Electron-Spin Polarization in Tunnel Junctions with Ferromagnetic EuS Barriers

1989 ◽  
Vol 151 ◽  
Author(s):  
Xin Hao ◽  
J. S. Moodera ◽  
R. Meservey
Keyword(s):  
Curie Temperature ◽  
Spin Polarization ◽  
Electron Spin ◽  
Tunnel Junctions ◽  
Zeeman Splitting ◽  
Aluminum Film ◽  
Electron Spin Polarization ◽  
Magnetic Polarization ◽  
Tunnel Current ◽  
Metal Electrodes

ABSTRACTSpin-resolved tunneling in the structure metal-EuS-metal has been obtained. The metal electrodes used in our experiments being non-magnetic, polarization of the tunnel current is attributed to the conduction band splitting in EuS below its ferromagnetic Curie temperature. Enhanced Zeeman splitting in the superconducting aluminum film is also observed.

Effects on the magnetic and optical properties of Co-doped ZnO at different electronic states

2017 ◽  
Vol 31 (31) ◽  
pp. 1750247
Author(s):  
Qingyu Huo ◽  
Zhenchao Xu ◽  
Linfeng Qu
Keyword(s):  
Absorption Spectrum ◽  
Spin Polarization ◽  
Electron Spin ◽  
Magnetic Moments ◽  
The State ◽  
Band Gaps ◽  
Electron Spin Polarization ◽  
Approximation Formula ◽  
Doped Zno ◽  
Co Doped

Both blue and red shifts in the absorption spectrum of Co-doped ZnO have been reported at a similar concentration range of doped Co. Moreover, the sources of magnetism of Co-doped ZnO are controversial. To solve these problems, the geometry optimization and energy of different Co-doped ZnO systems were calculated at the states of electron spin polarization and nonspin polarization by adopting plane-wave ultra-soft pseudopotential technology based on density function theory. At the state of electron nonspin polarization, the total energies increased as the concentration of Co-doped increased. The doped systems also became unstable. The formation energies increased and doping became difficult. Furthermore, the band gaps widened and the absorption spectrum exhibited a blue shift. The band gaps were corrected by local-density approximation + [Formula: see text] at the state of electron spin polarization. The magnetic moments of the doped systems weakened as the concentration of doped Co increased. The magnetic moments were derived from the coupling effects of [Formula: see text]–[Formula: see text]. The band gaps narrowed and the absorption spectrum exhibited a red shift. The inconsistencies of the band gaps and absorption spectrum at the states of electron spin polarization and nonspin polarization were first discovered in this research, and the sources of Co-doped ZnO magnetism were also reinterpreted.

Contribution of vitamin K1 to the electron spin polarization in spinach photosystem I

Biochemistry ◽  
1990 ◽  
Vol 29 (35) ◽  
pp. 8030-8032 ◽  
Author(s):  
Richard R. Rustandi ◽  
Seth W. Snyder ◽  
Laura L. Feezel ◽  
Tomasz J. Michalski ◽  
James R. Norris ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Photosystem I ◽  
Electron Spin Polarization ◽  
Vitamin K1
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