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ION MILL

 

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PETS Inc. Ion Milling System.

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Key Benefits

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Description

MODEL #

2"Gun & System

PETS-IM-2

5" Gun & System

PETS-IM-5

8" Gun & System

PETS-IM-8

In simple terms ion beam milling can be viewed as an atomic sand blaster.

The grains of sand are actually submicron ion particles accelerated to bombard the surface of the work mounted on a rotating table inside a vacuum chamber. The work is typically a wafer, substrate or element that requires material removal by atomic sandblasting or dry etching.

A selectively applied protectant, photo sensitive resist, is applied to the work element prior to introduction into the ion miller. The resist protects the underlying material during the etching process which may be up to eight hours or longer, depending upon the amount to be removed and the etch rate of the materials. Everything that is exposed to the collimated ion beam (may be 15" in diameter in some equipment) etches during the process cycle, even the resist.

In most micromachining applications the desired material to be removed etches at a rate 3 to 10 times faster than the resist protectant thus preserving the material and features underneath the resist.

Features such as the Constitution and the Lord's Prayer on the head of a pin may be realized using photolithography (select application of photoresist) and ion beam milling.


Argon ions within a plasma formed by an electrical discharge are accelerated by a pair of optically aligned grids. The highly collimated beam is focused on a tilted workplate that rotates during the milling operation. A neutralization filament prevents the buildup of positive charge on the workplate.

Material Etch Rate (A¡Æ/min)
Gold (Au) 1000
Copper (Cu) 700
Az-1350 (resist) 200
Nichrome (NiCr) 170
Alumina (Al2O3) 90

The challenge that Ion Beam Milling has addressed and solved is that of thicker metallizations encountered in the thin and thick film hybrid industry where metal thickness up to 10 microns (400uin) are required for low DCR or low frequency skin depth concerns.

Typical values of etch rates are:

Production Method: Dry Milling (4 to 5 um metallization)
Post-Process Yields: Exceeding 90 percent
Circuit-to-Circuit Repeatability: 100 percent
Milling Performance: Anisotropic with no undercutting or pattern change
Available Feature Size: 0.2 um (0.000008 in.)
Other Advantages: Reduced inspection, rework, and final test time due to excellent repeatability.

JSiTS Inc.

Tel)031-479-4211~2   Fax)031-479-4213

  www.JSiTS.com www.4pointprobe.com

E-mail; JSi@JSiTS.com