請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17623
完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 薛文証 | |
dc.contributor.author | Chang-Hung Chen | en |
dc.contributor.author | 陳長鴻 | zh_TW |
dc.date.accessioned | 2021-06-08T00:26:02Z | - |
dc.date.copyright | 2013-07-25 | |
dc.date.issued | 2013 | |
dc.date.submitted | 2013-07-15 | |
dc.identifier.citation | L. Esaki and R. Tsu. “Superlattice and negative differential conductivity in semiconductors,” IBM J. Res. Dev. 14, 61-65, (1970).
2 L. L. Chang, L. Esaki, W. E. Howard, R. Ludeke, and G. Schul. “Structures grown by molecular beam epitaxy,” J. Vac. Sci. Technol. 10, 655-662, (1973). 3 L. L. Chang, L. Esaki, W. E. Howard, and R. Ludeke. “The growth of a GaAs-GaAlAs superlattice,” J. Vac. Sci. Technol. 10, 11-16, (1973). 4 L. Esaki and L. L. Chang. “New transport phenomenon in a semiconductor 'superlattice',” Phys. Rev. Lett. 33, 495-498, (1974). 5 R. Dingle, A. C. Gossard, and W. Wiegmann. “Direct observation of superlattice formation in a semiconductor heterostructure,” Phys. Rev. Lett. 34, 1327-1330, (1975). 6 Y. Bomze, R. Hey, H. T. Grahn, and S. W. Teitsworth. “Noise-induced current switching in semiconductor superlattices: Observation of nonexponential kinetics in a high-dimensional system,” Phys. Rev. Lett. 109, 026801, (2012). 7 W. J. Hsueh, C. T. Chen, and C. H. Chen. “Omnidirectional band gap in fibonacci photonic crystals with metamaterials using a band-edge formalism,” Phys. Rev. A 78, 013836, (2008). 8 M. N. Baibich, J. M. Broto, A. Fert, F. N. Van Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich, and J. Chazelas. “Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices,” Phys. Rev. Lett. 61, 2472-2475, (1988). 9 H. Ohno, E. E. Mendez, J. A. Brum, J. M. Hong, F. Agulla-Rueda, L. L. Chang, and L. Esaki. “Observation of tamm states in superlattices,” Phys. Rev. Lett. 64, 2555-2558, (1990). 10 M. Stelicka, R. Kucharczyk, and M. L. Glasser. “Surface states in superlattices,” Phys. Rev. B 42, 1458-1461, (1990). 11 L. Esaki, L. L. Chang, and E. E. Mendez. “Polytype superlattices and multi-heterojunctions,” Jpn. J. Appl. Phys. 20, (1981). 12 P. Masri and M. D. Rahmani. “Electronic surface states in semiconductor superlattices: The case of a triple-constituent superlattice,” Phys. Rev. B 40, 1175-1185, (1989). 13 G. Bastard. “Theoretical investigations of superlattice band structure in the envelope-function approximation,” Phys. Rev. B 25, 7584-7597, (1982). 14 P. F. Yuh and K. L. Wang. “Novel infrared band-aligned superlattice laser,” Appl. Phys. Lett. 51, 1404-1406, (1987). 15 P. Vasilopoulos, F. M. Peeters, and D. Aitelhabti. “Quantum tunability of superlattice minibands,” Phys. Rev. B 41, 10021-10027, (1990). 16 J. A. C. Bland and B. Heinrich, Ultrathin magnetic structures I: An introduction to the electronic, magnetic and structural properties, Springer, New York (2005). 17 S. A. Wolf, D. D. Awschalom, R. A. Buhrman, J. M. Daughton, S. von Molnar, M. L. Roukes, A. Y. Chtchelkanova, and D. M. Treger. “Spintronics: A spin-based electronics vision for the future,” Science 294, 1488-1495, (2001). 18 D. D. Awschalom and M. E. Flatte. “Challenges for semiconductor spintronics,” Nat. Phys. 3, 153-159, (2007). 19 E. Yablonovitch. “Inhibited spontaneous emission in solid-state physics and electronics,” Phys. Rev. Lett. 58, 2059-2062, (1987). 20 K. Busch, G. von Freymann, S. Linden, S. F. Mingaleev, L. Tkeshelashvili, and M. Wegener. “Periodic nanostructures for photonics,” Phys. Rep. 444, 101-202, (2007). 21 Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies. “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457, 174-178, (2009). 22 W. J. Hsueh and S. J. Wun. “Simple expressions for the maximum omnidirectional bandgap of bilayer photonic crystals,” Opt. Lett. 36, 1581-1583, (2011). 23 J. N. Winn, Y. Fink, S. Fan, and J. D. Joannopoulos. “Omnidirectional reflection from a one-dimensional photonic crystal,” Opt. Lett. 23, 1573-1575, (1998). 24 W. J. Hsueh, S. J. Wun, and T. H. Yu. “Characterization of omnidirectional bandgaps in multiple frequency ranges of one-dimensional photonic crystals,” J. Opt. Soc. Am. B 27, 1092-1098, (2010). 25 J. I. Martı́n, J. Nogues, K. Liu, J. L. Vicent, and I. K. Schuller. “Ordered magnetic nanostructures: Fabrication and properties,” J. Magn. Magn. Mater. 256, 449-501, (2003). 26 S. Neusser and D. Grundler. “Magnonics: Spin waves on the nanoscale,” Adv. Mater. 21, 2927-2932, (2009). 27 A. Khitun, M. Bao, and K. L. Wang. “Magnonic logic circuits,” J. Phys. D: Appl. Phys. 43, 264005, (2010). 28 C. Chappert, A. Fert, and F. N. V. Dau. “The emergence of spin electronics in data storage,” Nat. Mater. 6, 813, (2007). 29 B. Lenk, H. Ulrichs, F. Garbs, and M. Munzenberg. “The building blocks of magnonics,” Phys. Rep. 507, 107-136, (2011). 30 H. Al-Wahsh, A. Akjouj, B. Djafari-Rouhani, and L. Dobrzynski. “Magnonic circuits and crystals,” Surf. Sci. Rep. 66, 29-75, (2011). 31 R. P. Tiwari and D. Stroud. “Magnetic superlattice with two-dimensional periodicity as a waveguide for spin waves,” Phys. Rev. B 81, 220403, (2010). 32 M. Krawczyk and H. Puszkarski. “Plane-wave theory of three-dimensional magnonic crystals,” Phys. Rev. B 77, 054437, (2008). 33 L. L. Hinchey and D. L. Mills. “Magnetic properties of superlattices formed from ferromagnetic and antiferromagnetic materials,” Phys. Rev. B 33, 3329-3343, (1986). 34 D. S. Deng, X. F. Jin, and R. Tao. “Magnon energy gap in a periodic anisotropic magnetic superlattice,” Phys. Rev. B 66, 104435, (2002). 35 N. I. Polushkin. “Formation of narrow spin-wave transmission bands in lateral magnetic superlattices,” Phys. Rev. B 82, 172405, (2010). 36 Z. K. Wang, V. L. Zhang, H. S. Lim, S. C. Ng, M. H. Kuok, S. Jain, and A. O. Adeyeye. “Nanostructured magnonic crystals with size-tunable bandgaps,” ACS Nano 4, 643-648, (2010). 37 M. P. Kostylev, A. A. Stashkevich, and N. A. Sergeeva. “Collective magnetostatic modes on a one-dimensional array of ferromagnetic stripes,” Phys. Rev. B 69, 064408, (2004). 38 Z. K. Wang, M. H. Kuok, S. C. Ng, D. J. Lockwood, M. G. Cottam, K. Nielsch, R. B. Wehrspohn, and U. Gosele. “Spin-wave quantization in ferromagnetic nickel nanowires,” Phys. Rev. Lett. 89, 027201, (2002). 39 C. Mathieu, J. Jorzick, A. Frank, S. O. Demokritov, A. N. Slavin, B. Hillebrands, B. Bartenlian, C. Chappert, D. Decanini, F. Rousseaux, and E. Cambril. “Lateral quantization of spin waves in micron size magnetic wires,” Phys. Rev. Lett. 81, 3968-3971, (1998). 40 V. V. Kruglyak, P. S. Keatley, A. Neudert, R. J. Hicken, J. R. Childress, and J. A. Katine. “Imaging collective magnonic modes in 2d arrays of magnetic nanoelements,” Phys. Rev. Lett. 104, 027201, (2010). 41 N. I. Polushkin. “Excitation of coupled oscillations in lateral ferromagnetic heterostructures,” Phys. Rev. B 77, 180401, (2008). 42 S. Neusser, G. Duerr, H. G. Bauer, S. Tacchi, M. Madami, G. Woltersdorf, G. Gubbiotti, C. H. Back, and D. Grundler. “Anisotropic propagation and damping of spin waves in a nanopatterned antidot lattice,” Phys. Rev. Lett. 105, 067208, (2010). 43 R. W. Peng, Y. M. Liu, X. Q. Huang, F. Qiu, M. Wang, A. Hu, S. S. Jiang, D. Feng, L. Z. Ouyang, and J. Zou. “Dimerlike positional correlation and resonant transmission of electromagnetic waves in aperiodic dielectric multilayers,” Phys. Rev. B 69, 165109, (2004). 44 S. V. Zhukovsky. “Perfect transmission and highly asymmetric light localization in photonic multilayers,” Phys. Rev. A 81, 053808, (2010). 45 D. Shechtman, I. Blech, D. Gratias, and J. W. Cahn. “Metallic phase with long-range orientational order and no translational symmetry,” Phys. Rev. Lett. 53, 1951-1953, (1984). 46 D. Levine and P. J. Steinhardt. “Quasicrystals: A new class of ordered structures,” Phys. Rev. Lett. 53, 2477-2480, (1984). 47 M. E. Zoorob, M. D. B. Charlton, G. J. Parker, J. J. Baumberg, and M. C. Netti. “Complete photonic bandgaps in 12-fold symmetric quasicrystals,” Nature 404, 740-743, (2000). 48 Z. Feng, X. Zhang, Y. Wang, Z.-Y. Li, B. Cheng, and D.-Z. Zhang. “Negative refraction and imaging using 12-fold-symmetry quasicrystals,” Phys. Rev. Lett. 94, 247402, (2005). 49 W. Man, M. Megens, P. J. Steinhardt, and P. M. Chaikin. “Experimental measurement of the photonic properties of icosahedral quasicrystals,” Nature 436, 993-996, (2005). 50 L. Levi, M. Rechtsman, B. Freedman, T. Schwartz, O. Manela, and M. Segev. “Disorder-enhanced transport in photonic quasicrystals,” Science 332, 1541-1544, (2011). 51 N. H. Liu. “Propagation of light waves in Thue-Morse dielectric multilayers,” Phys. Rev. B 55, 3543-3547, (1997). 52 H. Lei, J. Chen, G. Nouet, S. Feng, Q. Gong, and X. Jiang. “Photonic band gap structures in the Thue-Morse lattice,” Phys. Rev. B 75, 205109, (2007). 53 L. Moretti, I. Rea, L. Rotiroti, I. Rendina, G. Abbate, A. Marino, and L. De Stefano. “Photonic band gaps analysis of Thue-Morse multilayers made of porous silicon,” Opt. Express 14, 6264-6272, (2006). 54 C. S. Ryu, G. Y. Oh, and M. H. Lee. “Extended and critical wave functions in a Thue-Morse chain,” Phys. Rev. B 46, 5162-5168, (1992). 55 W. J. Hsueh, C. H. Chen, and C. H. Chang. “Bound states in the continuum in quasiperiodic systems,” Phys. Lett. A 374, 4804-4807, (2010). 56 J. W. Feng, G. J. Jin, A. Hu, S. S. Kang, S. S. Jiang, and D. Feng. “Magnetostatic modes in fibonacci magnetic and nonmagnetic multilayers,” Phys. Rev. B 52, 15312-15318, (1995). 57 S. S. Kang. “Magnetostatic excitations in quasiperiodic antiferromagnetic superlattices,” Phys. Rev. B 65, 064401, (2002). 58 C. G. Bezerra and M. G. Cottam. “Effects of the biquadratic exchange coupling on the localization and scaling laws of spin waves in fibonacci superlattices,” Phys. Rev. B 65, 054412, (2002). 59 T. Matsui, A. Agrawal, A. Nahata, and Z. V. Vardeny. “Transmission resonances through aperiodic arrays of subwavelength apertures,” Nature 446, 517-521, (2007). 60 E. L. Albuquerque and M. G. Cottam. “Theory of elementary excitations in quasiperiodic structures,” Phys. Rep. 376, 225-337, (2003). 61 M. Kohmoto, B. Sutherland, and K. Iguchi. “Localization of optics: Quasiperiodic media,” Phys. Rev. Lett. 58, 2436-2438, (1987). 62 L. Dal Negro, C. J. Oton, Z. Gaburro, L. Pavesi, P. Johnson, A. Lagendijk, R. Righini, M. Colocci, and D. S. Wiersma. “Light transport through the band-edge states of fibonacci quasicrystals,” Phys. Rev. Lett. 90, 055501, (2003). 63 P. W. Anderson. “Absence of diffusion in certain random lattices,” Phys. Rev. 109, 1492-1505, (1958). 64 S. John. “Electromagnetic absorption in a disordered medium near a photon mobility edge,” Phys. Rev. Lett. 53, 2169-2172, (1984). 65 D. S. Wiersma, P. Bartolini, A. Lagendijk, and R. Righini. “Localization of light in a disordered medium,” Nature 390, 671-673, (1997). 66 X. Q. Huang, S. S. Jiang, R. W. Peng, and A. Hu. “Perfect transmission and self-similar optical transmission spectra in symmetric fibonacci-class multilayers,” Phys. Rev. B 63, 245104, (2001). 67 R. Nava, J. Taguena-Martinez, J. A. d. Rio, and G. G. Naumis. “Perfect light transmission in fibonacci arrays of dielectric multilayers,” J. Phys.: Condens. Matter 21, 155901, (2009). 68 E. Macia. “Optical engineering with fibonacci dielectric multilayers,” Appl. Phys. Lett. 73, 3330-3332, (1998). 69 W. J. Hsueh, S. J. Wun, Z. J. Lin, and Y. H. Cheng. “Features of the perfect transmission in Thue-Morse dielectric multilayers,” J. Opt. Soc. Am. B 28, 2584-2591, (2011). 70 W. G. Wang, M. Li, S. Hageman, and C. L. Chien. “Electric-field-assisted switching in magnetic tunnel junctions,” Nat. Mater. 11, 64-68, (2012). 71 Z. M. Zeng, P. K. Amiri, G. Rowlands, H. Zhao, I. N. Krivorotov, J. P. Wang, J. A. Katine, J. Langer, K. Galatsis, K. L. Wang, and H. W. Jiang. “Effect of resistance-area product on spin-transfer switching in MgO-based magnetic tunnel junction memory cells,” Appl. Phys. Lett. 98, 072512-072513, (2011). 72 J. S. Moodera, L. R. Kinder, T. M. Wong, and R. Meservey. “Large magnetoresistance at room temperature in ferromagnetic thin film tunnel junctions,” Phys. Rev. Lett. 74, 3273-3276, (1995). 73 W. Dexin, C. Nordman, J. M. Daughton, Q. Zhenghong, and J. Fink. “70% tmr at room temperature for SDT sandwich junctions with CoFeB as free and reference layers,” IEEE Trans. Magn. 40, 2269-2271, (2004). 74 Z. M. Zeng, X. F. Han, W. S. Zhan, Y. Wang, Z. Zhang, and S. Zhang. “Oscillatory tunnel magnetoresistance in double barrier magnetic tunnel junctions,” Phys. Rev. B 72, 054419, (2005). 75 W. H. Butler, X. G. Zhang, T. C. Schulthess, and J. M. MacLaren. “Spin-dependent tunneling conductance of Fe|MgO|Fe sandwiches,” Phys. Rev. B 63, 054416, (2001). 76 J. Mathon and A. Umerski. “Theory of tunneling magnetoresistance of an epitaxial Fe/MgO/Fe(001) junction,” Phys. Rev. B 63, 220403, (2001). 77 S. Yuasa, T. Nagahama, A. Fukushima, Y. Suzuki, and K. Ando. “Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions,” Nat. Mater. 3, 868, (2004). 78 J. Hayakawa, S. Ikeda, Y. M. Lee, F. Matsukura, and H. Ohno. “Effect of high annealing temperature on giant tunnel magnetoresistance ratio of CoFeB/MgO/CoFeB magnetic tunnel junctions,” Appl. Phys. Lett. 89, 232510-232513, (2006). 79 S. Ikeda, J. Hayakawa, Y. Ashizawa, Y. M. Lee, K. Miura, H. Hasegawa, M. Tsunoda, F. Matsukura, and H. Ohno. “Tunnel magnetoresistance of 604% at 300 k by suppression of ta diffusion in CoFeB/MgO/CoFeB pseudo-spin-valves annealed at high temperature,” Appl. Phys. Lett. 93, 082508-082503, (2008). 80 L. X. Jiang, H. Naganuma, M. Oogane, and Y. ando. “Large tunnel magnetoresistance of 1056% at room temperature in MgO based double barrier magnetic tunnel,” Appl. Phys. Express 2, 083002, (2009). 81 M. Bowen, V. Cros, F. Petroff, A. Fert, C. M. Boubeta, J. L. Costa-Kramer, J. V. Anguita, A. Cebollada, F. Briones, J. M. de Teresa, L. Morellon, M. R. Ibarra, F. Guell, F. Peiro, and A. Cornet. “Large magnetoresistance in Fe/MgO/FeCo(001) epitaxial tunnel junctions on GaAs(001),” Appl. Phys. Lett. 79, 1655-1657, (2001). 82 J. Faure-Vincent, C. Tiusan, E. Jouguelet, F. Canet, M. Sajieddine, C. Bellouard, E. Popova, M. Hehn, F. Montaigne, and A. Schuhl. “High tunnel magnetoresistance in epitaxial Fe/MgO/Fe tunnel junctions,” Appl. Phys. Lett. 82, 4507-4509, (2003). 83 G. Bastard, Wave mechanics applied to semiconductor heterostructures, Les Editions de Physique, France (1988). 84 E. L. Ivčenko and G. E. Pikus, Superlattices and other heterostructures: Symmetry and optical phenomena, Springer-Verlag, New York (1995). 85 S. L. Chuang, Physics of optoelectronic devices, John Wiley & Sons, New York (1995). 86 W. J. Hsueh, C. H. Chen, and J. A. Lai. “Splitting rules of electronic miniband in fibonacci superlattices: A gap map approach,” Eur. Phys. J. B 73, 503, (2010). 87 W. J. Hsueh and H. C. Chen. “Calculation of electronic surface states in superlattices via graph formulations,” Phy. Rev. E 76, 057701, (2007). 88 C. Janot, Quasicrystals. A primer, 2nd edition, Clarendon Press, New York (1997). 89 W. J. Hsueh, S. J. Wun, and C. W. Tsao. “Branching features of photonic bandgaps in fibonacci dielectric heterostructures,” Optics Communications 284, 1880-1886, (2011). 90 B. D. Cullity and C. D. Graham, Introduction to magnetic materials, Wiley, New Jersey (2011). 91 A. Aharoni, Introduction to the theory of ferromagnetism, Clarendon Press, New York (2000). 92 M. G. Cottam, Linear and nonlinear spin waves in magnetic films and superlattices, World Scientific, Singapore (1994). 93 L. D. Landau, E. M. Lifshitz, and L. P. Pitaevskii, Electrodynamics of continuous media, Pergamon, Moscow (1984). 94 D. D. Stancil, Theory of magnetostatic waves, Springer London (2011). 95 R. E. Camley, T. S. Rahman, and D. L. Mills. “Magnetic excitations in layered media: Spin waves and the light-scattering spectrum,” Phys. Rev. B 27, 261-277, (1983). 96 K.-S. Lee, D.-S. Han, and S.-K. Kim. “Physical origin and generic control of magnonic band gaps of dipole-exchange spin waves in width-modulated nanostrip waveguides,” Phys. Rev. Lett. 102, 127202, (2009). 97 W. J. Hsueh, C. H. Chen, and R. Z. Qiu. “Perfect transmission of spin waves in a one-dimensional magnonic quasicrystal,” Phys. Lett. A 377, 1378-1385, (2013). 98 S. Piramanayagam and T. C. Chong, Developments in data storage: Materials perspective, Wiley-IEEE Press, (2011). 99 R. T. Merrill, M. W. McElhinny, and P. L. McFadden, The magnetic field of the earth : Paleomagnetism, the core, and the deep mantle, Academic Press, San Diego (1998). 100 P. D. A. G. Gurevich and G. A. Melkov, Magnetization oscillations and waves, CRC PressINC, Florida (1996). 101 V. S. Tkachenko, V. V. Kruglyak, and A. N. Kuchko. “Spectrum and reflection of spin waves in magnonic crystals with different interface profiles,” Phys. Rev. B 81, 024425, (2010). 102 V. V. Kruglyak, M. L. Sokolovskii, V. S. Tkachenko, and A. N. Kuchko. “Spin-wave spectrum of a magnonic crystal with an isolated defect,” J. Appl. Phys. 99, 08C906-903, (2006). 103 J. C. Slonczewski. “Conductance and exchange coupling of two ferromagnets separated by a tunneling barrier,” Phys. Rev. B 39, 6995-7002, (1989). 104 E. L. Wolf, Principles of electron tunneling spectroscopy: Second edition, OUP Oxford, New York (2012). 105 J. Faure-Vincent, C. Tiusan, C. Bellouard, E. Popova, M. Hehn, F. Montaigne, and A. Schuhl. “Interlayer magnetic coupling interactions of two ferromagnetic layers by spin polarized tunneling,” Phys. Rev. Lett. 89, 107206, (2002). 106 R. Matsumoto, A. Fukushima, K. Yakushiji, S. Yakata, T. Nagahama, H. Kubota, T. Katayama, Y. Suzuki, K. Ando, S. Yuasa, B. Georges, V. Cros, J. Grollier, and A. Fert. “Spin-torque-induced switching and precession in fully epitaxial Fe/MgO/Fe magnetic tunnel junctions,” Phys. Rev. B 80, 174405, (2009). 107 C. Tiusan, F. Greullet, M. Hehn, F. Montaigne, S. Andrieu, and A. Schuhl. “Spin tunnelling phenomena in single-crystal magnetic tunnel junction systems,” J. Phys.: Condens. Matter 19, 165201, (2007). 108 S. Yuasa, T. Nagahama, and Y. Suzuki. “Spin-polarized resonant tunneling in magnetic tunnel junctions,” Science 297, 234, (2002). | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17623 | - |
dc.description.abstract | 本論文研究電子在半導體超晶格、磁子晶體和磁性穿隧接面奈米結構中傳輸之特性。對於半導體超晶格,本文利用能帶圖方法,研究類周期超晶格在不同基底和階數下碎狀迷你能帶的分裂規則。類周期超晶格的能帶分裂可分為好幾個區域,每個區域存在著相同數量的允帶和禁帶。研究發現對於費布那西超晶格結構來說,每個區域的能帶分裂一定會有二個主要禁帶。此主要禁帶的中心和寬度在階數上升時會收斂至常數。除了主要的禁帶之外,大多數禁帶的寬度在系統階數上升時會下降。本文也發現類周期超晶格能帶分裂的不變條件。
關於磁子晶體,本文發現在類周期磁子晶體中的自旋波存在完全傳輸。完全傳輸的位置正好對應於在能帶圖中的重疊能帶邊際。重疊能帶邊際點只會在特定的頻率和層厚度出現。然而,在階數大於3時, 重疊能帶邊際線對於任意的層厚度都會存在。利用布洛赫相位的餘弦可以求出在任意厚度與階數下系統的重疊能帶邊際線之頻率。當階數增加時,在較低階系統中出現重疊能帶邊際線依然會在高階系統中出現。完全傳輸的銳度在高階系統時會增加,可用來發展高品質,多通道的濾波器或共振腔。 本文計算結果顯示,共振峰值和半高寬的大小與類周期磁子晶體的階數有關。當階數上升時,共振峰值數量會成倍的增加。半高寬則是會隨階數的增加而下降。雖然半高寬在高階系統時非常的小,共振點仍因為完全傳輸的特性而保持在1。研究發現共振點的位置和特徵函數cos (KL) 有關。本文提出的填充因子和半高寬之關係可以藉由改變材料厚度來最佳化超窄帶通濾波器的設計。 本文也提出了一個使用超晶格為位障的磁性穿隧接面來提升穿隧磁阻,其中超晶格由非磁性金屬與超薄的氧化鎂絕緣層所組成。相較於傳統用較厚氧化鎂絕緣層的磁性穿隧接面, 磁性穿隧接面的穿隧磁阻可以達到 。研究發現在反平行結構沒有自旋極化共振穿隧時,將會有非常高的穿隧磁阻。 | zh_TW |
dc.description.abstract | Electron transport in nanostructures, including semiconductor superlattices, magnonic crystals, and magnetic tunnel junctions, is studied in this thesis. For semiconductor superlattices, the splitting rules for the fragmental miniband in quasiperiodic superlattices with arbitrary basis and generation orders are presented using a gap map diagram. The band splitting for the quasiperiodic superlattice can be divided into many regions. Every region has a similar pattern, with the same number of allowed and gap bands. The width of most of the gap bands, with the exception of the major gaps, decreases when the generation order increases. The invariant conditions for band splitting in the quasiperiodic superlattice for arbitrary generation orders are determined.
The complete transport of spin waves in a quasiperiodic magnonic crystal is proposed. It is found that complete transport corresponds to the repeated bandedges in the bandedge map. These repeated bandedge points only occur at certain special frequencies and layer thicknesses. However, the repeated bandedge lines exist for arbitrary layer thicknesses, when the order of the quasiperiodic magnonic crystal is greater than 3. The frequency of the repeated bandedge lines for a system with an arbitrary layer thickness and an arbitrary order can be determined using the cosine of the Bloch phase. As the order increases, the repeated bandedge lines in systems with lower orders can also be maintained. The sharpness of the complete transport peaks increases for higher order systems, which is useful for the development of ultrahigh quality multichannel filters. The calculation results show that the number of resonant peaks and the magnitude of the full width half maximum are both dependent on the generation order of the quasiperiodic magnonic crystal. The number of resonant peaks increases exponentially as order of the system increases and the full width at half maximum decreases exponentially as order of the system increases. Even though the full width half maximum is quite small for a high order system, the resonance remains exactly at one, because of the properties of complete transport. It is found that the location of the resonant peaks is related to the eigenfunctions, cos (KL). The relationship between the filling factor and the full width at half maximum allows the optimization of the design of ultra-narrow band filters by changing the thickness of the materials. A magnetic tunnel junction with a superlattice barrier that is composed of nonmagnetic metals and ultrathin amorphous MgO insulators is also proposed to improve tunnel magnetoresistance. Compared to the traditional thick-MgO-based magnetic tunnel junctions, the tunnel magnetoresistance can reach over in magnetic tunnel junctions. The results indicate that an ultrahigh tunnel magnetoresistance is possible when there is no spin-polarized resonant tunneling in the anti-parallel configuration. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T00:26:02Z (GMT). No. of bitstreams: 1 ntu-102-F96525066-1.pdf: 1220705 bytes, checksum: 279413da43ace308010c9ac7c7ff39bf (MD5) Previous issue date: 2013 | en |
dc.description.tableofcontents | 摘要............................................. i
Abstract............................................. iii Contents.............................................. vi List of Figures.................................... viii List of Symbols.................................... xi List of Abbreviations............................... xv Chapter 1 Introduction............................ 1 1.1 Background and study goals ......................1 1.2 Literature review............................ 3 1.3 Chapter outlines................................ 6 Chapter 2 Electron Transport in Superlattices......8 2.1 Electronic states in heterostructures............8 2.2 Electron transport in periodic superlattices....15 2.3 Electron transport in quasiperiodic superlattices ........................................................17 2.4 The Effect of compound concentration on bandstructures ................................ 24 Chapter 3 Magnetism in Magnetic Materials.... 32 3.1 The origin of magnetism.................... 32 3.2 Magnetic moment, magnetization , and magnetic susceptibility .................................... 34 3.3 Classes of magnetic materials............ 35 3.4 The energy in magnetic materials........ 38 3.5 Different regions of magnetic behavior........ 41 Chapter 4 Spin Wave in Magnonic Crystals .... 46 4.1 The theory of magnonic crystals ........ 46 4.2 The effect of bonding materials ............ 53 4.3 Anisotropy effects on transport............ 57 4.4 Thicknesses dependence of transport........ 57 4.5 Spin wave filters ........................ 59 Chapter 5 Magnetoresistance in Magnetic Tunnel Junctions...............................................72 5.1 Theory of the tunnel magnetoresistance........ 72 5.2 Optimization of the tunnel magnetoresistance 74 5.3 Transport spectra in the magnetic tunnel junctions ........................................................76 Chapter 6 Conclusions .................... 88 6.1 Summary …................................ 88 6.2 Suggestion for future research............ 91 References ........................................ 92 | |
dc.language.iso | en | |
dc.title | 電子於磁性和非磁性超晶格之傳輸特性 | zh_TW |
dc.title | Characteristics of Electron Transport in Magnetic and Nonmagnetic Superlattices | en |
dc.type | Thesis | |
dc.date.schoolyear | 101-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 余宗興,洪姮娥,陳柏台,鄭勝文,郭鴻飛 | |
dc.subject.keyword | 超晶格,磁子晶體,穿隧磁阻,磁性穿隧接面,準晶體, | zh_TW |
dc.subject.keyword | superlattice,magnonic crystal,tunnel magnetoresistance,magnetic tunnel junction,quasicrystal, | en |
dc.relation.page | 106 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2013-07-15 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
顯示於系所單位: | 工程科學及海洋工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-102-1.pdf 目前未授權公開取用 | 1.19 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。