Electron spin polarization of secondary electrons ejected from magnetized europium oxide

It is found that secondary electrons ejected (by incident 1 keV electrons) from an oxidized europium layer, which is at about 20 K in a magnetic field of 1.5 T, show longitudinal spin polarization. The maximum value observed in first experiments is 32 per cent.     

Landau quantization and spin polarization of cold magnetized quark matter

The magnetic field and density behaviors of various thermodynamic quantities of strange quark matter under compact star conditions are investigated in the framework of the thermodynamically self-consistent quasiparticle model. For individual species, a larger number density \begin{document}$ n_i $\end{document} leads to a larger magnetic field strength threshold that aligns all particles parallel or antiparallel to the magnetic field. Accordingly, in contrast to the finite baryon density effect which reduces the spin polarization of magnetized strange quark matter, the magnetic field effect leads to an enhancement of it. We also compute the sound velocity as a function of the baryon density and find the sound velocity shows an obvious oscillation with increasing density. Except for the oscillation, the sound velocity grows with increasing density, similar to the zero-magnetic field case, and approaches the conformal limit \begin{document}$ V_s^2=1/3 $\end{document} at high densities from below.     

Plunger measurements on highly stripped O-ions as tool for detecting electron polarization on emergence from thin ferromagnetic layers

From hyperfine interaction studles on free single electron¹⁶O(3⁻) ions. in a time differential mode using the recoil distance technique. It is shown that these ions are polarized when emerging from magnetized thin layers of Fe. The observed degree of polarization , however, is smaller than expected from transient field measurements.     

A scheme for electrical detection of single-electron spin resonance

We study a scheme for electrical detection of the spin resonance of a single-electron trapped near a field effect transistor (FET) conduction channel. In this scheme, the resonant Rabi oscillations of the trapped electron spin cause a modification of the average charge of a shallow trap, which can be detected through the change in the FET channel resistivity. We show that the dependence of the channel resistivity on the frequency of the rf field can have either peak or dip at the Larmor frequency of the electron spin in the trap.     

Experimental study of longitudinal and transverse spin polarization in LEED from platinum (111)

Zeitschrift für Physik B Condensed Matter - In LEED from the (111) surface of platinum the dependence of the spin polarization on the polar angle ϑ and the azimuthal angle φ in the...     

Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven nanocontacts

Through detailed experimental studies of the angular dependence of spin wave excitations in nanocontact-based spin-torque oscillators, we demonstrate that two distinct spin wave modes can be excited, with different frequency, threshold currents, and frequency tunability. Using analytical theory and micromagnetic simulations we identify one mode as an exchange-dominated propagating spin wave, and the other as a self-localized nonlinear spin wave bullet. Wavelet-based analysis of the simulations indicates that the apparent simultaneous excitation of both modes results from rapid mode hopping induced by the Oersted field.     

Polarized x-ray emission from magnetized neutron stars: signature of strong-field vacuum polarization

In the atmospheric plasma of a strongly magnetized neutron star, vacuum polarization can induce a Mikheyev-Smirnov-Wolfenstein type resonance across which an x-ray photon may (depending on its energy) convert from one mode into the other, with significant changes in opacities and polarizations. We show that this vacuum resonance effect gives rise to a unique energy-dependent polarization signature in the surface emission from neutron stars. The detection of polarized x rays from neutron stars can provide a direct probe of strong-field quantum electrodynamics and constrain the neutron star magnetic field and geometry.     

Effect of polarization on a spin particle trajectory

It is demonstrated that the problem of determining the parameters of trajectories of spin particles and beam of rays in the case of radiation with allowance for polarization is reduced to a variational problem with higher derivatives. It is demonstrated that in the limit of small values of the curvature and torsion, the higher derivatives can be expressed through the parameters of the medium. In this case, the curvature and torsion together with the polarization projection onto the trajectory determine an analog of the 4-potential which in its turn specifies an analog of the electromagnetic field tensor where the projection of polarization onto the trajectory plays the role of charge for a charged particle. It is demonstrated that the Magnus optical effect for dissipative solitons is determined not only by helicity σ, but also by topological index m (by the projection of the orbital soliton momentum onto the soliton trajectory). In an inhomogeneous medium, a relationship between the Magnus optical effect and nonholonomicity of the field of unit vectors tangent to the trajectory is established.     

Classification of single-electron states in a crystal on the basis of spin space groups

It is shown that the symmetry of single-electron Hamiltonians, used traditionally in computations of the band structure of magnetically ordered crystals, is described completely by spin space groups for which independent transformations of the magnetic moment and lattice are allowable, to taking account of the spin-orbit interaction which yields a contribution to the energy of the magnetic anisotropy, the symmetry of the Hamiltonian is de scribed by a magnetic group, which is a subgroup of the spin space group. Cases of paramagnetic, ferromagnetic, and antiferro-magnetic crystals are discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 20–25, September, 1979.     

可见光条纹相机可靠性实验研究

基于晨光号X光机开展了可见光条纹相机在复杂的辐射/电磁环境中的可靠性实验研究。利用序列脉冲激光的成像状态表征条纹相机的扫描状态,采取了不同的辐射/电磁防护措施,研究其对扫描状态的影响。实验研究获得了该类相机在此类复杂环境中正常工作的防护方法,主要包括增强辐射屏蔽使条纹相机附近的单发次等效空气吸收剂量不超过6μGy、减少相机机壳的缝隙、采取光电隔离的触发方式等。     

激光偏振状态对磁化等离子体中电磁孤波的影响

强激光与等离子体之间相互作用,能够产生各种参量不稳定性过程和非线性效应。利用Karpman方法推导出横场包络所满足的非线性控制性方程,在一维情况下,获得孤波解。对孤波解进行分析,发现波包孤子的半宽反比于振幅;分析磁化等离子体中各参量对孤波半宽的影响。结果表明,在右旋圆偏振激光情况下,随着电子数密度的增大,孤波的半宽逐渐减小,而当磁场强度增大时,孤波的半宽逐渐增大;在左旋圆偏振激光情况下,随着电子数密度的增大,孤波的半宽逐渐增大,而当磁场强度增大时,孤波的半宽逐渐减小。     

Relativistic polarization density matrix for particles of arbitrary spin

The polarization density matrix for particles of arbitrary spin can be expressed as a linear function of the expectation values of the generators of the polarization symmetry group of the corresponding wave equations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 84–88, April, 1984.     

Rigorous spin tests from angular distribution of single two-body decays

We extend to the several-amplitude decays j→j₁+j₂, (j?j₁+j₂,j₁+j₂?2) the rigorous spin tests given by Doncel, Michel and Minnaert for the usual one-amplitude strong decays, in quadrupole and quadrupole-hexadecapole spaces. We also derive spin tests in dipole-quadrupole space for the parity violating decays $\text{j →}\text{1}\text{2}\text{0}\text{and}\text{j →}\text{1}\text{2}\text{1}\text{2}$.     

Experimental observation of radiation from cherenkov wakes in a magnetized plasma

A proof-of-principle experiment demonstrates the generation of radiation from the Cherenkov wake excited by an ultrashort- and ultrahigh-power pulse laser in a perpendicularly magnetized plasma. The frequency of the radiation is in the millimeter range (up to 200 GHz). The intensity of the radiation is proportional to the magnetic field intensity as expected by theory. Polarization of the emitted radiation is also detected. The difference in the frequency of the emitted radiation between these experiments and previous theory can be explained by the electrons' oscillation in the electric field of a narrow column of ions in the focal region.     

Controlling the spin polarization of nanostructures on magnetic substrates

It is shown that, by utilizing spin-selective quantum interference, the spin polarization of nanostructures deposited on a magnetic substrate with a surface state can be strongly modulated locally and energetically by an appropriate structural design. This finding is deduced from state-of-the-art ab initio calculations and interpreted within an analytical model. We present results for hexagonal Cu corrals and mesoscopic triangular Co islands on Co-covered Cu(111). These systems are experimentally feasible, and the effect should be detectable with current technology.     

Effect of ion polarization drift on shielding and dynamical potentials in magnetized plasmas

The role of an external magnetic field via the ion polarization drift effect has been investigated theoretically on the dust-Coulomb crystal formation in a dusty plasma in the presence of continuous ion flows from the bulk plasma to the sheath. The effects of the ions polarization drift on the strength and the effective lengths of the static Debye shielding potential and the oscillatory dynamical potential are clearly demonstrated.     

Structure of the spin polarization spectrum of secondary electrons emitted from nickel

The main features of the structure observed in the energy resolved spin polarization of secondary electrons emitted from Ni are interpreted in terms of surface and bulk plasmon assisted emission. The model also predicts a measurable shift of the main polarization peak of about 0.3 eV to lower energies as the temperature is raised from room temperature to closely below the Curie temperature.