Dynamic particle-spin orientation in a cosmic medium

Astrophysics ◽  
1970 ◽  
Vol 4 (4) ◽  
pp. 215-221 ◽  
Author(s):  
D. A. Varshalovich
Keyword(s):  
Spin Orientation ◽  
Particle Spin ◽  
Cosmic Medium

Magnetism of Alkalitetrafluoromanganates (III) AMnF4 (A = K, Rb, Cs): Neutron Diffraction, Mössbauer and Magnetization Investigations

1993 ◽  
Vol 48 (11) ◽  
pp. 1054-1072 ◽  
Author(s):  
Michel Molinier ◽  
Christoph Frommen ◽  
Werner Massa ◽  
Jürgen Pebler ◽  
Thierry Roisnel
Keyword(s):  
Neutron Diffraction ◽  
Magnetic Hyperfine Field ◽  
Thermal Excitation ◽  
Spin Orientation ◽  
Domain Wall Dynamics ◽  
Out Of Plane ◽  
Exponential Temperature Dependence ◽  
Jahn Teller ◽  
Magnetic Spin ◽  
Ordered Layers

Abstract The magnetic properties of the d4 Jahn-Teller systems AIMnIIIF4 with layered structures were investigated. Neutron diffraction on powders of KMnF4 and RbMnF4 revealed different antiferro-magnetic spin arrangements below TN = 4.5 K and 2.3 K, respectively: for KMnF4 canted antiparallel along a and b, for RbMnF4 parallel along a and antiparallel along b, in both cases parallel along c, the stacking direction of layers. Mössbauer investigations on 57Fe doped KMnF4 confirmed a spin orientation approximately within the layer plane. A discussion is given of the contributions to the magnetic hyperfine field and the Mössbauer linewidth in quasi-two-dimensional antiferromagnets with Ising anisotropy due to thermal excitation of domain wall dynamics (solitons). The experimental data seem to confirm the predicted exponential temperature dependence of the linewidth. From magnetization measurements on powders and a single crystal of KMnF4 the 2-d exchange energy and the out-of-plane and in-plane anisotropies could be extracted. In addition, from susceptibility measurements the exchange energies of NaMnF4 , RbMnF4 and CsMnF4 were calculated. A linear dependence of these exchange energies (positive for ferromagnetic CsMnF4 , negative for the other AMnF4 compounds) on the cos2 of the Mn-F-Mn bridge angle is observed and compared with the behaviour of the AFeF4 compounds which is also linear but with reverse sign of the slope. The specific superexchange mechanisms active in Jahn-Teller systems with antiferrodistortively ordered layers are suggested to be responsible for these findings.

Flow Past a Spinning Sphere With Surface Blowing and Heat Transfer

2005 ◽  
Vol 127 (1) ◽  
pp. 163-171 ◽  
Author(s):  
H. Niazmand ◽  
M. Renksizbulut
Keyword(s):  
Heat Transfer ◽  
Three Dimensional ◽  
Flow Regimes ◽  
Solid Sphere ◽  
Temporal Variations ◽  
Transfer Coefficients ◽  
Transfer Rates ◽  
Particle Spin ◽  
Flow Past ◽  
Angular Velocities

Computations are performed to determine the transient three-dimensional heat transfer rates and fluid forces acting on a stream-wise spinning sphere for Reynolds numbers in the range 10⩽Re⩽300 and angular velocities Ωx⩽2. In this Re range, classical flow past a solid sphere develops four different flow regimes, and the effects of particle spin are studied in each regime. Furthermore, the combined effects of particle spin and surface blowing are examined. Sphere spin increases drag in all flow regimes, while lift shows a nonmonotonic behavior. Heat transfer rates are not influenced by spin up to a certain Ωx but increase monotonically thereafter. An interesting feature associated with sphere spin is the development of a special wake regime such that the wake simply spins without temporal variations in its shape. For this flow condition, the magnitudes of the lift, drag, and heat transfer coefficients remain constant in time. Correlations are provided for drag and heat transfer.

The classification of two-particle spin states and generalized Bell inequalities

2001 ◽  
Vol 281 (5-6) ◽  
pp. 278-288 ◽  
Author(s):  
V.A. Andreev ◽  
V.I. Man'ko
Keyword(s):  
Bell Inequalities ◽  
Spin States ◽  
Particle Spin

scholarly journals Off-axis spin orientation in goethite nanoparticles

2017 ◽  
Vol 96 (10) ◽  
Author(s):  
Erik Brok ◽  
Kim Lefmann ◽  
Gøran Jan Nilsen ◽  
Mathias Kure ◽  
Cathrine Frandsen
Keyword(s):  
Spin Orientation

Optical spin orientation in group-IV heterostructures

2013 ◽  
Vol 113 (17) ◽  
pp. 17C504 ◽  
Author(s):  
Alberto Ferrari ◽  
Federico Bottegoni ◽  
Stefano Cecchi ◽  
Giovanni Isella ◽  
Franco Ciccacci
Keyword(s):  
Group Iv ◽  
Spin Orientation

Spin orientation in rotating nuclei

1987 ◽  
Vol 196 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Hans Frisk ◽  
Ragnar Bengtsson
Keyword(s):  
Spin Orientation ◽  
Rotating Nuclei
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