Abstract
The magnetic resonance of Fe nanoparticles has been observed in single-crystal Fe/MgO/Fe magnetic tunnel junctions (MTJs). In the MTJs, one magnetic layer is a continuous Fe film, which acts as a magnetic reference layer, and the other is made up of noncontinuous nanoparticles of Fe, which act as a free layer. The magnetic resonance is electrically excited by the spin torque and is detected as the homodyne detection voltage, which is called the spin-torque diode effect. From the magnetoresistance characteristics, the average diameter of the Fe nanoparticles is estimated to be 6.8 nm; these nanoparticles exhibit superparamagnetic behavior at room temperature. This spin-torque magnetic resonance in magnetic nanoparticles enables us to study the magnetization dynamics in small spin systems.
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