Research and development of hard magnetic/soft magnetic exchange spring membrane

The use of magnetic hard / soft switching exchange-spring includes a spring vertical exchange coupling, magnetoresistive, magnetostrictive, magnetic energy product, and many other effects of the exchange bias, has broad application prospects. At present this type of material is mainly used for producing permanent magnet materials, giant magnetostrictive materials, magneto-resistive materials. A major use of the Permanent Magnetic material is exchange-spring manufacture of high performance permanent magnet material. Require as large permanent magnet coercive force and saturation magnetization, the coercive force of the hard magnetic material is a relatively large, but lower than the saturation magnetization of soft magnetic material. The magnetic thin film exchange-spring hard magnetic phase with high coercivity, soft magnetic phase film with high saturation magnetization, combine them, good performance can be obtained a permanent magnet material, especially when the soft magnetic phase with a non-rare earth , the amount of rare earth can be saved, reducing the price of the alloy.

If the composition of the magnetic thin film magnetoresistive exchange-spring axis of magnetic anisotropy in the film plane and parallel to each other, the magnetization reversal in the process, the soft magnetic layer similar to a Bloch domain wall, the larger the deflection magnetic moment where farther from the interface such configuration facilitates generating a magnetic resistance. A non-ferromagnetic multi-layer film of alternating ferromagnetic layer / deposition configuration, since the multilayer film was found GMR effect, it has been speculated that domain walls can also be produced GMR. Experimentally found GMR stripe domains in the wall FePd effect. Hard / soft exchange-spring as GMR multilayer film has the following characteristics: in the exchange-spring GMR multilayer film, the soft magnetic layer similar to a Bloch wall; changing the size or thickness of the soft magnetic layer of the applied magnetic field, can be changing the width of the domain wall.

Conclusion In summary, hard / soft exchange-spring magnetic multilayers in applied research and infrastructure are significant. Theoretically, we can now nucleation process of magnetization and magnetization reversal nucleus exchange-spring to study the magnetic thin film, the growth and movement of the domain walls, which are clearer understanding. Technically speaking the application, the hard / soft spring effect of a number of exchange, the exchange coupling such as vertical, exchange bias, domain wall magnetoresistance, magnetostriction, the maximum energy product and the like, can be applied directly to the magnetic material.

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