Piezoelectrically-controlled integrated magnetic device
View Patent ↗The magnetic device according to the invention is integrated on a substrate and comprises at least one element made of piezoelectric material associated with actuating electrodes, and at least one magnetic element able to deform under the stress of the piezoelectric material element. The device has the form of a beam movable with respect to the substrate, and comprises two transverse parts of predetermined width, along a reference longitudinal axis. The piezoelectric material element is formed by at least a part of a transverse part and each transverse part comprises a zone for mechanical anchoring on the substrate. The transverse parts are connected by at least one central branch, of predetermined width, on which the magnetic element is arranged.
1. A variable-response magnetic device integrated on a substrate and comprising at least one element made of piezoelectric material associated with actuating electrodes, and at least one magnetic element able to deform under the stress of the element made of piezoelectric material, wherein the device is in the form of a beam, movable with respect to the substrate and comprising two transverse parts of predetermined width, along a reference longitudinal axis, and wherein:
the piezoelectric material element is formed by at least one part of a transverse part,
each transverse part comprises a zone for mechanical anchoring on the substrate,
and the transverse parts are connected by at least one central branch of predetermined width on which the magnetic element is arranged.
2. The device according to claim 1 , wherein the width of the central branch is smaller than the width of the transverse parts.
3. The device according to claim 1 , wherein the two transverse parts are made of piezoelectric material.
4. The device according to claim 1 , wherein the central branch is made of piezoelectric material.
5. The device according to claim 1 , wherein the actuating electrodes extend partially on the surface of the transverse parts of the beam.
6. The device according to claim 5 , wherein the actuating electrodes are situated on each side of the piezoelectric material element.
7. The device according to claim 1 , wherein each transverse part is extended by a transition zone extending up to the corresponding central branch.
8. The device according to claim 7 , wherein the transition zone is of variable cross-section.
9. The device according to claim 7 , wherein the transition zone has an elliptical shape tangent to the associated transverse part and central branch.
10. The device according to claim 7 , wherein the transition zone comprises a plurality of holes.
11. The device according to claim 1 , wherein each transverse part comprises a plurality of holes.
12. The device according to claim 1 , wherein the magnetic element comprises a uniaxial magnetic material having an axis of anisotropy parallel to the reference axis of the beam.
13. The device according to claim 1 , wherein the magnetic element comprises a uniaxial magnetic material having an axis of anisotropy perpendicular to the reference axis of the beam.
14. The device according to claim 1 , wherein the magnetic element has a cross-section of substantially rectangular shape.
15. The device according to claim 1 , wherein the magnetic element has a cross-section of substantially ellipsoid shape.
16. The device according to claim 1 , wherein the magnetic element is composed of a plurality of non-joined elemental magnetic elements arranged side by side on the central branch of the beam.
17. The device according to claim 1 , comprising at least one electrically conducting element associated with the magnetic element.
18. The device according to claim 17 , wherein the electrically conducting element is a solenoid coil.
19. The device according to claim 18 , wherein the coil surrounds the magnetic element.
20. The device according to claim 17 , wherein the electrically conducting element is a wire in the form of a serpentine.
21. The device according to claim 17 , wherein the electrically conducting element is a wire in the form of lines.
22. The device according to claim 17 , wherein the electrically conducting element is a wire in the form of a spiral.
23. The device according to claim 20 , wherein the electrically conducting element is located at a distance from the magnetic element.
24. The device according to claim 23 , wherein the electrically conducting element is arranged on one side of the magnetic element only.
25. The device according to claim 17 , wherein the electrically conducting element is arranged on both sides of and in contact with the magnetic element.
26. The device according to claim 1 , wherein the beam is encapsulated in a soft insulating material.