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Modulation method being able to achieve magnetic torque nonvolatile orientation of magnetic film

A magnetic thin film and magnetic moment technology, applied in the manufacture/assembly of magnetostrictive devices, material selection for magnetostrictive devices, magnetostrictive devices, etc., can solve the problem of magnetic thin films affecting multiferroic heterojunctions. To achieve the effect of light weight, small volume and simple structure

Active Publication Date: 2015-05-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

On the one hand, the above control method can only realize the non-volatile transition of two different states; on the other hand, when the applied electric field is lower than the coercive electric field of PZT ceramics, the strain generated by PZT is small, and the residual strain after the external electric field is removed is smaller, so the difference between the two residual strain states is not too large, which affects the control effect on the magnetic moment of the magnetic film in the multiferroic heterojunction

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  • Modulation method being able to achieve magnetic torque nonvolatile orientation of magnetic film

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Embodiment Construction

[0027] A multiferroic heterojunction that can realize three-state non-volatile magnetic moment control is composed of a polycrystalline PZT ceramic substrate containing defective dipoles, a FeSiBC magnetic film and silver colloid. The polycrystalline PZT ceramic substrate containing defect dipoles is prepared by acceptor doping during the preparation of PZT ceramics to generate oxygen vacancies inside the ceramics, oxygen vacancies and dopant ions form defect dipoles, and then undergo electrode chemical and aging treatments.

[0028] The preparation method of the above-mentioned multiferroic heterojunction and the modulation method of realizing the non-volatile orientation of the magnetic moment of the magnetic film based on the multiferroic heterojunction are as follows:

[0029] Step 1: The polycrystalline PZT ceramic substrate containing defective dipoles adopts piezoelectric ceramics customized from the Shanghai Institute of Ceramics, and its coercive electric field is abo...

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Abstract

The invention provides a multi-ferric heterojunction and a modulation method for achieving magnetic torque nonvolatile orientation of magnetic film based on the multi-ferric heterojunction, and belongs to the technical field of electronic material. The multi-ferric heterojunction uses cheap polycrystal PZT ceramic containing defect dipoles as a piezoelectric substrate, an elargol is coated on one side thereof for being used as an electrode, the other side is polished and then plated or glued with a magnetic film having magnetostriction features; the polycrystal PZT ceramic substrate containing the defect dipoles is obtained by polarizing and aging the polycrystal PZT ceramic substrate after being acceptor doped. By applying a specific voltage pulse to the multi-ferric heterojunction, three nonvolatile transformation states can be generated in the magnetic film after removing the externally applied voltage, thus achieving the stable nonvolatile magnetic torque modulation effect. The modulation method is simple and convenient in operation, easy to be achieved, and good in modulation effect; the modulation method has a wide application range in the field of nonvolatile electric field pulse modulation magnetic devices.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a multiferroic heterojunction and a modulation method for realizing the nonvolatile orientation of the magnetic moment of a magnetic thin film based on the multiferroic heterojunction. Background technique [0002] It is of great research and technical application value to control the orientation of the magnetic moment in the magnetic thin film, and then change the performance of the corresponding magnetic device. The traditional method of adjusting the orientation of the magnetic moment in the magnetic material is to apply an external magnetic field to turn the magnetic moment, but the external magnetic field needs to be realized by using an electromagnet, which is not only large in size and heavy in weight, but also requires a current to generate a magnetic field, which consumes a lot of energy. . [0003] In recent years, the emergence of multiferroic...

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Application Information

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IPC IPC(8): H01L41/12H01L41/20H01L41/47
Inventor 苏桦沈洁唐晓莉荆玉兰李元勋钟智勇张怀武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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