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Poly iron performance composed film reading magnetic head based on magnetoelectric effect

A technology of composite thin film and magnetoelectric effect, applied in the direction of magnetic head and magnetic recording head using thin film, can solve the problems of complex structure, high energy consumption, external bias magnetic field, etc., and achieve the effect of simple structure

Inactive Publication Date: 2008-08-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a multiferroic composite film read head based on magnetoelectric effect, aiming at the problems that the existing magnetoresistance effect reading head needs an external bias magnetic field, complex structure and high energy consumption.

Method used

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  • Poly iron performance composed film reading magnetic head based on magnetoelectric effect
  • Poly iron performance composed film reading magnetic head based on magnetoelectric effect
  • Poly iron performance composed film reading magnetic head based on magnetoelectric effect

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Using the method of pulsed laser deposition, strontium titanate (SrTiO 3 ) on the substrate to deposit a multiferroic composite thin film, and the first layer to deposit barium titanate (BaTiO 3 ), the second layer deposits nickel ferrite (NiFe 2 o 4 ), forming the structure shown in Figure 3(a). Barium titanate (BaTiO 3 ) layer thickness of 110nm, nickel ferrite (NiFe 2 o 4 ) layer thickness is 40nm. In the perturbed magnetic field δH ac When the frequency is 1000Hz, the magnetoelectric response δV varies with the perturbation magnetic field δH ac The variation of the amplitude is as Image 6 Shown by α E =δV / (δH ac t) (t is the film thickness) calculates that the in-plane magnetoelectric conversion coefficient of the multiferroic composite film read head is 39.2mV / cm Oe, and the out-of-plane magnetoelectric conversion coefficient is 43.9mV / cm Oe.

Embodiment 2

[0047] Using the method of pulsed laser deposition, strontium titanate (SrTiO 3 ) on the substrate to deposit a multiferroic composite film, the first layer deposits nickel ferrite (NiFe 2 o 4 ), the second layer deposits barium titanate (BaTiO 3 ), forming the structure shown in Figure 3(b). Nickel Ferrite (NiFe 2 o 4 ) layer thickness of 40nm, barium titanate (BaTiO 3 ) layer thickness is 75nm. In the perturbed magnetic field δH ac When the frequency is 1000Hz, the magnetoelectric response δV varies with the perturbation magnetic field δH ac The variation of the amplitude is as Figure 7 Shown by α E =δV / (δH ac t) (t is the film thickness) calculates that the in-plane magnetoelectric conversion coefficient of the multiferroic composite film read head is 4.9mV / cm Oe, and the out-of-plane magnetoelectric conversion coefficient is 5.3mV / cm Oe.

Embodiment 3

[0049] Using the method of pulsed laser deposition, strontium titanate (SrTiO 3 ) on the substrate to deposit a multiferroic composite thin film, and the first layer to deposit barium titanate (BaTiO 3 ), the second layer deposits nickel ferrite (NiFe 2 o 4 ), forming the structure shown in Figure 3(a). Barium titanate (BaTiO 3 ) layer thickness of 100nm, nickel ferrite (NiFe 2 o 4 ) layer thickness is 30nm. In the perturbed magnetic field δH ac When the frequency is 1000Hz, the magnetoelectric response δV varies with the perturbation magnetic field δH ac The variation of the amplitude is as Figure 8 Shown by α E =δV / (δH ac t) (t is the film thickness) calculates that the in-plane magnetoelectric conversion coefficient of the multiferroic composite film read head is 44mV / cm Oe, and the out-of-plane magnetoelectric conversion coefficient is 79mV / cm Oe.

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Abstract

The invention relates to a magnetoelectric effect-based multiferroic composite film read magnetic head, which comprises a ferroelectric oxide layer grown on a substrate and a magnetic layer. A plurality of proposals for the structure of the read magnetic head are provided as follows: the ferroelectric oxide layer grown on the substrate serves as the first layer and the magnetic layer as the second layer, which forms the first structural unit; or the magnetic layer grown on the substrate serves as the first layer and the ferroelectric oxide layer as the second layer, which forms the second structural unit; the first structural units are repeatedly stacked on the substrate; the second structural units are repeatedly stacked on the substrate; a ferroelectric oxide layer is then stacked on the first structural units which are repeatedly stacked on the substrate; a magnetic layer is then stacked on the second structural units which are repeatedly stacked on the substrate, and a magnetic layer is grown on the ferroelectric oxide substrate. Compared with a conventional read magnetic head, the multiferroic composite film read magnetic head has the advantages that no external bias magnetic field is needed, the structure is simple, and no energy is consumed.

Description

technical field [0001] The invention belongs to the field of preparation and application of multiferroic magnetoelectric composite films, and relates to a multiferroic composite film with a simple structure and the application of a reading head using the magnetoelectric effect based on the novel multiferroic film. Background technique [0002] A magnetic sensor in a broad sense is a device that converts changes in the magnetic properties of sensitive components caused by magnetic fields, currents, stress and strain, temperature, light, etc. into electrical signals, and detects corresponding physical quantities in this way. A general magnetic sensor is a device used to detect the existence of a magnetic field, measure the strength of a magnetic field, determine the direction of a magnetic field, or determine whether there is a change in the direction of the strength of a magnetic field. With the rapid development of information industry, transportation, medical equipment, etc...

Claims

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Application Information

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IPC IPC(8): G11B5/31
Inventor 南策文张毅马静邓朝勇李峥林元华
Owner TSINGHUA UNIV
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