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Spin-torque Magnetic Resonance of Fe Nanoparticles in Fe/MgO/Fe Magnetic Tunnel Junctions
S. Miwa,N. Mizuochi,T. Shinjo,Y. Suzuk,S. Kim,Y. Jo,박승영 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetic resonance of Fe nanoparticles has been observed in single-crystal Fe/MgO/Fe magnetictunnel junctions (MTJs). In the MTJs, one magnetic layer is a continuous Fe film, whichacts 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 andis detected as the homodyne detection voltage, which is called the spin-torque diode effect. Fromthe magnetoresistance characteristics, the average diameter of the Fe nanoparticles is estimatedto be 6.8 nm; these nanoparticles exhibit superparamagnetic behavior at room temperature. Thisspin-torque magnetic resonance in magnetic nanoparticles enables us to study the magnetizationdynamics in small spin systems.