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Spin torque in uniform magnetization
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This chapter discusses the effects of a spin current injected into a uniformly magnetized ferromagnetic cell. The junction consists of two ferromagnetic layers separated by a nonmagnetic metal interlayer or insulating barrier layer. With a nonmagnetic metal interlayer, the junction is called a giant magnetoresistive nanopillar, and with an insulating barrier layer a magnetic-tunnel junction. When charge current is passed through this device, the electrons are first spin polarized by the fixed layer and spin-polarized current is then injected into the free layer through the nonmagnetic interlayer. This spin current interacts with the spins in the host material by an exchange interaction and exerts a torque. If the exerted torque is large enough, magnetization in the free layer is reversed or continuous precession is excited.
Title: Spin torque in uniform magnetization
Description:
This chapter discusses the effects of a spin current injected into a uniformly magnetized ferromagnetic cell.
The junction consists of two ferromagnetic layers separated by a nonmagnetic metal interlayer or insulating barrier layer.
With a nonmagnetic metal interlayer, the junction is called a giant magnetoresistive nanopillar, and with an insulating barrier layer a magnetic-tunnel junction.
When charge current is passed through this device, the electrons are first spin polarized by the fixed layer and spin-polarized current is then injected into the free layer through the nonmagnetic interlayer.
This spin current interacts with the spins in the host material by an exchange interaction and exerts a torque.
If the exerted torque is large enough, magnetization in the free layer is reversed or continuous precession is excited.
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