High Spin-Torque Diode Sensitivity In Cofeb/Mgo/Cofeb Magnetic Tunnel Junctions Under Dc Bias Currents
IEEE TRANSACTIONS ON MAGNETICS(2011)
Abstract
We report a large enhancement of spin-torque diode sensitivity in CoFeB/MgO/CoFeB magnetic tunnel junctions measured under perpendicular magnetic fields and dc bias currents. In the measurement of homodyne detection, a large dc output voltage of 190 mu V was obtained when an RF signal power of -30 dB m and a dc current of +1.0 mA were applied. This value corresponds to the diode sensitivity of 190 mV/mW (260 mV/mW after impedance matching correction). The main origin of this enhancement is an offset of the damping torque and an increase in the precession angle induced by the spin-transfer torque due to the dc bias current application.
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Key words
Magnetoresistance effect, MgO-based magnetic tunnel junctions (MTJs), spin-torque diode effect, spin-torque diode sensitivity
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