Comment on “Spin filtering in a magnetic–electric barrier structure” [Appl. Phys. Lett. 78, 2184 (2001)]

Spin filtering in a two-dimensional electron gas device with asymmetric spatially spread magnetic-electric barriers

“…(7) yields zero spin polarization. 20,21 For simplicity, the actual B field profile, which is shown schematically in Fig. 1(c), is approximated as square (tophat) functions [shown in Fig.…”

“…13 produces an antisymmetric B-field instead, which will result in zero spin polarization. 20,21 In this article, we calculate the spin-dependent transmission probability through a 2DEG with FM gate(s). We will incorporate the spatial spread of the B field and analyze the effect of the asymmetry of the magnetoelectric barriers on the spin polarization property of the device.…”

Electron transport in a two-dimensional electron gas modulated by one ferromagnetic stripe and two Schottky metal stripes

“…This device has been widely investigated, and many interesting results were obtained [21][22][23]. However, recent computations have shown that there is no spin polarization in a 2DEG modulated by a magnetic field with an antisymmetric profile [24,25].…”

The magnetoresistance effect in a nanostructure with the periodic magnetic barriers

“…The magnetic field is created by the deposition, on top of the heterostructure, of two parallel metallic ferromagnetic strips. This has been investigated in detail by several authors [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”