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We use micromagnetic simulation to demonstrate layer-selective detection ofmagnetization directions from magnetic dots having two recording layers byusing a spin-torque oscillator (STO) as a read device. This method is based onferromagnetic resonance (FMR) excitation of recording-layer magnetizations bythe microwave field from the STO. The FMR excitation affects the oscillation ofthe STO, which is utilized to sense the magnetization states in a recordinglayer. The recording layers are designed to have different FMR frequencies sothat the FMR excitation is selectively induced by tuning the oscillationfrequency of the STO. Since all magnetic layers interact with each otherthrough dipolar fields, unnecessary interlayer interferences can occur, whichare suppressed by designing magnetic properties of the layers. We move the STOover the magnetic dots, which models a read head moving over recording media,and show that changes in the STO oscillation occur on the one-nanosecondtimescale.

journal of magnetism and magnetic materials

Layer-selective detection of magnetization directions from two layers of  antiferromagnetically-coupled magnetizations by ferromagnetic resonance using  a spin-torque oscillator