Magnetic nanofiber composite materials and devices using same

Patent metadata

Field	Value
Publication number	US-9620839-B2
Application number	US-201615082901-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	Jul 20, 2015
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A nonreciprocal device is described. It includes a housing, a waveguide layer and at least one layer of magnetic nanofiber composite. The magnetic nanofiber composite layer is made up of a polymer base layer, a dielectric matrix comprising magnetic nanofibers. The nanofibers have a high aspect ratio and wherein said dielectric matrix is embedded in the polymer base layer.

First claim

The embodiment of the invention in which an exclusive property or privilege is claimed is defined as follows:

1. A tunable nonreciprocal device comprising:
a housing;
a waveguide layer; and
at least one layer of magnetic nanofiber composite wherein said magnetic nanofiber composite layer comprises:
a polymer base layer;
a dielectric matrix comprising coated magnetic nanofibers;
wherein said nanofibers have an aspect ratio of at least 100 to 1 length to width and wherein said dielectric matrix is embedded in the polymer base layer.

2. The device of claim 1 wherein said dielectric matrix further comprises nanoparticles.

3. The device of claim 1 wherein said nanofibers are flexible.

4. The device of claim 1 wherein said dielectric matrix comprises a self-biased magnetic material.

5. The device of claim 1 further comprising high dielectric constant nanoparticles dispersed within the dielectric matrix.

6. The device of claim 5 wherein said high dielectric constant nanoparticles are dispersed in the dielectric matrix between the nanofibers wherein the nanofibers are substantially parallel.

7. The device of claim 1 wherein each of said coated nanofibers comprising the dielectric matrix in turn comprises a shell and a magnetic core.

8. The device of claim 7 wherein said shell comprises an insulating coating comprises a sputtered layer of aluminum oxide.

9. The device of claim 7 wherein said coated nanofibers are insulated from direct contact with each other.

10. A tunable microwave circulator comprising:
a housing;
a waveguide layer; and
at least one layer of magnetic nanofiber composite wherein said magnetic nanofiber composite layer comprises:
a polymer base layer;
a dielectric matrix comprising coated magnetic nanofibers;
wherein said nanofibers have an aspect ratio of at least 100 to 1 length to width and wherein said dielectric matrix is embedded in the polymer base layer.

11. The circulator of claim 10 wherein said circulator comprises a microstripline device.

12. The circulator of claim 10 wherein said circulator comprises a stripline device having two layers of magnetic nanofiber composite.

13. The circulator of claim 10 wherein said dielectric matrix further comprises nanoparticles.

14. The circulator of claim 10 wherein said circulator excludes a permanent bias magnet and a ferrite magnetic core.

15. The circulator of claim 10 wherein said nanofibers comprising the dielectric matrix comprise a shell and a magnetic core and wherein said shell acts as an insulator.

16. The circulator of claim 15 wherein said shell comprises an insulating coating comprises a sputtered layer of aluminum oxide.

17. The circulator of claim 15 wherein said coated nanofibers are insulated from direct contact with each other.

18. A tunable nonreciprocal device consisting of:
a housing;
a waveguide layer defining several ports; and
one layer of magnetic nanofiber composite wherein said magnetic nanofiber composite layer comprises:
a polymer base layer;
a dielectric matrix comprising coated magnetic nanofibers;
wherein said nanofibers have an aspect ratio of at least 100 to 1 length to width and wherein said dielectric matrix is embedded in the polymer base layer.

19. The device of claim 18 wherein said nanofibers comprising said magnetic nanofiber composite layer are substantially parallel to one another within said nanofiber composite layer.

Assignees

• Chen Xing
• Zhou Ziyao
• Uchicago Argonne Llc

Inventors

• Chen Xing
• Zhou Ziyao

Classifications

• D01D5/0007 Primary

  Electro-spinning (non-woven fabrics produced by electro-spinning D04H1/728) · CPC title

• D10B2401/00

  Physical properties · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B33Y10/00 Primary

  Processes of additive manufacturing · CPC title

• H01P1/387 Primary

  Strip line circulators · CPC title