(3) the shape of magnetic anisotropy. The shape of the non-spherical symmetry of the magnetic body, the direction of self-demagnetization of the magnetic anisotropy.
magnetic anisotropy, magnetic anisotropy, stress magnetic anisotropy, shape magnetic anisotropy, induced magnetic Preparation of anisotropy and exchange of magnetic anisotropy.
where K1 and K2 for the magnetocrystalline anisotropy constant; αi said that the saturation magnetization Ms for three cubic axis direction cosine. Hexagonal system, Ek = Ku1sin2θ + Ku2sin4θ, θ is the angle between Ms and [0001] direction. The easy magnetization direction of the hexagonal crystal parallel to the [0001] axis, the easy magnetization axis only - called uniaxial crystal or uniaxial anisotropy. Then Ku1 and Ku2 G values. If the easy magnetization direction in the (0001) plane, a plane perpendicular to the hexagonal axis [0001] said the plane anisotropy at this time Ku1 and Ku2 negative.
(2) stress magnetic anisotropy. Magnetic anisotropy due to magnetoelastic coupling, magnetic alloys in the stress generated by the magnetostrictive effect. The mathematical expression of the stress magnetic anisotropy, magnetostriction coefficient λs magnetic saturation where; σ is the stress intensity, Pa.; θ is the angle of the magnetization direction away from the stress direction.
(5) the exchange of magnetic anisotropy. When the material anisotropy of ferromagnetic - antiferromagnetic (or ferrimagnetic) interface exchange coupling between the interface atoms, the iron magnet attached - Single ", which led to material asymmetric magnetic hysteresis loops, both sides of the coercive force is not equal. With cobalt - found that the anisotropy in amorphous alloys of cobalt oxide interface particulate and ferromanganese phosphorus boron aluminum.
(4) The induced magnetic anisotropy. Due to external causes - the permanent or temporary magnetic anisotropy. Many magnetic alloys, heat stress or magnetic field can produce a stress relief heat treatment or induced anisotropy of the magnetic field heat treatment. Even when the heat treatment under no external stress or without external magnetic field, is also available in magnetic domains and domain walls spontaneous magnetization under the conditions of induced anisotropy. Magnetic alloy by cold working to produce slip, can produce - uniaxial rolling induced magnetic anisotropy. Magnetic alloys under strong electron, proton or neutron irradiation, will produce irradiation induced magnetic anisotropy. Some thin magnetic film growth in the magnetic field or a particular environment, can be obtained film growth induced anisotropy. Induced magnetic anisotropy of magnetic alloys can be used to orderly theory of atoms in the direction to get a reasonable explanation.
(1) the magnetic anisotropy. Refers to the magnetic properties of single crystal magnetic anisotropy due to the anisotropic crystal structure, also known as crystal magnetic anisotropy. In the crystal, the regular arrangement of atoms or ions, resulting in non-uniform electrostatic field of space periodic variation world pie network information , its the movement of electrons in atoms have a significant impact. Crystal atomic magnetic moment is mainly from the total magnetic moment of the electron spin, electron spin and orbital motion of the electrons are coupled world pie network information , there is exchange interaction between neighboring atomic electron orbitals, these movements with the atomic magnetic moments in the lattice orientation are very different, which is to generate the magnetic anisotropy of the reasons. Usually the strength of the magnetic anisotropy of the magnetic body, the magnetic anisotropy constant K with the magnetic body hard magnetization direction (axis) of the magnetic anisotropy energy is proportional to the magnetic anisotropy of the available mathematical style statements. Cubic crystal magnetic anisotropy Ek
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magnetic anisotropy (magnetic anisotropy) relative to the objects in a given reference frame, objects in different directions with different magnetic phenomena. Magnetic anisotropy on the magnetization characteristics of magnetic alloy technology (such as permeability, coercivity, etc.) have a significant impact, so it is important to the basic magnetic properties -. Magnetic anisotropy due to the magnetic moments of atoms or ions directly or indirectly, and lattice coupling, it is closely associated with the electronic states of magnetic ions in a magnetic object. Within the ferromagnetic objects can change with the spontaneous magnetization direction changes. A stress-free spherical ferromagnet along a - the direction of the magnetic neutral state magnetized to saturation, the energy per unit volume that the direction of the magnetic anisotropy. Spontaneous magnetization can the direction of the lowest point when the external magnetic field, the magnetic anisotropy energy to the lowest in the direction called the easy magnetization direction (axis). The magnetic anisotropy energy direction that the hard magnetization direction (axis). Usually with the easy magnetization direction of the energy difference of the direction of the magnetic anisotropy energy. In units of the J / m3.