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研究生:王祥任
研究生(外文):Hsian-jen Wang
論文名稱:奈米尺度圓盤的磁區演化
論文名稱(外文):Magnetic domain evolution in nanoscale disk
指導教授:郭建成郭建成引用關係
指導教授(外文):Chien-Cheng Kuo
學位類別:碩士
校院名稱:國立中山大學
系所名稱:物理學系研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:70
中文關鍵詞:磁區磁易向性
外文關鍵詞:AnisotropyDomainCobalt
相關次數:
  • 被引用被引用:3
  • 點閱點閱:243
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
磁性為物質的基本屬性之一,對於不同材料的磁性研究,多年來廣泛的被研究以及應用。隨著近年來製程越作越小,奈米尺度下的一些基本物理現象越來越受重視。在微觀上,鐵磁性物質為了有效降低整體的系統總能量,樣品內部會切分成若干個磁區(magnetic domain) ,然而,從G. Leaf 等人的文章[34]我們看到在條狀的鈷樣品(Co bar) 中,在經歷外加場後的磁區組態其形成機制並非由總能量主導,而是與高外加場中的自旋波駐波頻率有關聯。為了進一步探討這個有趣的現象,我們利用電腦模擬的方式,對不同大小厚度具有垂直磁易向性的鈷圓盤(Co disk) 作一系列的模擬計算。從本研究中,我們將提出磁區翻轉的過程以及機制,同時也對能量與磁區間的關係作說明。
Magnetism is one of material essential attributes, the different material’s magnetic has been studied for many years as well as the application.The processing is smaller with recent years, and the submicro physical phenomenon adapt to more and more important. Microscopically, ferromagnetic material tend to reduce the total energy of the system, and the sample interior will response to devide several magnetic domains, however, from the article by G. Leaf et al[34], we saw the final domain structure at remanence of cobalt bar, which is not the configuration with lowest energy, is predicted from a high-field analysis of the frequencies of the standing spin waves. To further discuss this interesting phenomenon, we use the computer simulation method, and make a series of computation of cobalt disc with the various sizes and thickness. From this research, we will propose that the magnetic domain reverse process and mechanism, and also give showing relations to between the energy and the magnetic
domain.
1 前言1
2 磁學理論7
2.1 鐵磁性與交換能. . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 磁區. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Landau-Lifshitz equation . . . . . . . . . . . . . . . . . . . . 9
2.4 自旋波. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 模擬方法15
3.1 模擬原理. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 結果與討論19
4.1 實驗參數. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 磁滯曲線與磁化過程中磁區的改變. . . . . . . . . . . . . 21
4.3 週期. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4 能量. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.5 對稱. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5 總結 45
6 附錄 47
7 參考文獻 51
[1] PhysRevLett.86.1102 (2001) S. P. Li, D. Peyrade, M. Natali, A. Lebib,
and Y. Chen , U. Ebels, L. D. Buda, and K. Ounadjela
[2] PhysRevB.67.140405 (2003) C. A. F. Vaz, L. Lopez-Diaz, M. Kl‥aui, and
J. A. C. Bland, T. L. Monchesky and J. Unguris, Z. Cui
[3] PhysRevLett.88.157203 (2002) M. Natali, I. L. Prejbeanu, A. Lebib, L.
D. Buda, K. Ounadjela, and Y. Chen
[4] Science, 289 5481 (2000), 930-932. T. Shinjo, T. Okuno, R. Hassdorf, K.
Shigeto, T. Ono
[5] APPLIED PHYSICS LETTERS 86, 072507 (2005), P. Vavassori, M. Grimsditch,
V. Metlushko
[6] PhysRevLett.95.197204 (2005), Oleg Tchernyshyov and Gia-Wei Chern
[7] Nature, 422. 17. 701 (2003) O. PORTMANN, A. VATERLAUS and D.
PESCIA
[8] PhysRevLett.93.117205 (2004) Y. Z. Wu, C. Won, A. Scholl, A. Doran,
H. W. Zhao, X. F. Jin, and Z. Q. Qiu
[9] PhysRevB.70.224434 (2004) Joseph E. Davies, Olav Hellwig, Eric E. Fullerton, Greg Denbeaux, J. B. Kortright, and Kai Liu
[10] PhysRevB.54.3428 (1996) M. Hehn, S. Padovani, K. Ounadjela, and J.
P. Bucher
[11] PhysRevB 62, 6538 (2000) A. Asenjo, D. Garc′ıa, J. M. Garc′ıa, C. Prados,
and M. V′azquez
[12] PhysRevB.59.11914 (1999) U. R‥ udiger and J. Yu, L. Thomas and S. S.
P. Parkin, A. D. Kent
[13] PhysRevLett.88.157201 (2002) R. Danneau, P. Warin, J. P. Attan′e, I.
Petej, C. Beign′e, C. Fermon, O. Klein, A. Marty, F. Ott, Y. Samson, and M.
Viret
[14] Science, 284 5423 p2166(1999) H. A. Durr, E. Dudzik, S. S. Dhesi, J.
B. Goedkoop, G. van der Laan, M. Belakhovsky, C. Mocuta, A. Marty, Y.
Samson
[15] PhysRevLett.85.3962 (2000) M. Viret, Y. Samson, P. Warin, A. Marty,
F. Ott, E. Sønderg°ard, O. Klein, and C. Fermon
[16] Journal of Magnetism and Magnetic Materials, 303, e294-e298 (2006).
P. Warnicke, S. Felton, K. Gunnarsson, and P. Svedlindh
[17] PhysRevLett.95.026601 (2005) M. Kl‥aui, P.-O. Jubert, R. Allenspach,
A. Bischof, J. A. C. Bland, G. Faini, U. R‥ udiger, C. A. F. Vaz, L. Vila, and
C. Vouille
[18] PhysRevB.67.224404 (2003) Junya Shibata, Kunji Shigeto, and Yoshichika
Otani
[19] PhysRevB.66.132405 (2002) S. Jung, J. B. Ketterson, and V. Chandrasekhar
[20] PhysRevB.70.172404 (2004) L. Giovannini, F. Montoncello, F. Nizzoli,
G. Gubbiotti, G. Carlotti, T. Okuno, T. Shinjo, and M. Grimsditch
[21] PhysRevB.72.184419 (2005) G. Gubbiotti, G. Carlotti, T. Okuno, M.
Grimsditch, L. Giovannini, F. Montoncello, and F. Nizzoli
[22] PhysRevB.73.014425 (2006) M. Yan, G. Leaf, H. Kaper, R. Camley and
M. Grimsditch
[23] PhysRevB.73.052406 (2006) M. Bolte and G. Meier, C. Bayer
[24 ] PhysRevB.73.144430 (2006) G. Gubbiotti, M. Madami and S. Tacchi,
G. Carlotti, T. Okuno
[25] PhysRevLett.90.097202 (2003) M. Kl‥aui, C. A. F. Vaz, J. Rothman, J. A.
C. Bland, W. Wernsdorfer, G. Faini, and E. Cambril
[26] PhysRevB.73.134415 (2006) A. Maziewski, V. Zablotskii, and M. Kisielewski
[27] PhysRevB.65.024414 (2001) K. Yu. Guslienko, V. Novosad, Y. Otani,
H. Shima, and K. Fukamichi
[28] PhysRevB.71.060405 (2005) S. Komineas, C. A. F. Vaz, and J. A. C.
Bland, N. Papanicolaou
[29] PhysRevLett.98.087205 (2007) Sangkook Choi, Ki-Suk Lee, Konstantin
Yu. Guslienko, and Sang-Koog Kim
[30] PhysRevLett.93.257202 (2004) Riccardo Hertel, Wulf Wulfhekel, and
J ‥ urgen Kirschner
[31] PhysRevLett.89.277201 (2002) J. P. Park, P. Eames, D. M. Engebretson,
J. Berezovsky, and P. A. Crowell
[32] PhysRevLett.96.167207 (2006) J. Podbielski, F. Giesen, and D. Grundler
[33] PhysRevLett. 98, 157203 (2007) Vladislav E. Demidov, Ulf-Hendrik
Hansen, and Sergej O. Demokritov
[34] PhysRevLett.96.017201 (2006) G. Leaf, H. Kaper, M. Yan, V. Novosad,
P. Vavassori, R. E. Camley, and M. Grimsditch
[35] Science, 272 5269 (1996) M. Hehn, K. Ounadjela, J. P. Bucher, F. Rousseaux, D. Decanini, B. Bartenlian, and C. Chappert
[36] Introduction to solid state physics, C. Kittel
[37] BRIT. J. APPL. PHYS. (I. PHYS. D), 1969, SER. 2, VOL. 2. P. J.
GRUNDY and B. JOHNSON
[38] Magnetic domains : the analysis of magnetic microstructures / Alex
Hubert, Rudolf Sch‥afer, Berlin ; New York : Springer, c1998
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