Unlock instant, AI-driven research and patent intelligence for your innovation.

Magnetic bias film and magnetic sensor using the same

A magnetic sensor and magnetic bias technology, which is applied to the size/direction of the magnetic field, the use of electromagnetic devices for magnetic field measurement, and the direction of the magnetic layer.

Inactive Publication Date: 2009-10-07
PANASONIC CORP
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, at this time, there is a problem that the magnetic field generated by the magnetic bias film becomes smaller, so that the desired magnetic field cannot be obtained.
Moreover, there is also a problem that if a large magnetic field is applied to such a magnetic bias film from the outside, the direction of the magnetic bias will be affected, thereby affecting the output of the magnetic sensor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnetic bias film and magnetic sensor using the same
  • Magnetic bias film and magnetic sensor using the same
  • Magnetic bias film and magnetic sensor using the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0039] figure 1 It is a plan view of the magnetic bias film in the first embodiment of the present invention. This magnetic bias film 9 includes a plurality of magnetic bias magnets 9A to 9G, and these magnetic bias magnets 9A to 9G each generate a magnetic field in the direction along the arrow A (x direction).

[0040] The magnetic bias magnets 9A to 9G are made of a CoPt alloy, and have a substantially rectangular parallelepiped shape in which the long side, short side, and thickness (in the lamination direction) become shorter in order. Here, "approximately" a rectangular parallelepiped means not only a mathematically perfect rectangular parallelepiped, but also refers to, for example, curvature, ridgelines or rounded or chamfered corners at the vertex, surface Concave and convex, etc., but still in the shape of a cuboid as a whole. Among them, due to the limitation of manufacturing technology, the bottom area of ​​the magnetic bias magnets 9A-9G is larger than the top ...

no. 2 Embodiment

[0061] image 3 It is a perspective view of the magnetic bias film in the second embodiment of the present invention. exist image 3 Among them, the magnetic bias film 11 has a structure in which magnetic layers 12 and non-magnetic layers 13 are alternately laminated in multiple layers. Here, the magnetic layer 12 is made of a CoPt alloy, and by magnetizing in a fixed direction, a magnetic field is generated in the direction of the arrow A (x direction). The nonmagnetic layer 13 is made of Cr. Strictly speaking, Cr is an antiferromagnetic (antfferromagnetic) body and not a non-magnetic body, but considering that it is not a ferromagnetic body, the term "non-magnetic" is also used for Cr below.

[0062] The length of each side in this embodiment, the long side (x direction) is 700 μm, the short side (y direction) is 140 μm, and the magnetic layer 12 of thickness (z direction) is The non-magnetic layer 13 is The aspect ratio of the long side to the short side of the magne...

no. 3 Embodiment

[0089] Figure 7 It is a perspective view of the magnetic bias film in the third embodiment of the present invention. The magnetic bias film 11 in the third embodiment of the present invention includes a plurality of magnetic bias magnets 11A to 11C, and generates a magnetic field in the direction of arrow A (x direction). The magnetic bias magnet 11A is formed by alternately laminating multiple layers of magnetic layers 12 made of CoPt alloy and non-magnetic layers 13 made of Cr, and has a long side (y direction), a short side (x direction) and a magnetic bias film 11A. The thickness (z direction) of the lamination direction becomes shorter in order, and the approximate rectangular parallelepiped shape.

[0090] In this embodiment, the length of each side is 700 μm for the long side (y direction) and 140 μm for the short side (x direction), and the intervals between the bias magnets 11A and 11B, 11B and 11C are 10 μm, respectively. Furthermore, in thickness (z direction), t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a magnetic bias film and a magnetic sensor using the magnetic bias film. The magnetic bias film (9) has a substantially rectangular parallelepiped shape including a magnetic layer, processed into long sides, short sides, and thicknesses (in the direction of lamination) that are sequentially shortened, and generates a magnetic field in a plane perpendicular to the direction of lamination of the magnetic layers. The magnetic bias magnet (11). Moreover, the ratio of the length of the long side to the short side of the magnetic bias magnet (11) is between 5 and 200.

Description

technical field [0001] The present invention relates to a magnetic bias film used in various electronic devices and a magnetic sensor using the magnetic bias film. Background technique [0002] As a conventional magnetic sensor, there is, for example, a magnetic sensor disclosed in Japanese Patent Laid-Open Publication No. 2003-14458. Figure 19 It is a perspective view of a conventional magnetic sensor, Figure 20 yes Figure 19 The shown conventional magnetic sensor is a sectional view taken along the line II-II'. [0003] The structure of the magnetic sensor includes: a Wheatstone bridge circuit (Wheatstone bridge circuit) 3 composed of four detection elements 2A-2D arranged on the top surface of the substrate 1, covering the substrate with the Wheatstone bridge circuit 1 and the support (holder) 4 holding the substrate 1 is composed of a predetermined number of conductive wires wound around the support 4, and is orthogonal to each other, and is used to apply a magnetic ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01F10/16G01R33/06
Inventor 林信和尾中和弘仲尾幸夫田川正孝锅谷公志山口雅子
Owner PANASONIC CORP