scholarly journals Spin dynamics and structure formation in a spin-1 condensate in a magnetic field

2009 ◽  
Vol 79 (6) ◽  
Author(s):  
Jordi Mur-Petit
Keyword(s):  
Magnetic Field ◽  
Structure Formation ◽  
Spin Dynamics

MAGNETOSTATIC MODES IN NANOMETER-SIZED FERROMAGNETIC AND ANTIFERROMAGNETIC TUBES

2007 ◽  
Vol 14 (03) ◽  
pp. 471-480 ◽  
Author(s):  
T. K. DAS ◽  
M. G. COTTAM
Keyword(s):  
Magnetic Field ◽  
Spin Dynamics ◽  
Continuum Theory ◽  
Inelastic Light Scattering ◽  
Dipole Interactions ◽  
Large Length ◽  
Magnetostatic Modes ◽  
Magnetostatic Spin Waves ◽  
Macroscopic Continuum ◽  
Cylindrical Axis

A theory is presented for the magnetostatic modes in ferromagnetic and antiferromagnetic nanotubes, which have a large length-to-radius aspect ratio and an external magnetic field parallel to the cylindrical axis. The surface and bulk magnetic excitations (or magnetostatic spin waves) are studied for cases where the dipole–dipole interactions are dominant in the spin dynamics. This situation can be realized at sufficiently small wavevectors by inelastic light scattering or magnetic resonance techniques. A macroscopic continuum theory is developed, using the magnetostatic form of Maxwell's equations and the electromagnetic boundary conditions, and the characteristic equations (or dispersion relations) are deduced for the magnetostatic modes. Numerical calculations are presented for ferromagnetic and antiferromagnetic nanostructures, taking Ni 80 Fe 20 and MnF 2, respectively. The spatial variations of the mode amplitudes are also investigated.

Magnetic ground state of low-doped manganites probed by spin dynamics under magnetic field

2004 ◽  
Vol 272-276 ◽  
pp. 1784-1786 ◽  
Author(s):  
P. Kober ◽  
M. Hennion ◽  
F. Moussa ◽  
A. Ivanov ◽  
L.-P. Regnault ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ground State ◽  
Spin Dynamics ◽  
Magnetic Ground State ◽  
Doped Manganites

scholarly journals Spin transport and spin dynamics in antiferromagnets

2021 ◽  
Author(s):  
◽  
Geert Hoogeboom
Keyword(s):  
Magnetic Field ◽  
Heavy Metal ◽  
Spin Transport ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Spin Current ◽  
Active Role ◽  
Metal Films ◽  
Alternating Direction ◽  
High Processing

Ferromagnets (FMs) have been a key ingredient in information technology because it is easy to manipulate and read out the magnetization. Antiferromagnets (AFMs) have magnetic moments with alternating direction resulting in negligible magnetization. This gives them high processing and device downscaling features, but this also makes it challenging to manipulate and interact with the AFM order. This thesis studies this interaction with antiferromagnets. NiO AFM order has been read out by electrically injecting spin current via the spin Hall effect in thin heavy metal films. In DyFeO3, both Dy and Fe magnetic moments, their excitation and interaction have been probed. A magnetic field lifts the degeneracy of magnetic excitations with opposite magnon spin, allowing a spin current to be detected nonlocally. The AFM order and the generation of spin current can easily be controlled by an adjacent FM. Thereby, we show that AFMs have the potential to play an active role in spintronics.

scholarly journals Exploration of the close chemical space of tryptophan and tyrosine reveals importance of hydrophobicity in CW-photo-CIDNP performances

2021 ◽  
Vol 2 (1) ◽  
pp. 321-329
Author(s):  
Felix Torres ◽  
Alois Renn ◽  
Roland Riek
Keyword(s):  
Magnetic Field ◽  
Nuclear Polarization ◽  
Continuous Wave ◽  
Radical Pair ◽  
Chemical Space ◽  
Spin Dynamics ◽  
Basic Mechanism ◽  
Chemical Library ◽  
Chemically Induced ◽  
Small Chemical

Abstract. Sensitivity being one of the main hurdles of nuclear magnetic resonance (NMR) can be gained by polarization techniques including chemically induced dynamic nuclear polarization (CIDNP). Kaptein demonstrated that the basic mechanism of the CIDNP arises from spin sorting based on coherent electron–electron nuclear spin dynamics during the formation and the recombination of a radical pair in a magnetic field. In photo-CIDNP of interest here the radical pair is between a dye and the molecule to be polarized. Here, we explore continuous-wave (CW) photo-CIDNP (denoted CW-photo-CIDNP) with a set of 10 tryptophan and tyrosine analogues, many of them newly identified to be photo-CIDNP active, and we observe not only signal enhancement of 2 orders of magnitude for 1H at 600 MHz (corresponding to 10 000 times in measurement time) but also reveal that polarization enhancement correlates with the hydrophobicity of the molecules. Furthermore, the small chemical library established indicates the existence of many photo-CIDNP-active molecules.

scholarly journals Спиновая динамика отрицательно заряженных экситонов в квантовых точках InP/(In,Ga)P в магнитном поле

2020 ◽  
Vol 62 (11) ◽  
pp. 1816
Author(s):  
С.В. Некрасов ◽  
Ю.Г. Кусраев ◽  
И.А. Акимов ◽  
L. Langer ◽  
M. Kotur ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Circular Polarization ◽  
Ground State ◽  
Heavy Hole ◽  
Spin Dynamics ◽  
Nuclear Spins ◽  
Time Resolved ◽  
Exciton Ground State ◽  
Charged Exciton

The dynamics of the photoluminescence negative circular polarization of the InP/(In,Ga)P quantum dots ensemble was studied. We find that in the time-resolved dependences of the polarization there are no oscillations in Voigt magnetic field. Also, with increasing field the polarization declines to zero. Such behavior is attributed to the peculiarities of the negatively charged exciton spin dynamics, particularly, to the fact that in the negatively charged exciton ground state the spin dynamics is governed by the heavy hole. We show that magnetic field depolarization of the photoluminescence occurs once the field of dynamically polarized nuclear spins acting on electron spins is surpassed.

Spin dynamics and absorption-band profiles for the planar two-dimensional easy-plane ionic ferromagnet Rb 2 CrCl 4

1988 ◽  
Vol 415 (1849) ◽  
pp. 277-302 ◽  
Keyword(s):  
Magnetic Field ◽  
Spin Dynamics ◽  
Optical Data ◽  
Planar Anisotropy ◽  
Eigenvalues And Eigenfunctions ◽  
Experimental Conditions ◽  
Anisotropy Parameters ◽  
Combination Bands ◽  
First Time ◽  
Crystallographic Axes

Eigenvalues and eigenfunctions of the spin waves in Rb 2 CrCl 4 , in the absence or presence of a magnetic field oriented along (or slightly off) one of the major crystallographic axes, are given in detail for the first time. We present a simple model to simulate the profiles of exchange induced exciton-magnon combination bands in canted ferromagnets, under various experimental conditions of temperature and magnetic field. This model is used to analyse new high-resolution magneto-optical data at low and very low (0.35 K) temperatures and to derive precise anisotropy parameters. It can be applied with only slight modifications to metamagnets showing axial or planar anisotropy.

scholarly journals Spin dynamics triggered by subterahertz magnetic field pulses

2008 ◽  
Vol 103 (12) ◽  
pp. 123905 ◽  
Author(s):  
Zhao Wang ◽  
Matthäus Pietz ◽  
Jakob Walowski ◽  
Arno Förster ◽  
Mihail I. Lepsa ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Dynamics
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