Browse > Article
http://dx.doi.org/10.4283/JKMS.2011.21.2.052

Perpendicular Spin-transfer Torque in Asymmetric Magnetic Tunnel Junctions: Material Parameter Dependence  

Han, Jae-Ho (Department of Physics and PCTP, Pohang University of Science and Technology)
Lee, Hyun-Woo (Department of Physics and PCTP, Pohang University of Science and Technology)
Publication Information
Journal of the Korean Magnetics Society / v.21, no.2, 2011 , pp. 52-55 More about this Journal
Abstract
Spin-transfer torque is a useful tool to control the magnetic state in nanostructures. In magnetic tunnel junctions, the spin-transfer torque has two components, the in-plane spin torque and the perpendicular spin torque. While properties of the in-plane spin-transfer torque are relatively well understood, properties of the perpendicular spin-transfer torque still remain controversial. A recent experiment demonstrated that in asymmetric magnetic tunnel junctions, the bias voltage dependence of the perpendicular spin-transfer torque contains both linear and quadratic terms in the bias. However it still remains unexplored how the bias voltage dependence changes as a function of material parameters. In this paper, we systematically investigate the perpendicular spin-transfer torque in asymmetric magnetic tunnel junction by varying spin splitting energy, work function difference, and Fermi energy of the ferromagnetic metal leads.
Keywords
spin-transfer torque; magnetic tunnel junction; asymmetry; bias dependence;
Citations & Related Records
연도 인용수 순위
  • Reference
1 M. Wilczynski, J. Barnas, and R. Swirkowicz, Phys. Rev. B 77, 054434 (2008).   DOI   ScienceOn
2 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).   DOI   ScienceOn
3 Jack C. Sankey, Yong-Tao Cui, Jonathan Z. Sun, John C. Slonczewski, Robert A. Buhrman, and Daniel C. Ralph, Nature Phys. 4, 67 (2008).   DOI
4 Hitoshi Kubota, Akio Fukushima, Kay Yakushiji, Taro Nagahama, Shinji Yuasa, Koji Ando, Hiroki Maehara, Yoshinori Nagamine, Koji Tsunekawa, David D. Djayaprawira et al., Nature Phys. 4, 37 (2008).   DOI
5 Z. Li, S. Zhang, Z. Diao, Y. Ding, X. Tang, D. M. Apalkov, Z. Yang, K. Kawabata, and Y. Huai, Phys. Rev. Lett. 100, 246602 (2008).   DOI   ScienceOn
6 T. Devolder, Joo-Von Kim, C. Chappert, J. Hayakawa, K. Ito, H. Takahashi, S. Ikeda, and H. Ohno, J. Appl. Phys. 105, 113924 (2009).   DOI   ScienceOn
7 S. Petit, N. de Mestier, C. Baraduc, C. Thirion, Y. Liu, M. Li, P. Wang, and B. Dieny, Phys. Rev. B 78, 184420 (2008).   DOI   ScienceOn
8 Alina M. Deac, Akio Fukushima, Hitoshi Kubota, Hiroki Maehara, Yoshishige Suzuki, Shinji Yuasa, Yoshinori Nagamine, Koji Tsunekawa, David D. Djayaprawira, and Naoki Watanabe, Nature Phys. 4, 803 (2008).   DOI
9 S.-C. Oh, S.-Y. Park, A. Manchon, M. Chshiev, J.-H. Han, H.-W. Lee, J.-E. Lee, K.-T. Nam, Y. Jo, Y.-C. Kong et al., Nature Phys. 5, 898 (2009).   DOI
10 C. Wang, Y.-T. Cui, J. Z. Sun, J. A. Katine, R. A. Buhrman, and D. C. Ralph, Phys. Rev. B 79, 224416 (2009).   DOI   ScienceOn
11 M. H. Jung, S. Park, C.-Y. You, and S. Yuasa, Phys. Rev. B 81, 134419 (2010).   DOI   ScienceOn
12 O. G. Heinonen, S. W. Stokes, and J. Y. Yiet, Phys. Rev. Lett. 105, 066602 (2010).   DOI   ScienceOn
13 L. Berger, Phys. Rev. B 54, 9359 (1996).   DOI   ScienceOn
14 Gary A. Prinz, Science 282, 5394 (1998).
15 J. A. Katine and E. E. Fullerton, J. Magn. Magn. Mater. 320, 1217 (2008).   DOI   ScienceOn
16 J. C. Slonczewski, J. Magn. Magn. Mater. 159, L1 (1996).   DOI   ScienceOn
17 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).   DOI   ScienceOn