Hiroshima University Syllabus

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Academic Year School/Graduate School Lecture Code 2024Year Graduate School of Advanced Science and Engineering (Master's Course) Division of Advanced Science and Engineering Chemistry Program WSD16000 Specialized Education Chiral Topological Solitons Chiral Topological Solitons ANDREY LEONOV アンドレイ　レオノフ Higashi-Hiroshima 1st-Year,  Second Semester,  3Term (3T) Mon1-2 Lecture 1.0 E : English 3 : Undergraduate High-Intermediate 25 : Science and Technology 06 : Physics soliton, skyrmion, bimeron, hopfion, chiral magnets, Dzyaloshinskii-Moriya interaction, domain wall, spiral To deduce soliton stability in different condensed-matter systems such as chiral magnets and chiral liquid crystals; to investigate the internal properties of different soliton varieties such as skyrmions, hopfions etc. To get acquainted with the numerical methods of mumax3, matlab, Mathematica. lesson1 Solitons. Historical overview. KdV equation. Solitons in nature at different scales.lesson2 Basics of Micromagnetics. Overview of energy terms to stabilize multidimensional solitons. Continuous and discrete energy functionals. lesson3 Homogeneous states in an applied magnetic field for cubic and uniaxial magnetslesson4 Domain walls. Phase portraits. Pendulum. Neel and Bloch domain walls.lesson5 one-dimensional spiral states: helicoids and cones. Field and anisotropy-driven transformation.lesson6 two-dimensional isolated skyrmions. First-order phase transition with spirals. Condensation of skyrmions into a crystal.lesson7 Hopfion. The problem of hopfion stability in bulk cubic helimagnets. lesson8 Solitons in chiral liquid crystals. Defects. Torons. The notion of additional surface twists.lesson9lesson10lesson11lesson12lesson13lesson14lesson15 1) Physics of Ferromagnetism, Soshin Chikazumi2) A. Hubert, R. Shaefer, Magnetic Domains, The Analysis of Magnetic Microstructures3) lecture notes use provided lecture notes attendance, work in class Please fill in the class improvement questionnaire which is carried out on all classes.Instructors will reflect on your feedback and utilize the information for improving their teaching.
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