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![[Figure 1]](pp5170fig1mag.jpg)
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Figure 1
Working principle of spin filter in transmission geometry. (a) Ultrathin magnetic film preferentially transmits electrons with a parallel incident spin direction with respect to the magnetization orientation. For a given magnetization, an asymmetry between the transmitted currents I↑ and I↓ is measured (Oberli et al., 1998  ; Lassailly et al., 1994). (b) Scheme of the three-terminal hybrid device. The emitter provides spin-polarized free electrons. The electrons are injected into the FM-SC junction. Base (FM) and collector (SC) currents are separately detected (Filippe et al., 1998; Tereshchenko et al., 2011). In the magnetic layer, the relaxation is different for majority and minority spin electrons leading to two different distributions N(ε) at the junction. The SHB at the interface plays the selector role for two electron energy distributions. (c) By changing the n-type to p-type semiconductor, optical detection of injected electrons becomes possible (Li et al., 2014). The interface barrier Φb in this case is the difference between the conduction band minimum in the bulk and the Fermi level, and also acts as the selector between majority and minority spin-polarized injected electrons. |
![[Figure 1]](pp5170fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
