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A possibility to excite a stable self-oscillation in a perpendicularlymagnetized ferromagnet by the spin Hall effect is investigated theoretically.It had been shown that such self-oscillation cannot be stabilized solely by thedirect spin torque by the spin Hall effect. Here, we consider adding anotherferromagnet, referred to as pinned layer, on the free layer. The pinned layerprovides another spin torque through the reflection of the spin current. Thestudy shows that the stable self-oscillation is excited by the additional spintorque when the magnetization in the pinned layer is tilted from the filmplane.

Indirect excitation of self-oscillation in perpendicular ferromagnet by spin Hall effect