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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張慶瑞 | |
| dc.contributor.author | Jun-Yang Lai | en |
| dc.contributor.author | 賴俊陽 | zh_TW |
| dc.date.accessioned | 2021-06-13T03:20:58Z | - |
| dc.date.available | 2011-08-01 | |
| dc.date.copyright | 2006-08-01 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-28 | |
| dc.identifier.citation | Chapter 1
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[11] Mei-Feng Lai, Zung-Hang Wei, Ching-Ray Chang, J. C. Wu, J. H. Kuo, and Jun-Yang Lai, Phys. Rev. B 67, 104419 (2003). [12]S. S. P. Parkin, K. P. Roche, M. G. Samant, P. M. Rice, R. B. Beyers, R.E. Scheuerlein, E. J. O’Sullivan, S. L. Brown, J. Buccigano, D. W. Abraham,Y. Lu, M. Rooks, P. L. Trouilloud, R. A. Wanner, and W. J. Gallagher,J. Appl. Phys. 85, 5828 (1999). [13]A.Aharoni,”Introduction to the Theory of Ferromagnetism” (The International Series of Monographs on Physics ,New York 1996). [14]Brown,W.F.Jr,J.Appl.Phys. 30 ,62S-9S(1959) [15]Aharoni A,Rev.Mod.Phys.34,227(1962). [16]M.F.Lai doctor thesis (2005). Chapter 5 References [1] S. Y. Chou, P. R. Krauss, and L. Kong, J. Appl. Phys. 79, 6101 (1996). [2] K. J. Kirk, J. N. Chapman, S. McVitie, P. R. Atchison, and C. D. W. Wilkinson, J. Appl. Phys. 87, 5105 (2000). [3] R. P. Cowburn, D. K. Koltsov, A. O. Adeyeye, M. E. Welland, and D. M. Tricker, Phys. Rev. Lett. 83, 1042 (1999). [4] M. Schneider and H. Hoffmann, J. Appl. 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[3] J.-G. Zhu and H. Fang, IEEE Trans. Magn., vol. 34, no. 4, pp. 1609–1611, Jul. 1998. [4] L. Torres, L. Lopez-Diaz, and J. Iniguez, Appl. Phys. Lett., vol. 73, pp. 3766–3768, 1998. [5] N. A. Usov and S. E. Peschany, J. Magn. Magn. Mater., vol. 130, pp. 275–287, 1994. [6] I. A. Campbell and A. Fert, Ferromagnetic Materials, E. P. Wohlfarth, Ed. Amsterdam, The Netherlands: North-Holland, 1980, vol. 2. [7] E. D. Boerner, H. N. Bertram, and H. Suhl, J. Appl. Phys., vol. 87, no. 9, pp. 5389–5391, 2000. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31813 | - |
| dc.description.abstract | In this thesis, we investigate the metastable state and magnetization processes of Permalloy thin film by means of numerical micromagnetic simulation and experiment. Besides, we study the effect of interparticle dipole interaction on Permalloy thin film arrays.
A metastable state for the elongated permalloy elements is found to exist within a short field range before magnetization reversal. From the micromagnetic simulation it exhibits a wave-like structure, and the corresponding magnetic pole density distribution shows a pattern with periodic spots along the boundary. We also use magnetic force microscopy imaging and magnetoresistance measurement, which measures the nucleation field and coercive field, to study the non-coherent magnetization reversal properties of Permalloy ellipse. The metastable state before switching is found to be repeatable. The magnetic structures and hysteresis loops of permalloy thin film arrays are investigated here using magnetic force microscopy and vibrating sample magnetometer. The strength of interparticle dipole interaction can be revealed by the number of single-domain pairs with antiparallel magnetizations when the array is relaxed from a strong hard-axis field. Besides, hysteresis loops obtained by vibrating sample magnetometer measurements show that arrays with narrower interparticle spacings have lower coercivities and remanences. The results obtained from vibrating sample magnetometer are in very good agreement with magnetic force microscopy imaging. In the research on magnetic thin films with special geometries, we investigate the possible equilibrium states existing in the square network composed of four-arm junctions. Our result shows that different magnetization states in the junctions can be classified by counting the net magnetic pole densities accumulated over there. The pattern which has higher energy density, is for the first time observed experimentally in the square network. This provides a promising chance to use Permalloy network junctions as bit ultrahigh-density storage media. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T03:20:58Z (GMT). No. of bitstreams: 1 ntu-95-D90222008-1.pdf: 4119279 bytes, checksum: 01a944a5dca6e62f1bb95cf660d4c0ab (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | Abstract i
Contents iii List of Figures vi 1 Introduction 1 References 7 2 Review of theoretical fundamental to magnetic materials 9 2.1 Hamiltonian of the system 9 2.1.1 Exchange energy 10 2.1.2 Magnetostatic energy 11 2.1.3 Anisotropy energy 12 2.1.4 Zeeman energy 13 2.2 Brown's static equilibrium condition 13 2.3 Theoretical studies of the magnetization reversal of a single domain particle 15 2.3.1 Stoner-Wohlfarth model: coherent rotation 15 2.3.2 Nucleation problem 20 2.4 Micromagnetic simulation 24 References 28 3 Sample fabrication and experimental techniques 30 3.1 Electron beam lithography 31 3.2 Vibrating sample magnetometer 37 3.3 Magnetic force microscopy 39 3.4 Magnetoresistance measurement 45 References 47 4 Planar buckling metastable state before magnetization reversal in elongated permalloy thin films 49 4.1 Metastable state before magnetization reversal in single-domain elongated thin films 49 4.1.1 Introduction 49 4.1.2 Background 50 4.1.3 Micromagnetic simulation 51 4.1.4 Sample preparation and experiments 55 4.1.5 Results and discussion 57 4.2 Ab Initio studies of magnetization reversal via planar buckling mode 62 References 79 5 Magnetic properties of periodic permalloy elliptical arrays 81 5.1 Interparticle spacing dependence of magnetization reversal properties on permalloy thin film arrays 81 5.1.1 Introduction 81 5.1.2 Experimental method 81 5.1.3 Results and discussion 84 5.1.4 Summary 88 5.2 Angular dependence of magnetization reversal properties on permalloy thin film arrays 89 References 96 6 Micromagnetic states of four-armed square network junctions 97 6.1 Introduction 97 6.2 Simulation method 98 6.3 Experimental method 98 6.4 Results and discussion 99 References 103 7 Conclusion 104 | |
| dc.language.iso | en | |
| dc.subject | 軟磁薄膜 | zh_TW |
| dc.subject | 磁化過程 | zh_TW |
| dc.subject | 陣列系統 | zh_TW |
| dc.subject | magnetization reversal | en |
| dc.subject | micromagnetic simulation | en |
| dc.subject | electron beam lithography | en |
| dc.subject | permalloy | en |
| dc.subject | network junction | en |
| dc.subject | array | en |
| dc.title | 軟磁薄膜及其陣列系統磁化過程之研究 | zh_TW |
| dc.title | Magnetization Processes of Permalloy Thin Films and Its Array Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 吳仲卿,許仁華,楊志信,胡崇德 | |
| dc.subject.keyword | 軟磁薄膜,陣列系統,磁化過程, | zh_TW |
| dc.subject.keyword | permalloy,electron beam lithography,micromagnetic simulation,magnetization reversal,array,network junction, | en |
| dc.relation.page | 106 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-30 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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