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The dynamics of a spin-torque-oscillator (STO) coupled with a nano-magnetthrough dipole-dipole interaction was studied numerically by using themacrospin model for the application of the STO as a read head sensor of harddisk drives. We found that the current, which is required to induce theoscillation of the free-layer (FL) of the STO, depends strongly on the distancebetween the FL and the nano-magnet as well as on the relative orientation ofthe magnetizations between them. To determine the dynamics of the STO it isindispensable to consider the dynamics of the dipole-coupled nano-magnet. Weshowed that we could detect the orientation of the magnetization of anano-magnet, or a recording-bit, by the modulation of the oscillation frequencyof the STO.

Theoretical study of spin-torque oscillator coupled with a nano-magnet by dipole-dipole interaction