Spin-torque ac impedance in magnetic tunnel junctions
Silas Hoffman, Pramey Upadhyaya, Yaroslav Tserkovnyak
TL;DR
This paper investigates how the ac impedance of magnetic tunnel junctions, affected by spin currents and magnetic precession, can be used to characterize magnetic states and coupling in the device.
Contribution
It introduces a method to measure the ac impedance of MTJs to infer magnetic configurations and coupling effects, providing a new characterization technique.
Findings
Impedance varies with magnetic field and precession.
Impedance measurement can distinguish magnetic states.
Potential for improved magnetic sensor design.
Abstract
Subjecting a magnetic tunnel junction (MTJ) to a spin current and/or electric voltage induces magnetic precession, which can reciprocally pump current through the circuit. This results in an ac impedance, which is sensitive to the magnetic field applied to the MTJ. Measuring this impedance can be used to characterize the coupling between the magnetic free layer and the electric current as well as a read-out of the magnetic configuration of the MTJ.
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