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MgO-based magnetic tunnel junction is a hot issue in the field of spin electronic devices, and its temperature and bias voltage play quite an important role in practical applications. Therefore, it is desiderated to obtain the temperature-bias phase diagram of MgO-based magnetic tunnel junction. This paper develops a theory which is suitable for magnetic tunnel junctions with single crystal barrier. In this theory, the single crystal barrier is regarded as a periodic grating, and the tunneling process is treated by optical diffraction theory, so the coherence of the tunneling electron can be well taken into account. Most importantly, the theory can handle both the temperature effect and bias effect of MgO-based magnetic tunnel junctions. According to the present theory, the temperature-bias phase diagram of MgO-based magnetic tunnel junctions is calculated under different half the exchange splittings, chemical potentials and periodic potentials. The theoretical results show that the extreme phase point of tunneling magnetoresistance (TMR) can move to high temperature region through regulating half the exchange splitting Δ of ferromagnetic electrode of MgO-based magnetic tunnel junction. This will be beneficial to the applications of magnetic tunnel junctions at room temperature. Moreover, the chemical potential μ can change the bias corresponding to the maximum phase point of TMR. As is well known, the chemical potential will vary with the material of ferromagnetic electrode. Therefore, if the material of ferromagnetic electrode is chosen with a proper chemical potential, we can obtain a large TMR under high bias voltage. In other words, the output voltage can be considerably increased. This will be favorable for the preparation of high power devices. In addition, it is found that the phase diagram of TMR is significantly dependent on periodic potential v( K h). As a result, the effects of temperature and bias voltage in the MgO-based magnetic tunnel junctions can be optimized by regulating half the exchange splitting Δ, chemical potential μ, and periodic potential v( K h). The present work provides a solid theoretical foundation for the applications of MgO-based magnetic tunnel junctions.
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Keywords:
- magnetic tunnel junctions /
- tunneling magnetoresistance /
- effect of temperature /
- effect of bias voltage
[1] 韩秀峰 2008 物理 37 392
Google Scholar
Han X F 2008 Physics 37 392
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[9] Yuasa S, Fukushima A, Kubota H, Suzuki Y, Ando K 2006 Appl. Phys. Lett. 89 042505
Google Scholar
[10] Hayakawa J, Ikeda S, Lee Y M, Matsukura F 2006 Appl. Phys. Lett. 89 232510
Google Scholar
[11] Hu B, Moges K, Honda Y, Liu H X, Uemura T, Yamamoto M, Inoue J, Shirai M 2016 Phys. Rev. B 94 094428
Google Scholar
[12] Slonczewski J C 1989 Phys. Rev. B 39 6995
Google Scholar
[13] Nozaki T, Hirohata A, Tezuka N, Sugimoto S, Inomata K 2005 Appl. Phys. Lett. 86 082501
Google Scholar
[14] Tanaka M A, Hori T, Mibu K, Kondou K, Ono T, Kasai S, Asaka T, Ionue J 2011 J. Appl. Phys. 110 073905
Google Scholar
[15] Wang S G, Ward R C C, Du G X, Han X F, Wang C, Kohn A 2008 Phys. Rev. B 78 180411
Google Scholar
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Google Scholar
[17] Fang H, Xiao M, Rui W, Du J 2018 J. Magn. Magn. Mater. 465 333
Google Scholar
[18] Fang H, Xiao M, Rui W, Du J, Tao Z 2016 Sci. Rep. 6 24300
Google Scholar
[19] Matsumoto R, Fukushima A, Nagahama T, Suzuki Y, Ando K, Yuasa S 2007 Appl. Phys. Lett. 90 252506
Google Scholar
[20] Kou X, Schmalhorst J, Thomas A, Reiss G 2006 Appl. Phys. Lett. 88 212115
Google Scholar
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图 1 MgO基磁性隧道结示意图
Figure 1. Diagram of MgO-based magnetic tunnel junction.
图 2 不同铁磁电极半交换劈裂能Δ下的温度-偏压相图 (a) Δ = 8 eV; (b) Δ = 9 eV; (c) Δ = 10 eV
Figure 2. Phase diagram of temperature and bias with variation of half the exchange splitting of the ferromagnetic electrodes Δ: (a) Δ = 8 eV; (b) Δ = 9 eV; (c) Δ = 10 eV.
图 3 不同的化学势μ下的温度-偏压相图 (a) μ = 10 eV; (b) μ = 11 eV; (c) μ = 12 eV
Figure 3. Phase diagram of temperature and bias with variation of chemical potential μ: (a) μ = 10 eV; (b) μ = 11 eV; (c) μ = 12 eV.
图 4 不同v(Kh)下的温度-偏压相图 (a) v(Kh) = 12.3 eV; (b) v(Kh) = 15.3 eV; (c) v(Kh) = 18.3 eV
Figure 4. Phase diagram of temperature and bias with variation of v (Kh): (a) v(Kh) = 12.3 eV; (b) v(Kh) = 15.3 eV; (c) v(Kh) = 18.3 eV.
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[1] 韩秀峰 2008 物理 37 392
Google Scholar
Han X F 2008 Physics 37 392
Google Scholar
[2] Yuasa S, Nagahama T, Fukushima A, Suzuki Y, Ando K 2004 Nat. Mater. 3 868
Google Scholar
[3] Ikeda S, Hayakawa J, Ashizawa Y, Lee Y M, Miura K, Hasegawa H, Tsunoda M, Matsukura F, Ohno H 2008 Appl. Phys. Lett. 93 082508
[4] Parkin S S P, Kaiser C, Panchula A, Rice P M, Hughes B S, Mahesh Y S H 2004 Nat. Mater. 3 862
Google Scholar
[5] Ma Q L, Wang S G, Zhang J, Wang Y, Ward R C C, Wang C, Kohn A, Zhang X G, Han X F 2009 Appl. Phys. Lett. 95 052506
Google Scholar
[6] Faure-Vincent J, Tiusan C, Jouguelet E, Canet F, Sajieddine M, Bellouard C, Hehn M, Montaigne F, Schuhl A 2003 Appl. Phys. Lett. 82 4507
Google Scholar
[7] Miao G X, Chetry K B, Gupta A, Bulter W H, Tsunekawa K, Djayaprawira D Xiao G 2006 J. Appl. Phys. 99 08T305
Google Scholar
[8] Ishikawa T, Marukame T, Kijima H, Matsuda K I, Uemura T, Arita M, Ymamoto M 2006 Appl. Phys. Lett. 89 192505
Google Scholar
[9] Yuasa S, Fukushima A, Kubota H, Suzuki Y, Ando K 2006 Appl. Phys. Lett. 89 042505
Google Scholar
[10] Hayakawa J, Ikeda S, Lee Y M, Matsukura F 2006 Appl. Phys. Lett. 89 232510
Google Scholar
[11] Hu B, Moges K, Honda Y, Liu H X, Uemura T, Yamamoto M, Inoue J, Shirai M 2016 Phys. Rev. B 94 094428
Google Scholar
[12] Slonczewski J C 1989 Phys. Rev. B 39 6995
Google Scholar
[13] Nozaki T, Hirohata A, Tezuka N, Sugimoto S, Inomata K 2005 Appl. Phys. Lett. 86 082501
Google Scholar
[14] Tanaka M A, Hori T, Mibu K, Kondou K, Ono T, Kasai S, Asaka T, Ionue J 2011 J. Appl. Phys. 110 073905
Google Scholar
[15] Wang S G, Ward R C C, Du G X, Han X F, Wang C, Kohn A 2008 Phys. Rev. B 78 180411
Google Scholar
[16] Fang H, Zang X, Xiao M, Zhong Y, Tao Z 2020 J. Appl. Phys. 127 163902
Google Scholar
[17] Fang H, Xiao M, Rui W, Du J 2018 J. Magn. Magn. Mater. 465 333
Google Scholar
[18] Fang H, Xiao M, Rui W, Du J, Tao Z 2016 Sci. Rep. 6 24300
Google Scholar
[19] Matsumoto R, Fukushima A, Nagahama T, Suzuki Y, Ando K, Yuasa S 2007 Appl. Phys. Lett. 90 252506
Google Scholar
[20] Kou X, Schmalhorst J, Thomas A, Reiss G 2006 Appl. Phys. Lett. 88 212115
Google Scholar
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