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Magnetoresistance Effect in Tunnel Junctions with Perpendicularly Magnetized D022-Mn3-δGa Electrode and MgO Barrier

Takahide Kubota, Yoshio Miura1, Daisuke Watanabe, Shigemi Mizukami, Feng Wu, Hiroshi Naganuma2, Xianmin Zhang, Mikihiko Oogane2, Masafumi Shirai1, Yasuo Ando2, and Terunobu Miyazaki

WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
1Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
2Department of Applied Physics, Graduate school of Engineering, Tohoku University, Sendai 980-8579, Japan

(Received February 6, 2011; accepted February 28, 2011; published online March 14, 2011)

The tunnel magnetoresistance (TMR) effect with a perpendicularly magnetized D022-Mn3-δGa (δ= 0.6) electrode was investigated in epitaxially grown D022-Mn3-δGa (30)/Mg (dMg)/MgO (2)/CoFe (2.5) (nm) magnetic tunnel junctions (MTJs). The maximum TMR ratio of 9.8% (22.1%) was achieved at 300 K (10 K) with dMg = 0.4 nm. The bias voltage dependence of differential conductance spectra suggests the existence of a coherent tunneling process in the MTJs. First principles calculations of band dispersion relations and tunneling transmittance in a Mn3Ga/MgO/Mn3Ga structure were also performed. The results revealed the existence of Δ1-bands in Mn3Ga and demonstrated the possibility of a coherent tunneling process existing in the MTJ. ©2011 The Japan Society of Applied Physics

URL: http://apex.jsap.jp/link?APEX/4/043002/
DOI: 10.1143/APEX.4.043002


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References | Citing Articles (4)

  1. J. C. Slonczewski: J. Magn. Magn. Mater. 159 (1996) L1[CrossRef].
  2. S. Mangin, D. Ravelosona, J. A. Katine, M. J. Carey, B. D. Terris, and E. E. Fullerton: Nat. Mater. 5 (2006) 210[CrossRef].
  3. K. Yakushiji, S. Yuasa, T. Nagahama, A. Fukushima, H. Kubota, T. Katayama, and K. Ando: Appl. Phys. Express 1 (2008) 041302[JSAP].
  4. T. Kai, J. Ozeki, M. Nakayama, H. Akikawa, S. Ikegawa, and H. Yoda: presented at 53rd Magnetism and Magnetic Materials Conf., 2008, DC-07.
  5. K. Yakushiji, T. Saruya, H. Kubota, A. Fukushima, T. Nagahama, S. Yuasa, and K. Ando: Appl. Phys. Lett. 97 (2010) 232508[AIP Scitation].
  6. K. Mizunuma, M. Yamanouchi, S. Ikeda, H. Sato, H. Yamamoto, H.-D. Gan, K. Miura, J. Hayakawa, F. Matsukura, and H. Ohno: Appl. Phys. Express 4 (2011) 023002[JSAP].
  7. G. Kim, Y. Sakuraba, M. Oogane, Y. Ando, and T. Miyazaki: Appl. Phys. Lett. 92 (2008) 172502[AIP Scitation].
  8. M. Yoshikawa, E. Kitagawa, T. Nagase, T. Daibou, M. Nagamine, K. Nishiyama, T. Kishi, and H. Yoda: IEEE Trans. Magn. 44 (2008) 2573.
  9. T. Daibou, M. Yoshikawa, E. Kitagawa, T. Nagase, K. Nishiyama, M. Nagamine, M. Amano, M. Nakayama, T. Kai, T. Kishi, and H. Yoda: presented at 11th Joint MMM–Intermag Conf., 2010, DA-08.
  10. F. Wu, S. Mizukami, D. Watanabe, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki: Appl. Phys. Lett. 94 (2009) 122503[AIP Scitation].
  11. B. Balke, G. H. Fecher, J. Winterlik, and C. Felser: Appl. Phys. Lett. 90 (2007) 152504[AIP Scitation].
  12. F. Wu, S. Mizukami, D. Watanabe, E. P. Sajitha, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki: IEEE Trans. Magn. 46 (2010) 1863.
  13. J. C. Slonczewski: Phys. Rev. B 39 (1989) 6995[APS].
  14. R. Matsumoto, Y. Hamada, M. Mizuguchi, M. Shiraishi, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe, Y. Kurosaki, T. Nagahama, A. Fukushima, H. Kubota, S. Yuasa, and Y. Suzuki: Solid State Commun. 136 (2005) 611[CrossRef].
  15. G.-X. Miao, K. B. Chetry, A. Gupta, W. H. Butler, K. Tsunekawa, D. Djayaprawira, and G. Xiao: J. Appl. Phys. 99 (2006) 08T305[AIP Scitation].
  16. S. Baroni, A. Dal Corso, S. de Gironcoli, and P. Giannozzi: http://www.pwscf.org
  17. Y. Miura, H. Uchida, Y. Oba, K. Abe, and M. Shirai: Phys. Rev. B 78 (2008) 064416[APS].
  18. J. Winterlik, B. Balke, G. H. Fecher, C. Felser, M. C. M. Alves, F. Bernardi, and J. Morais: Phys. Rev. B 77 (2008) 054406[APS].

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