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Abstract
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Current modulation and rectification is an important subject of electronics as well as
spintronics. In this paper, an efficient rectifying mesoscopic device is introduced. The
device is a two terminal device on the 2D plane of electron gas. The lateral contacts
are half-metal ferromagnetic with antiparallel magnetizations and the central channel
region is taken as ferromagnetic or normal in the presence of an applied magnetic field.
The device functionality is based on the modification of spin-current by tuning the
strength of the magnetic field or equivalently by the exchange coupling of the channel to
the substrate. The result is that the (spin-) current depends on the polarity of the bias
voltage. Converting an alternating bias voltage to direct current is the main achievement
of this model device with an additional profit of rectified spin-current. We analyze the
results in terms of the spin-dependent barrier in the channel. Detecting the strength of
the magnetic field by spin polarization is also suggested
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