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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M. N. Baibich, J. M. Broto, A. Fert, F. Nguyen, V. Dau and F. Petroff, Phys. Rev. Lett. 61, 2472 (1988).
L. Berger, Phys. Rev. B 54, 9353 (1996).
J. C. Slonczewski, J. Magn. Magn. Mater. 159, L1 (1996).
E. B. Myers, D. C. Ralph, J. A. Katine, R. A. Louie and R. A. Buhrman, Science 285, 867 (1999).
M. Tsoi, A. G. M. Jansen, J. Bass, W. Chiang, M. Seck, V. Tsoi and P. Wyder, Phys. Rev. Lett. 80, 4281 (1998).
S. I. Kiselev, J. C. Sankey, I. N. Krivorotov, N. C. Emley, R. J. Schoelkopf, R. A. Buhrman and D. C. Ralph, Nature 425, 380 (2003).
A. A. Tulapurkar, Y. Suzuki, A. Fukushima, H. Kubota, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe and S. Yuasa, Nature 438, 339 (2005).
J. C. Sankey, P. M. Braganca, A. G. F. Garcia, I. N. Krivorotov, R. A. Buhrman and D. C. Ralph, Phys. Rev. Lett. 96, 227601 (2006).
K. Yakushiji, F. Ernult, H. Imamura, K. Yamane, S. Mitani, K. Takanashi, S. Takahashi and H. Fujimori, Nature Mater. 4, 57 (2004).
S. Tomita, K. Akamatsu, H. Shinkai, S. Ikeda, H. Nawafune, C. Mitsumata, T. Kashiwagi and M. Hagiwara, Phys. Rev. B 71, 180414 (2005).
S. Mitani, S. Takahashi, K. Takanashi, K. Yakushiji, S. Maekawa and H. Fujimori, Phys. Rev. Lett. 81, 2799 (1998).
S. Miwa, M. Shirashi, M. Mizuguchi, T. Shinjo and Y. Suzuki, Jpn. J. Appl. Phys. 45, L717 (2006).
S. Sakai, K. Yakushiji, S. Mitani, K. Takanashi, H. Naramoto, P. V. Avramov, K. Narumi, V. Lavrentiev and Y. Maeda, Appl. Phys. Lett. 89, 113118 (2006).
S. Miwa, M. Shiraishi, S. Tanabe, M. Mizugurhi, T. Shinjo and Y. Suzuki, Phys. Rev. B 176, 214414 (2007).
A. Bernand-Mantel, P. Seneor, K. Bouzehouane, S. Fusil, C. Deranlot, F. Petroff and A. Fert, Nat. Phys. 5, 920 (2009).
M. Mizuguchi and K. Takanashi, J. Phys. D 44, 064007 (2011).
S. Yuasa, A. Fukushima, T. Nagahama, K. Ando and Y. Suzuki, Jpn. J. Appl. Phys. 43, L588 (2004).
S. Yuasa, T. Nagahama, A. Fukushima, Y. Suzuki and K. Ando, Nature Mater. 3, 868 (2004).
S. Ishibashi, T. Seki, T. Nozaki, H. Kubota, S. Yakata, A. Fukushima, S. Yuasa, H. Maehara, K. Tsunekawa, D. D. Djayaprawira and Y. Suzuki, Appl. Phys. Exp. 3, 073001 (2010).
M. H. Jung, S. Park, C. You and S. Yuasa, Phys. Rev. B 81, 134419 (2010).
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Miwa, S., Mizuochi, N., Shinjo, T. et al. Spin-torque magnetic resonance of Fe nanoparticles in Fe/MgO/Fe magnetic tunnel junctions. Journal of the Korean Physical Society 62, 2206–2209 (2013). https://doi.org/10.3938/jkps.62.2206
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DOI: https://doi.org/10.3938/jkps.62.2206