Fabrication of anisotropic nanocomposite rare earth permanent magnetic multilayers for the first time

Recently, metal CAS Shenyang National Laboratory for Materials Science in the magnetism and magnetic materials research department of scientific research personnel in the first successful prepared hard magnetic phase, soft magnetic phase and isolation layer composed of anisotropic nano composite rare earth permanent magnetic multilayers.

It is very important to study the exchange coupling mechanism and continue to improve the magnetic properties of the nanocomposite magnets.

The magnetic properties of the soft magnetic material characteristics like tall skinny, and the magnetism of magnetic material can characteristics as short stature fat. Ideas of nanocomposite permanent magnetic material is a joint combat group composed of the two fat and scrag, which can make full use of their respective advantages. To achieve this purpose, the fat and the thin to combine together, it is best to a one in nanometer scale neatly arranged. But it would also have to break through several technical difficulties.

First of all, to let the soft magnetic materials He Yongci materials neatly arranged, need to grow at high temperature materials, and high temperature will lead to the diffusion of elements between different materials, so as not to form two different phases. Magnetism and magnetic materials research department of scientific research personnel using magnetron sputtering method on the heated substrate growth orientation of the hard magnetic layer, and the insertion of the idea of a nonmagnetic spacer layer between the soft and hard magnetic layer, which successfully prepared hard magnetic phase and the soft magnetic phase and isolation layer of anisotropic nano composite multilayer films.

On the basis of this, researchers also studied the non-magnetic interlayer and a hard magnetic layer thickness, hard magnetic phase and non magnetic material layer and hard magnetic layer texture effects of the effective critical correlation length and soft magnetic hard magnetic layer and interlayer exchange coupling.

The successful fabrication of anisotropic nanocomposite multilayer films and the related work of the indirect and long-range exchange coupling have attracted the attention of the international counterparts, and promote the improvement of the magnetic properties of the permanent magnet. Anisotropic nanocomposite permanent magnetic thin films can be directly applied to micro motors and sensors. If this method can be successfully applied to the bulk material, the cost of rare earth permanent magnet materials will be greatly reduced, thus the huge economic benefits can be achieved.