| AVS 64th International Symposium & Exhibition | |
| Nanometer-scale Science and Technology Division | Tuesday Sessions |
| Session NS+EM+MI+SS-TuM |
| Session: | Nanoscale Electronics and Magnetism |
| Presenter: | Yun Daniel Park, Seoul National University, Republic of Korea |
| Authors: | S.U. Cho, Seoul National University M. Jo, Seoul National University S. Park, Seoul National University J.-H. Lee, Seoul National University C. Yang, Seoul National University S. Kang, Seoul National University Y.D. Park, Seoul National University, Republic of Korea |
| Correspondent: | Click to Email |
Heat dissipation in current-driven ferromagnetic resonance (FMR) system is characterized by monitoring the mechanical resonance, which shifts are governed by thermoelastic properties. Realization of a free-standing Permalloy (Py)/Pt bilayer strip, with an added mechanical degree of freedom, advantageously integrates means to separately measure mechanical resonance, by piezoresistive transduction in Pt [1], and FMR by using the spin-torque FMR (ST-FMR) measurement technique [2]. Heat generated by the precessing magnetization under an electric driving current are selectively investigated by monitoring the mechanical resonance shift, which are immune and independent to thermoelectric effects. By comparing the angular dependence to the applied magnetic field direction of the two FMR spectroscopies, ST-FMR and mechanical heat reaction, we find that Joule heat resulting from a time-dependent magnetoresistance, which in turn arises from the precessing magnetization and electrical current, cannot be overlooked in addition to the intrinsic FMR heat dissipation.
[1] H. Bhaskaran et al. Appl. Phys. Lett. 98, 013502 (2011).
[2] L. Liu et al., Phys. Rev. Lett. 106, 036601 (2011).