Forming inductor and transformer structures with magnetic materials using damascene processing for integrated circuits
View Patent ↗Methods and associated structures of forming microelectronic devices are described. Those methods may include forming a first layer of magnetic material and at least one via structure disposed in a first dielectric layer, forming a second dielectric layer disposed on the first magnetic layer, forming at least one conductive structure disposed in the second dielectric layer, forming a third layer of dielectric material disposed on the conductive structure, forming a second layer of magnetic material disposed in the third layer of dielectric material and in the second layer of dielectric material, wherein the first and second layers of the magnetic material are coupled to one another.
1. A structure comprising:
a first layer of magnetic material disposed in a first dielectric layer;
at least one first via is disposed in the first dielectric layer;
a barrier layer disposed in the at least one first via that is disposed in the first dielectric layer;
a conductive material disposed on the barrier layer in the first dielectric layer;
a second dielectric layer disposed on the first magnetic layer;
at least one second via and at least one conductive structure disposed in the second dielectric layer, the at least one second via and the at least one conductive structure comprising a barrier layer;
a conductive material disposed in the at least one second via and in the at least one conductive structure in the second dielectric layer;
a third layer of dielectric material disposed on the conductive structure and at least one second via in the second dielectric layer; and
a second layer of magnetic material disposed within a portions of the second and the third layer of dielectric material, wherein the first and second layers of the magnetic material are coupled to one another.
2. The structure of claim 1 wherein the magnetic material comprises CoZrTa, CoNbTa, NiFe, CoP, CoPB, CoPRe, CoZr, CoZr Mo, FeCoAlN, CoZrTaN, FeCoP, CoPW, CoPBW, FeTaN, FeCoBSi, FeCoZrO, FeCoHfO, FeCoTiO, CoTi, FeCoB, CoZrOx, NiCuZnFeOx and combinations thereof.
3. The structure of claim 1 further comprising a conductive bump coupled to the at least one via, wherein the conductive bump is disposed on a passivation layer disposed on the second layer of magnetic material.
4. The structure of claim 1 wherein at least one of the first, second and third dielectric layers comprises an ILD, wherein the ILD comprises a thickness of less than about 3.5 microns.
5. The structure of claim 1 wherein a distance between a top surface of the conductive structure disposed in the second dielectric layer and a bottom surface of the second layer of magnetic material comprises below about 0.5 micron.
6. The structure of claim 1 wherein a seed layer is disposed beneath the first and second layers of magnetic material.
7. The structure of claim 1 wherein the structure comprises a portion of a package substrate comprising a multilevel metallization CMOS structure.
8. The structure of claim 1 wherein the structure comprises a portion of at least one of an on-chip and an on-package voltage converter, an RF high-frequency circuit, an EMI noise reduction circuit and radar circuitry.