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Tuesday, November 10, 2020 | History

2 edition of Uniaxial anisotropy theory and analysis of torque data found in the catalog.

Uniaxial anisotropy theory and analysis of torque data

Brad Paul

Uniaxial anisotropy theory and analysis of torque data

  • 232 Want to read
  • 15 Currently reading

Published .
Written in English

    Subjects:
  • Ansiotropy,
  • Torque,
  • Physics

  • Edition Notes

    Statementby Brad Paul
    The Physical Object
    Paginationii, 35 leaves :
    Number of Pages35
    ID Numbers
    Open LibraryOL17931122M

    eFatigue: Fatigue Analysis on the Web. The eFatigue website gives you easy access to modern fatigue analysis tools and technology from any web browser— everything you need for computing the fatigue lives of metallic machine components and structures, including fatigue calculators, material databases, and stress concentration an eFatigue subscription, you'll also have access to. Furthermore we observe a reduction of the in-plane biaxial anisotropy and a change of the uniaxial anisotropy with the increase of Co content in the sample, while the film thickness is kept. This book provides a complete and comprehensive development of failure theory for homogeneous materials. The resultant failure criteria to be used for applications with isotropic materials are calibrated by only two properties: the uniaxial tensile and compressive strengths, T and C. From these data the entire family of failure envelopes can be generated for all states of stress. Data on the Co/Pd ML structure, magnetization and anisotropy (per Co volume), domain width and in-plane exchange stiffness from the model fitting. The numbers of bilayers are 25 and 7 in samples (rows) and , respectively tCo tvd M s Kef f D A (nm) (nm) (kA/m) (kJ/m 3) (nm) (p J/m).


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Uniaxial anisotropy theory and analysis of torque data by Brad Paul Download PDF EPUB FB2

Uniaxial anisotropy The most common anisotropy effect is connected to the existence of one only easy direction, and in literature it is referred Uniaxial anisotropy theory and analysis of torque data book as uniaxial anisotropy.

Thus, the anisotropy free energy density an will be rotationally-symmetric with respect to the easy axis and will depend only on the relative orientation of with.

O'SHEA et al.: MOVABLE UNIAXIAL MACROSCOPIC ANISOTROPY IN AMORPHOUS Tb-Fe Fig. Fig. Fig. - Magnetization of the Tb25Fe75 alloy after field cooling the sample in 8 kOe to K. Fig. Torque as a function of applied field at SH = 10" and K for Tb25FeThe full circles are the experimental points, the full line is a fit to the rigid rotation model with uniaxial.

The influence of the magnetocrystalline anisotropy energy on the static torque of uniaxial antiferromagnets is investigated. It is shown that this influence provides a method for accurate determination of the first anisotropy constant K 1 of most uniaxial antiferromagnets.

Experimental results are shown from measurements on the hexagonal polymorph of by: 6. The free energy is evaluated for a uniaxial superconductor with the anisotropy of the upper critical field, gamma(H)=H(c2,a)/H(c2,c), different from the anisotropy of the penetration depth gamma.

KV the uniaxial anisotropy of a magnet of volume V, anisotropy field H K and saturation magnetiza-tion M S. The applied field is H and n^ K is a unit vector repre-senting the orientation of the uniaxial anisotropy (easy) axis. Of special interest is the interplay between spin-torque and thermal noise effects.

A spin current also induces magnet. anisotropy. Clearly, the MAE can be evaluated very effi-ciently through calculating the torque at u° even when K4 is not negligible.

We next come to the question of how to calculate the torque. Within the framework of local-spin-density theory, including SOC, the total energy of the system is6 [email protected]~u!;u#5(occ. [email protected]~u!;u#[email protected]~u!#, ~4. Torque data on single crystals of Tb and Dy in fields up to kOe yielded values of the uniaxial anisotropy constant K 2 of ×10 8 erg/cm 3 at 11°K to ×10 8 erg/cm 3 at °K for Tb, and 5×10 8 erg/cm 3 at 22°K to ×10 8 erg/cm 3 at °K for Dy.

The cluster has a ground spin state of S = 5, which is selectively populated below 20 K. High-field EPR spectra revealed that the system has a uniaxial magnetic anisotropy, corresponding to a zero. energy. The maximum stress and strain for the uniaxial tension tests were determined by finding the local maximum of the stress-strain curve before fracture of the samples occurred.

Results Uniaxial Tension Figure shows the measured stress versus strain data for brass, aluminum (alloy ), copper, and steel specimen tested under. Torque data on single crystals of Tb and Dy in fields up to kOe yielded values of the uniaxial anisotropy constant K 2 of ×10 8 erg/cm 3 at 11°K to ×10 8 erg/cm 3 at °K for Tb, and 5×10 8 erg/cm 3 at 22°K to ×10 8 erg/cm 3 at °K for Dy.

To verify our theory, we have developed an efficient GPU-based micromagnetic code to simulate the stochastic LLG dynamics out to millisecond timescales. We explore the effects of geometrical tilts between the spin-current and uniaxial anisotropy axes on the thermally assisted dynamics. A well-known behavior pattern which is of considerable interest in many engineering applications is the rock anisotropy.

Significant errors can be introduced in stress and deformation analyses by assuming anisotropic rocks to be isotropic. Many Authors have given careful attention to this problem. A quantitative analysis of the temperature dependence of the effective anisotropy field of γ-Fe 2 O 3 NPs found an enhanced value of the magnetic anisotropy constant of NPs relative to bulk material, which is associated with the influence of surface and shape effects.

The analysis of the angular dependence performed on the field-freezing (FF. Spin-transfer torque magnetization reversal in uniaxial nanomagnets with thermal noise D. Pinna,1,a) A.

Kent,1 and D. Stein1,2 1Department of Physics, New York University, New York, New YorkUSA 2Courant Institute of Mathematical Sciences, New York University, New York, New YorkUSA (Received 10 March ; accepted 23 June ; published online 15 July ).

Integrated optics (IO) devices have become an essential part of the telecommunication industry as signal processing devices and are finding new applications in other areas such as sensors.

Recently single crystal fibers are emerging as an attractive component in the area of optical second harmonic generation and fiber lasers due to their long length, small diameter, light weight and high. The two-ion term must give rise to the uniaxial anisotropy as it has the weaker temperature dependence.

This implies the single-ion is negative, giving an in-plane anisotropy which is initially slightly larger than than the two-ion term. Our analysis gives the values of MJ m −3 —an in-plane anisotropy and MJ m −3. The magnetic anisotropy can be described by different parameters, and in this study we use the susceptibility difference Δk=k 1 −k 3 and the U-parameter (Jelinek ).The U-parameter is a shape factor, similar to the T-parameter (Jelinek ), but based on susceptibility differences, where U= (2k 2 −k 1 −k 3)/(k 1 −k 3).Therefore, a perfectly oblate shape would result in U= 1 and a.

Here, we investigated the phonon response of few layer BP under uniaxial tensile strain (~7%) with in situ polarized Raman spectroscopy. Together with the first-principles density functional theory (DFT) analysis, the anisotropic Poisson’s ratio in few-layer BP was verified as one of the primary factors that caused the large discrepancy in.

The magnetocrystalline anisotropy (MCA) of (Ga,Mn)As films has been studied on the basis of ab initio electronic structure theory by performing magnetic torque calculations.

An appreciable contribution to the in-plane uniaxial anisotropy can be attributed to an extended region adjacent to the surface. Calculations of the. Magnetically controlled rotation and torque of uniaxial microactuators for lab-on-a-chip applications PDF (K) Movie showing the rotation of a microactuator for applied field frequencies below and just above the critical frequency WMV (K) Movie showing the rotation of a microactuator for applied field frequencies just above the critical frequency WMV (K).

theory of AFMR with uniaxial anisotropy. Analysis yields an anisotropy energy of cm The ratio between the anisotropy field and the exchange field is Thus, KNiF 3 is an excellent example of a Heisenberg antiferromagnet. @S~99!X# Perovskite materials have received enormous attention in.

determine the effect of geometrical tilts between the spin-current and uniaxial anisotropy axes on the thermally assisted reversal dynamics. The asymptotic behavior of the switching time (I → 0, torque generated by current polarized in the direction nˆ suitable for Kramer’s theory analysis.

The variation of their plastic behavior with direction is assessed by a quantity called Lankford parameter or anisotropy coefficient []. This coefficient is determined by uniaxial tensile tests on sheet specimens in the form of a strip.

The anisotropy coefficient (r) is defined by. The uniaxial magnetic anisotropies by torque measurement have been measured for Fe{sub 16}N{sub 2}() films exhibits perpendicular uniaxial anisotropy which makes the easy axis along the [] direction, and those anisotropy constants K{sub U1} and K{sub U2} for Fe{sub 16}N{sub 2} were x 10{sup 7} and x 10{sup 7} erg/cm{sup 3.

The counter-clockwise torque was caused by the mass of the meter stick on that side of the pivot point, and the mass of the g weight. This method of dividing the mass of a uniform objects length is the same way to find the mass of a small unit of any uniform object, such as a one meter long metal bar.

Concerning the magnetic properties, remarkable agreement between theory and experiment has been achieved; on the other hand, controversial views regarding the existence of anisotropy in the superconducting energy gap are presented.

In both cases, how­ ever, theorists and experimentalists are still confronted with a number of open questions. and strain-hardening characteristics.[3] Uniaxial tensile testing is the most commonly used for obtaining the mechanical characteristics of isotropic materials.

For anisotropic materials, such as composite materials and textiles, biaxial tensile testing is required.3/5(8). () Critical properties of x y spin‐one chains with uniaxial single‐ion anisotropy. Journal of Applied Physics() Methods in hamiltonian lattice field theory (II).

We develop an effective medium theory of the nonlinear elasticity of a random sphere pack based upon the underlying Hertz-Mindlin theory of grain-grain contacts. We compare our predictions for the stress-dependent sound speeds against new experimental data taken on samples with stress-induced uniaxial.

ISBN: X: OCLC Number: Description: 1 online resource: Contents: 1. The Upper Critical Field --R-1 On the Theory of Macroscopic Anisotropy Phenomena in Type-II Superconductors --R-2 Experimental Investigations on the Anisotropy of the Upper Critical Field in Type-II Superconductors Hc2 and Related Properties --C.

Waals energy and torque can be simplified by giving the scaling of the torque as sin(2h) The dielectric tensor of an anisotropic material can be written as e ¼ ea 00 0 eb 0 00ec 2 4 3 5: Often, the dielectric anisotropy is semi-uniaxial. For example, rutile TiO 2 is anisotropic.

Therefore the uniaxial anisotropy K u is small compared with H when approaching room temperature. This behaviour is similar to the peak shown in Fig. As T decreases, K u enhances H a, which requires a stronger H to compete with H a, hence the generated transient torque and amplitude A decrease.

Magnetic droplet solitons 1 form in spin transfer torque oscillators 2,3,4,5,6,7 that consist of nanometer scale electrical contacts to thin films with perpendicular magnetic anisotropy 3,4,8,9,   Furthermore, the structure of the theory should be flexible enough to accommodate any additional experimental test data (other than the conventional 0, 45 and 90° uniaxial tensile test datasets) so that the accuracy and predictability of the anisotropic plastic flow theory can be improved (Barlat et al.

Magnetic Anisotropy in Quantum Systems. The microscopic origin of MA is the combined effect of the anisotropy in the atom’s orbital angular momentum (L), together with the interaction between L and the atom’s spin angular momentum (S).This interaction is given by H SOC = λLS, where λ is the atomic spin-orbit coupling solids and molecules, L tends to align.

5] Data such as those shown in Figure 1c plot in the box labeled SD in the Day diagram (Figure 1d) and have been interpreted as being the result of magnetite dominated by cubic anisotropy [e.g., Gee and Kent, ]. This interpretation presents two difficulties.

First, according to single domain theory, only equant grains of (titano)magnetite can. thermal radiative transfer and properties Posted By Leo Tolstoy Media Publishing TEXT ID ff24 Online PDF Ebook Epub Library radiative transfer and properties book reviews author details and more at amazonin free delivery on qualified orders radiative properties are fundamental physical.

C-4 Anisotropy of Hc2 in PbTl-Alloys.- C-5 Comments on Hc2 at Low Temperatures.- C-6 The Influence of Magnetic Anisotropy on the Properties of Niobium in the Mixed State.- C-7 Anisotropy of the Stress Dependence of Critical Parameters in Uniaxial Superconductors.- 3. Flux Lines.- R-3 Magnetization and Flux Line Lattice in Anisotropic.

mean field theory are of importance for a correct description. The material exhibits a uniaxial magnetic anisotropy for a range of cobalt concentrations between x= and x= A sim-ple model for the temperature dependence of magnetic anisotropy suggests that the complicated.

The uniaxial perfectly matched layer (PML) method uses a rectangular domain to define the PML problem and thus provides greater flexibility and efficiency in dealing with problems involving anisotropic scatterers. In this paper we first derive the uniaxial PML method for solving the time-domain scattering problem based on the Laplace transform and complex coordinate stretching in the frequency.

We theoretically investigate the electronic and magnetic structure of Fe 2 Hf. The density functional theory calculations are shown to produce the negative, easy-plane, magnetic anisotropy in the hexagonal Fe 2 Hf.

Antimony substitution suppresses the planar magnetization direction and favors the uniaxial magnetic anisotropy, in agreement with experimental observations. The actual magnetization angles and uniaxial anisotropy are self-consistently calculated from the dependence of the resonant field on the external magnetic field angle This also allows the.In the past few years, the manipulation of magnetic domain wall (DW) motion has attracted intensive attention for its fundamental interest and potential impacts in logic operations and data storage devices 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,The DW motion can be controlled so far by static magnetic fields 1,2,3,4, spin transfer torque 5,6,7,8,9,10, microwaves or field pul12, and.