Progress in ferromagnetism research
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書誌事項
Progress in ferromagnetism research
Nova Science Publishers, c2006
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HTTP:URL=http://www.loc.gov/catdir/toc/ecip0511/2005011338.html Information=Table of contents
内容説明・目次
内容説明
Ferromagnetism is a form of magnetism that can be acquired in an external magnetic field and usually retained in its absence, so that ferromagnetic materials are used to make permanent magnets. A ferromagnetic material may therefore be said to have a high magnetic permeability and susceptibility (which depends upon temperature). Examples are iron, cobalt, nickel, and their alloys. Ultimately, ferromagnetism is caused by spinning electrons in the atoms of the material, which act as tiny weak magnets. They align parallel to each other within small regions of the material to form domains, or areas of stronger magnetism. In an unmagnetised material, the domains are aligned at random so there is no overall magnetic effect. If a magnetic field is applied to that material, the domains align to point in the same direction, producing a strong overall magnetic effect. Permanent magnetism arises if the domains remain aligned after the external field is removed. Ferromagnetic materials exhibit hysteresis. In 2004, it was discovered that a certain allotrope of carbon, nanofoam , exhibited ferromagnetism. The effect dissipates after a few hours at room temperature, but lasts longer at cold temperatures. The material is also a semiconductor. It is thought that other similarly formed materials, of boron and nitrogen, may also be ferromagnetic. This new book rings together leading research from throughout the world.
目次
- Fully Polarised States and Decoherence
- Ferromagnetism in Undoped Manganites
- Difference Equations for Correlation Functions and Form Factors of the Eight-Vertex/XYZ Model
- Basic Properties of Spin Injection and Transport in Ferromagnetic/Polymer Systems
- Theory of Spintronic Transport in Magnetic Tunnel Junctions
- Ferromagnetic Phase Transition in Spinor Bose Gases
- Giant Oscillations of the Density of States and the Conductance in a Ferromagnetic Conductor Coupled to two Superconductors
- The Effect of Geometry on the Magneto-Transport Properties of Insulating Granular Ferromagnets
- Many-Particle Effects in Half-Metallic Ferromagnets
- Phases and Phase Transitions in Spin-Triplet Ferromagnetic Superconductors
- Field and Stress -Tuneable Microwave Composite Materials Based on Ferromagnetic Wires
- Phase Diagram and Magnetic Properties of Ferromagnetic Shape Memory Alloys
- Spin Polarised States in Nuclear Matter with Skyrme Effective Interaction.
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