scholarly journals Effects of composition on the stability of the magnetic order of ferrimagnetic multilayers

2002 ◽  
Vol 65 (17) ◽  
Author(s):  
Ana L. Dantas ◽  
Selma R. Vieira ◽  
A. S. Carriço
Keyword(s):  
Magnetic Order ◽  
The Stability

LONG–RANGE MAGNETIC ORDER IN La2NiO4+δ UNDER SMALL OXYGEN EXCESS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 178-181
Author(s):  
YURY G. POGORELOV
Keyword(s):  
Long Range ◽  
Continuum Model ◽  
Magnetic Order ◽  
Oxide Compound ◽  
Range Magnetic Order ◽  
Magnetic Symmetry ◽  
Oxygen Excess ◽  
The Stability ◽  
Effect Of Oxygen ◽  
Long Range Magnetic Order

Within a continuum model based on the microscopic magnetic symmetry of Ni 2+ ion (spin S = 1) in the metal-oxide compound La 2 NiO 4+δ, a theoretical analysis is made of the stability of antiferromagnetic long-range order under the effect of oxygen interstitials at δ ≪ 1. It is shown that the Néel temperature dicreases significantly with growing δ though does not become zero, in contrast to that in the structurally isomorhic compound La 2 CuO 4+δ (but Cu 2+ spin S = 1/2).

Magnetic Field Effects in Antiferromagnetic CePd3In2

2011 ◽  
Vol 170 ◽  
pp. 219-222 ◽  
Author(s):  
André M. Strydom ◽  
Douglas Britz
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Specific Heat ◽  
Magnetic Order ◽  
Magnetic Field Effects ◽  
Rare Earth Compound ◽  
Field Effects ◽  
The Stability ◽  
The Rare Earth

We present results of specific heat and magnetic susceptibility measurements as function of temperature and magnetic field on the rare-earth compound CePd3In2. Known to order antiferromagnetic below 2.1 K, we discuss the influence of magnetic field on the stability of the magnetic order.

scholarly journals Ab initio study of the phase stability of modulated structures in Co-doped Ni-Mn-In (Sn) Heusler alloys

2022 ◽  
Vol 1213 (1) ◽  
pp. 012008
Author(s):  
K R Erager ◽  
V V Sokolovskiy ◽  
V D Buchelnikov
Keyword(s):  
Ab Initio ◽  
Phase Stability ◽  
Magnetic Order ◽  
Heusler Alloys ◽  
Ab Initio Study ◽  
Equilibrium Conditions ◽  
Modulated Structures ◽  
The Stability ◽  
Ground State Energies ◽  
Co Doped

Abstract Using ab initio calculations, the phase stability of modulated and tetragonal martensitic structures in Ni43.75Co6.25Mn43.75(In, Sn)6.25 Heusler alloys with different magnetic order is investigated. The stability against the segregation is considered by a method for generating all possible decay reactions assuming the calculated ground state energies of each composition. It is shown that the highest probable stability under equilibrium conditions is demonstrated by alloys with tetragonal martensitic structure in accordance with reactions: Ni35Co5Mn35In5 → 25Mn + 35Ni + 5Mn2InCo and Ni35Co5Mn35Sn5 → 5CoSn + 35Mn + 35Ni.

Structural effect on the stability of magnetic order in La1.875Ba0.125−xSrxCuO4

2002 ◽  
Vol 378-381 ◽  
pp. 390-394
Author(s):  
H Goka ◽  
K Kubo ◽  
T Uefuji ◽  
M Fujita ◽  
K Yamada ◽  
...  
Keyword(s):  
Magnetic Order ◽  
Structural Effect ◽  
The Stability

Effect of solvent, temperature and pressure on the stability of chiral and perovskite metal formate frameworks of [NH2NH3][M(HCOO)3] (M = Mn, Fe, Zn)

2016 ◽  
Vol 18 (46) ◽  
pp. 31653-31663 ◽  
Author(s):  
Mirosław Mączka ◽  
Katarzyna Pasińska ◽  
Maciej Ptak ◽  
Waldeci Paraguassu ◽  
Tercio Almeida da Silva ◽  
...  
Keyword(s):  
Magnetic Order ◽  
Effect Of Solvent ◽  
Temperature And Pressure ◽  
The Stability ◽  
Metal Formate

Chiral [NH2NH3][Mn(HCOO)3] transforms into a polar P21 structure at 293 K and shows magnetic order below Tm = 9 K.

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

Effect of Improved ThO2 Particle Dispersion in Nickel on High-Temperature Strength

1970 ◽  
Vol 28 ◽  
pp. 444-445
Author(s):  
E. R. Kimmel ◽  
H. L. Anthony ◽  
W. Scheithauer
Keyword(s):  
High Temperature ◽  
Metal Matrix ◽  
Oxide Particle ◽  
Oxide Phase ◽  
Dislocation Motion ◽  
Particle Dispersion ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Oxide Particles ◽  
The Stability

The strengthening effect at high temperature produced by a dispersed oxide phase in a metal matrix is seemingly dependent on at least two major contributors: oxide particle size and spatial distribution, and stability of the worked microstructure. These two are strongly interrelated. The stability of the microstructure is produced by polygonization of the worked structure forming low angle cell boundaries which become anchored by the dispersed oxide particles. The effect of the particles on strength is therefore twofold, in that they stabilize the worked microstructure and also hinder dislocation motion during loading.

An Analysis of Dissociation of Molecules in a High Resolution Electron Microscope

1973 ◽  
Vol 31 ◽  
pp. 486-487
Author(s):  
Mihir Parikh
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Cross Sections ◽  
Resolving Power ◽  
Peak Intensity ◽  
Molecular Film ◽  
Resolution Electron ◽  
Dissociation Cross Section ◽  
High Resolution Electron Microscope ◽  
The Stability

It is well known that the resolution of bio-molecules in a high resolution electron microscope depends not just on the physical resolving power of the instrument, but also on the stability of these molecules under the electron beam. Experimentally, the damage to the bio-molecules is commo ly monitored by the decrease in the intensity of the diffraction pattern, or more quantitatively by the decrease in the peaks of an energy loss spectrum. In the latter case the exposure, EC, to decrease the peak intensity from IO to I’O can be related to the molecular dissociation cross-section, σD, by EC = ℓn(IO /I’O) /ℓD. Qu ntitative data on damage cross-sections are just being reported, However, the microscopist needs to know the explicit dependence of damage on: (1) the molecular properties, (2) the density and characteristics of the molecular film and that of the support film, if any, (3) the temperature of the molecular film and (4) certain characteristics of the electron microscope used

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