Magnetic trap for cylindrical diamagnetic materials

Patent metadata

Field	Value
Publication number	US-9424971-B2
Application number	US-201514856712-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Mar 13, 2013
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A method for self-aligning diamagnetic materials includes contacting first and second magnets together other along a contact line so as to generate a diametric magnetization that is perpendicular to the contact line. A diamagnetic rod is positioned with respect to the first and second magnets to levitate above the contact line of the first and second magnets.

First claim

What is claimed is:

1. A method of arranging a diamagnetic rod comprising:
arranging first and second magnets on a substrate so as to form an array of magnetic traps defining a template for self-assembling diamagnetic material, each of the first and second magnets extending along a longitudinal direction to define a magnet length;
depositing a plurality of diamagnetic rods onto the array of magnetic traps;
capturing, by the array of magnetic traps, a number of captured diamagnetic rods, among the plurality of diamagnetic rods, corresponding to a number of magnetic traps in the array of magnetic traps;
levitating the captured diamagnetic rods in a vertical direction perpendicular above a contact line located where the first magnet contacts the second magnet, the first magnet and the second magnet having a diametric magnetization in a direction perpendicular to the contact line and the longitudinal direction so as to generate a longitudinal energy potential that traps the diamagnetic rod along the longitudinal direction so as to filter a rod length of the diamagnetic rod based on the magnet lengths,
wherein the longitudinal energy potential confines the diamagnetic rod in a three-dimensional confinement within the magnetic trap and positions the diamagnetic rod being levitated above the contact line against a target substrate to form wiring on the target substrate to perform to self-assembling process, and
wherein the first magnet and the second magnet make up one magnetic trap among an array of magnetic traps mounted on a template substrate.

2. The method of claim 1 , further comprising oscillating the trapped rod along the longitudinal axis to measure a magnetic susceptibility of the rod.

3. The method of claim 2 , further comprising determining the magnetic susceptibility of the rod based on a magnetic field due to a single cylindrical diametric.

4. The method of claim 3 , further comprising:
cleaning the template substrate to remove from the template substrate any un-captured diamagnetic rods among the plurality of diamagnetic rods.

5. The method of claim 4 , further comprising:
bringing the captured diamagnetic rods into contact with a target substrate to form wiring on the target substrate.

6. The method of claim 1 , further comprising wherein the longitudinal energy potential produced having a camel-back shaped energy profile.

7. The method of claim 6 , wherein the camel-back shaped energy profile includes a trough region interposed between a pair of peak regions.

8. The method of claim 7 , wherein the diamagnetic rod is levitated at approximately the trough portion.

9. The method of claim 8 , wherein the camel-back shaped energy profile determines that the rod length of the trapped diamagnetic rod satisfies a length ratio with respect to the magnet length.

Assignees

• IBM

Inventors

• Cao Qing
• Gunawan Oki

Classifications

• H10P74/20

  characterised by the properties tested or measured, e.g. structural or electrical properties · CPC title

• H10P14/40

  of conductive or resistive materials · CPC title

• H10W20/0554

  of nanotubes or nanowires · CPC title

• H10W20/4462

  Carbon or carbon-containing materials, e.g. graphene · CPC title

• H10W20/069

  by forming self-aligned vias or self-aligned contact plugs · CPC title