):  
Single Layer ◽  
Microwave Signal ◽  
Signal Generation ◽  
Spin Torque ◽  
Narrow Linewidth ◽  
Microwave Signal Generation ◽  
Spin Torque Oscillators

Rotational Compliance Measurements of a Flexible Plane Structure Using an Attached Beam-like Tip, Part 2: Experimental Study

1997 ◽  
Vol 119 (4) ◽  
pp. 603-608 ◽  
Author(s):  
Y. C. Qu ◽  
L. Cheng ◽  
D. Rancourt
Keyword(s):  
Experimental Study ◽  
Error Analysis ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Companion Paper ◽  
Experimental Measurements ◽  
Frequency Range ◽  
Experimental Assessment ◽  
Different Types ◽  
Modal Behavior

This paper presents an experimental assessment of the Tip Excitation Technique (TET) introduced in a companion paper. The aim of the technique is to measure the rotational compliance of attached plane structures. Following the guidelines established on the basis of a numerical study in the companion paper, experimental measurements were performed on a rectangular plate and results were compared with numerical simulations. The investigation focuses on the general performance of the technique, on the different types of excitation used and on other factors necessary to ensure accurate results. In addition, an error analysis is conducted to demonstrate the sensitivity of the results to biased measurement quantities. It is concluded that the proposed technique can be used in the low to middle frequency range, where relatively strong modal behavior is involved.

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