(jefferson laboratory) require highly polarized electron beams, often at high average current spin-polarized electrons are produced by photoemission from various gaas-based semiconductor photo-cathodes, using circularly polarized laser light with photon energy slightly larger than the semiconductor band gap. In this thesis we developed microfabricated spin polarized atomic magnetometers these sensors are based on optical pumping and spin-exchange collisions between alkali atoms and noble gases contained in microfabricated millimeter-scale vapor cells. Hybrid structures with magnetic and superconducting correlations norwegian university of science and technology abstract in this thesis we theoretically examine spin-polarized non-local transport in two we ﬁnd that such systems can generate a spin-polarized non-local current even when.
Spin polarization is the degree to which the spin, ie, the intrinsic angular momentum of elementary particles, is aligned with a given direction this property may pertain to the spin, hence to the magnetic moment , of conduction electrons in ferromagnetic metals , such as iron , giving rise to spin-polarized currents. When a current is said to be spin-polarized, it means most of the electrons are either spin-up or spin-down figure 1 the first two demonstration of gmr effect. When a temperature gradient is along the wire, then a thermally induced spin-polarized current, that is, charge current accompanied by a spin current, can flow along the wire when magnetic moments of the two ferromagnetic parts are not collinear, then the component of spin current perpendicular to the magnetization of a particular magnetic.
Spin dependent current injection into epitaxial graphene nanoribbons approved by: dr walt a de heer, advisor school of physics georgia institute of technology. Spin-transfer torque, where a current of spin-polarized electrons is used to control the magnetization direction of ferromagnetic electrodes in the device spin-wave logic devices carry information in the phase. The light generated a spin polarized current perpendicular to the laser beam, even when the beam hit at an oblique angle the direction of current showed that although the laser imparts angular momentum (spin) to the electrons, it does not provide any linear momentum.
Imaging spin properties using spatially varying magnetic fields honors research thesis achieving an understanding of spin-polarized transport in the research presented in this thesis aims to move current spintronics technology.
Spin polarized current generation from quantum dots without magnetic fields (article begins on next page) the harvard community has made this article openly available.