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AN IMPROVEMENT IN THE THEORY OF MICROMAGNETISM FOR FERROMAGNETS

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Science in China,Ser.A 1988年第11期 1354-1363页

作者：李伯臧蒲富恪 Institute of physics Academia Sinica Beijing Center of Theoretical physics CCAST (World Lab.) and intitute of physics

On the basis of the effective-field method, an improvement is made in micromagnetics which was established by Brown for the isothermal process of single-crystalline homogeneous ferromagnet. The improved theory enables us to consider the effect of magnetic and structural inhomogeneity in ferromagnet and to study the process with changing temperature. The boundary conditions for equations of motion and equilibrium distribution of magnetization vector field are derived and discussed.

关键词： micromagnetism effective-field inhomogeneity.

AN ANISOTROPIC MICROWAVE ABSORPTION IN YBa_2Cu_3O_(7-δ) THIN FILM

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Chinese Science Bulletin 1991年第10期36卷 819-822页

作者：侯碧辉金通政眭云霞周贵恩戚震中 Department of physics University of Science and Technology of China Hefei 230026 PRC Laboratory of Solid State Microstructures Nanjing University Nanjing 210008 PRC Center of Structure Analysis University of Science and Technology of China Hefei 230026 PRC intitute of Solid State physics Academia Sinica Hefei 230031 PRC

A very strong nonresonant low-field signal can be detected near and below zero resistance phase transition temperature T_c by either electron spin resonance (ESR) or nuclear magnetic resonance (NMR)in almost all systems of high T_c superconductive oxides. The essence of this phenomenon is that there is some loss absorption of electromagnetic radiant in the sample when it is in the normal state; and the absorption decreases obviously when it is in the superconducting state, but the absorption increases when the sample is in magnetic field, especially when the applied field H is greater than the superconducting

关键词： high T_c thin film YBa2Cu3O(7-δ) single crystal anisotropic microwāve absorption.

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Study on Computational Properties of Several VerticalGrids with a Nonhydrostatic Model in Comparisonto Analytical Solutions

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Advances in Atmospheric Sciences 2002年第3期19卷 528-543页

作者：刘宇迪季仲贞王斌 LASG Institute of Atmospheric physics Chinese Academy of Scienees Beijing 100029Meteorological College PLA University of Scienee and Engineering Nanjing 211101 LASG Intitute of Atmospheric Phisics Chinese Academy of Sciene.s Beijing 100029

Starting from nonhydrostatic anelastic equations a comparative investigation is performed of inertial-gravitational wave hundreds, tens and a few of kilometers in horizontal wavelength, which are ex amined on vertical grids available at present from the perspectives of frequency, vertical component of group velocity and the inappropriate range for a positive vertical component emerging, with the findings compared to analytical solutions. Evidence suggests that grids C’P and LZ are suitable for the study of the wave at the mentioned horizontal scales and the counterparts L and LY (LTS and CPTS) are applicable on ly to the horizontal scales of more (less) than lens of kilometers.

关键词： Vertical grids Frequency Vertical component of group velocity Range of vertical scales for positive and negative vertical component

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A Current Review on the Synthesis and Magnetic Properties of M-Type Hexaferrites Material

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World Journal of Condensed Matter physics 2018年第2期8卷 36-61页

作者： Virender Pratap Singh Rohit Jasrotia Rajesh Kumar Pankaj Raizada Sourbh Thakur Khalid M. Batoo M. Singh School of physics & Materials Science Shoolini University Bajhol Solan India Himalayan Centre of Excellence in Nanotechnology Shoolini University Bajhol Solan India Schoool of Chemistry Shoolini University Bajhol Solan India intitute of Material Science of Kaunas University of Technology Barsausko Kaunas Lithuania King Abdullah Institute for Nanotechnology King Saud University Riyadh KSA Department of physics Himachal Pradesh University Shimla India

After the discovery of hexagonal ferrites or hexaferrites, it has been become important materials commercially and technically to study which is still growing on. In this article, we have reviewed about the M-type hexaferrites including their structural, synthesis techniques and important magnetic properties. The role of experimental synthesizing techniques adopted for preparation of M-type hexaferrites on the various parameters studied in this review paper. The substitution of holonium in BaM ferrite reduces the value of coercivity but not saturation magnetization and ramanence and the cobalt-titanium substituted ferrites were the most important M-type ferrites in the field of application in microwave properties and magnetic field industry.

关键词： Hexagonal Structure Sol-Gel Synthesis Technique Co-Precipitation Technique TEM VSM

2000年7月中旬磁暴期间内等离子体层密度的扰动

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2000年7月中旬磁暴期间内等离子体层密度的扰动