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Exchange bias for ferromagnetic/antiferromagnetic bilayers with the uniaxial anisotropy being misaligned with the exchange anisotropy

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Science China(Physics,Mechanics & Astronomy) 2009年第12期52卷 1885-1892页

作者： BAI YuHao1 & YUN GuoHong1,2 1 College of Physical Science and Technology,Inner Mongolia University,hohhot 010021,China 2 Key Laboratory of Physics and Chemistry of Functional Materials,College of Physics and Electronic Information,Inner Mongolia Normal University,hohhot 010022,China College of Physical Science and Technology Inner Mongolia University Hohhot China Key Laboratory of Physics and Chemistry of Functional Materials College of Physics and Electronic Information Inner Mongolia Normal University Hohhot China

Using the principle of minimal energy and S-W model,the exchange bias for ferromagnetic/antiferro-magnetic bilayers has been investigated when the uniaxial anisotropy is misaligned with the exchange anisotropy. According to the relation between the energy of the bilayer and the orientation of ferro-magnetic magnetization,it is found that the bilayer will be in the monostable state or bistable state when the external field is absent in the initial magnetization state. The monostable state or bistable state of the bilayer,which determines the angular dependence of exchange bias directly,is controlled by the competition between the exchange anisotropy and uniaxial anisotropy. When the applied field is parallel to the intrinsic easy axes and intrinsic hard axes,one of the switching fields of the hysteresis loop shows an abrupt change,while the other keep continuous by analyzing the magnetization reversal processes. Consequently,the exchange bias field and the coercivity will show a jump phenomenon. The numerical calculations indicate that both the magnitude and direction of the exchange anisotropy will significantly affect the angular dependence of exchange bias. The jump phenomenon of exchange bias is an intrinsic property of the bilayer,which is dependent on the interfacial exchange-coupling constant,the orientation of the exchange anisotropy,the thickness and uniaxial anisotropy constant of the ferromagnetic layer.

关键词： monostable state bistable state intrinstic easy axis intrinstic hard axis switching field

New Diterpenoid Alkaloids from the Roots of Aconitum excelsum Reichb

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Chinese Chemical Letters 1999年第2期10卷 133-134页

作者： Shu Xiang ZHANG Shi Shan JIA(Pharmcy Department, Inner Monglia Medical College hohhot, Inner Monglia, China 010059) Pharmcy Department Inner Monglia Medical College Hohhot Inner Monglia 010059 China

Two new diterpenoid alkaloids have been isolated from roots of Aconitum excelsum Reichb. These new compounds were named excecoitine I and exceconidine II. The two structures were elucidated by spectroscopic methods as... 详细信息

关键词： diterpenoid alkaloids exceconitine exceconidine

ISSUES CONCERNING THE MANAGEMENT AND THE DEVELOPMENT OF ARID AND SEMIARID LAND IN CHINA

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干旱区资源与环境 1993年第Z1期7卷 406-411页

作者： Wang Jiuwen Institute of Desert Control, Inner Mongolia Forestry College, hohhot 010019

The arid and semiarid land in China covers a vast area, about 3.5 million km^2(not coun-ting the Tibet Plateau),where natural resources are very aboundant. In this area, the totalsolar radiation is as high as 140--160 kilocalorie / cm^2. a. There are about 167 million ha ofvarious grasslands, accounting for nearly 60% of the national grassland area.

关键词： Arid and Semiarid Land Environmental Management Resources Development

A RESEARCH ON THE DYNAMIC MONITORING SYSTEM FOR FORAGE-LIVESTOCK BALANCE IN THE TEMPERATE CRASSLAND OF CHINA

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干旱区资源与环境 1993年第Z1期7卷 275-278页

作者： Li Bo Shi Peijun Lin Xiaoquan Grassland Research Institute, Chinese Academy of Agricultural Sciences, hohhot, China Beijing Normal University, China GRI, Chinese Academy of Agricultural Sciences, hohhot

Some principles and methods for the dynamic monitoring of forage-livestock bal-ance in the grazing system on the temperate grassland of China were discussed in thispaper. To prepare a dynamic monitoring system or the ... 详细信息

关键词： Temperate Grassland Forage-Livestock Balance Remote Sensing Estimaion for Production Grassland Dynamic Monitoring

ANALYSIS OF MONGOLIAN PLATEAU LANDSCAPE ECOLOGICAL REGION

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干旱区资源与环境 1993年第Z1期7卷 262-268页

作者： Liu Zhongling Natural Resources Institute, Inner Mongolia University, hohhot, Inner Mongolia, China

Mongolian Plateau is located in the center of Asia, remote from oceans and sur-rounded by mountains of various heights. It is a closed inland plateau and a special land-scape ecological region in the Euro-Asia Continent. Mongolian Plateau includes the landof the Republic of Mongolian and Inner Mongoilia of China. It covers a area of 34°36′longitude (E87°40′-E122°15′) and 15°22′latitude (N37°46′-N53°08′). Thispaper briefly describes the landscape feature and ecological division of this region.

关键词： Mongolian Platean Landscape Ecologic Region

Discrimination of intra/extracellular sidedness segments of transmembrane proteins

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生物物理学报 2009年第S1期25卷 193-194页

作者： Wei Chen, Liao-fu Luo School of Physical Science and Technology, Inner Mongolia University, hohhot 010021, China

Topology of the transmembrane protein is closely related to its functions. So, it is desiderated to depict the topology of transmembrane proteins. In this work, an effective approach

关键词： transmembrane protein topology increment of diversity quadratic discriminant analysis

A Study of Spatial Variability on Aquifer Hydraulic Conductivity K

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Acta Geologica Sinica(English Edition) 1995年第2期69卷 197-207页

作者： Chaolunbagen, Hetai and Liu TingxiDept. of Water Conservancy, Inner M ongolia College of Agriculture and Animal Husbandry, hohhot, Nei M ongol Shang Ruoyun Dept. of Water Conservancy Inner Mongolia College of Agriculture and Animal Husbandry Hohhot Nei Mongol

A structural analysis of K of an aquifer system in the study area is presented, and the main direction and degree of the variability of K are found by using the unstationary regionalized variable theory of geostatistics. Optimal estimation of K has been made by universal kriging method (U K M ). Both spatial variability distribution map and division map of K are given.

关键词： regionalized variable variogram geostatistics spatial variability

PROPER EFFICIENCY OF NONCONVEX VECTOR OPTIMIZATION PROBLEMS

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Systems Science and Mathematical Sciences 1998年第1期11卷 18-25页

作者： RONG Weidong (Department oI Mothematics, Inner Mongolio Uuiversitg, hohhot O10021, China) 内蒙古大学数学系内蒙古包头

In topological vector spaces, we estalish a Lagrange Multiplier Theorem forproper efficiency of nonconvex vector opti mization problems. The saddle point theoremsfor the scalar-valued Lagrangian fonction are derived. ... 详细信息

关键词： Vector optimization proper efficiency cone-subconvexlikeness LagrangeMultiplier Theorem saddle point theorem duality

Complex genetic algorithm in continuous space

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Chinese Science Bulletin 1999年第10期44卷 954-960页

作者： LI Qiang and ZHOU Ji Department of Mechanical Engineering, Inner Mongolia Polytechnic University, hohhot 010062, China CAD Center, Huazhong University of Science and Technology , Wuhan 430072, China Department of Mechanical Engineering Inner Mongolia Polytechnic University Hohhot China CAD Center Huazhong University of Science and Technology Wuhan China

A new artificial intelligent optimization method, complex genetic algorithm, is presented, and the theoretical analysis for the effective optima-seeking mechanism of the algorithm is finished. The example calculation ... 详细信息

关键词： continuous space complex genetic algorithm artificial intelligent optimization.