Magnet alternating pole array magnetized by one side magnetization to boost magnetic attraction force
A flexible magnetic component can include a magnetizable powder including a rare earth element. The flexible magnetic component can also include a polymer binder. The flexible magnetic component can define a first surface and a second surface opposite the first surface. A first magnetic field adjacent to the first surface can have a field strength at least 3 times greater than a field strength of a second magnetic field adjacent to the second surface, and the flexible magnetic component can elongate greater than 20% before a permanent deformation occurs.
1. A flexible magnetic component, comprising:
a magnetizable powder comprising a rare earth element; and
a polymer binder;
wherein the flexible magnetic component has a first magnetic field strength adjacent to a first surface of the flexible magnetic component at least 3 times greater than a second magnetic field strength adjacent to a second surface of the flexible magnetic component opposite the first surface, the flexible magnetic component having a thickness of less than 0.3 millimeters and an attractive force per volume of greater than 20 N/cm 3 when disposed directly adjacent a substantially identical magnetic component.
2. The flexible magnetic component of claim 1 , wherein the first magnetic field strength is at least 4 times greater than the second magnetic field strength.
3. The flexible magnetic component of claim 1 , wherein the flexible magnetic component can elongate greater than 20% without plastic deformation.
4. The flexible magnetic component of claim 1 , wherein the polymer binder comprises at least one of a nitrile butadiene rubber material, a silicone material, or a fluoroelastomer material.
5. The flexible magnetic component of claim 1 , wherein the magnetizable powder comprises neodymium.
6. The flexible magnetic component of claim 1 , wherein the flexible magnetic component has a density of between 5 grams per cubic centimeter (g/cm 3 ) and 6.5 g/cm 3 .
7. The flexible magnetic component of claim 1 , further comprising:
a first portion having a first magnetic polarity;
a second portion disposed adjacent to the first portion, the second portion having a magnetic polarity that is opposite the first magnetic polarity; and
a third portion disposed adjacent to the first portion opposite the second portion, the third portion having a magnetic polarity that is opposite the first magnetic polarity.
8. The flexible magnetic component of claim 7 , wherein an entire amount of magnetic flux from a magnetic pole of the first portion to a magnetic pole of the second portion or the third portion passes predominantly through an interior of the flexible magnetic component and a single exterior surface defined by the first portion.
9. A flexible magnetic component, comprising:
a body defining a first surface and a second surface opposite the first surface, wherein:
a first magnetic field strength adjacent to the first surface is at least 3 times greater than a second magnetic field strength adjacent to the second surface, the first magnetic field strength being at least 1000 Gauss; and
the body experiences no permanent deformation upon being elongated more than 20%.
10. The flexible magnetic component of claim 9 , further comprising:
a first portion having a first magnetic polarity;
a second portion surrounding the first portion, the second portion having a magnetic polarity opposite the first magnetic polarity; and
a third portion surrounding the second portion, the third portion having the first magnetic polarity.
11. The flexible magnetic component of claim 9 , wherein the flexible magnetic component has a thickness of less than 0.3 millimeters.
12. The flexible magnetic component of claim 9 , wherein the flexible magnetic component is isotropically magnetized.
13. The flexible magnetic component of claim 9 , wherein the flexible magnetic component is isotropically magnetized in two spatial dimensions and anisotropically magnetized in a third spatial dimension.
14. The flexible magnetic component of claim 9 , wherein the body comprises a magnetizable powder comprising between 55 vol % and 75 vol % of the flexible magnetic component.
15. A securing system for a device, comprising:
a device enclosure comprising a magnetic material; and
a component comprising a flexible magnetic portion that is attracted to the magnetic material of the device enclosure, wherein:
the flexible magnetic portion defines a first surface and a second surface opposite the first surface;
a first magnetic field strength adjacent to the first surface is at least 3 times greater than a second magnetic field strength adjacent to the second surface, the first magnetic field strength capable of resisting a shear force per volume of greater than 10 N/cm 3 when disposed approximately 0.8 mm from a substantially identical magnetic component; and
the flexible magnetic portion having a thickness of less than 0.3 millimeters.
16. The securing system of claim 15 , wherein the flexible magnetic portion comprises:
a magnetizable powder including a rare earth element; and
a polymer binder.
17. The securing system of claim 15 , wherein the magnetic material comprises a sintered magnet.
18. The securing system of claim 15 , wherein:
the device enclosure comprises a watch housing; and
the component comprises a watch band.
19. The securing system of claim 18 , wherein:
the flexible magnetic portion comprises a first flexible magnetic portion; and
the component comprises a second flexible magnetic portion having a magnetic polarity opposite the magnetic polarity of the first flexible magnetic portion.
20. The securing system of claim 15 , wherein:
the device enclosure comprises an electronic device enclosure including a transparent portion overlying a display; and
the component comprises a cover for the transparent portion.