PI demonstrates six-axis MagLev stages for semiconductor tools

By Amara Osei

PI (Physik Instrumente) introduced 6-axis magnetic-levitation demonstrators at SEMICON West 2026, including a long-travel linear stage with 400 mm of primary-axis travel and an atomic-force-microscopy scanner with 50-picometer X/Y positioning resolution.

PI presented three demonstrator families at the event: linear, rotary and atomic force microscopy (AFM) platforms for bonding, wafer inspection and surface metrology.

What did PI demonstrate at SEMICON West 2026?

PI’s announcement says the platforms combine “contact-free positioning with active control of all six degrees of freedom,” removing mechanical bearing contact, lubrication and bearing wear. PI presents the packages as sources of nanometer stability and in-process error correction. These are vendor statements; the announcement provides no independent measurements, test conditions or uncertainty figures.

PI’s target processes are advanced packaging and hybrid bonding, wafer inspection and high-resolution surface metrology. The company also lists optics and photonics among the industries served.

Takeaway: One levitated platform handles position and alignment that could require several stacked stages.

What can the 400-mm linear stage do?

The long-travel linear MagLev stage provides 400 mm of travel on its primary axis and five auxiliary axes. Active control across all six degrees of freedom supports precise positioning as well as force-controlled bonding.

The published travel and motion figures are:

• 400 µm of auxiliary motion in Y and Z.
• 1 mrad of angular motion in θX and θY, and 2 mrad in θZ.
• Force-controlled bonding at forces exceeding 100 N.
• Configurations supporting acceleration up to 6 g.

Takeaway: The linear unit covers long travel, small-angle motion and high-force bonding in one package.

What does the rotary platform add?

The rotary MagLev platform, built around five auxiliary axes, combines continuous rotation with active control of the remaining degrees of freedom, including height and tip/tilt. During wafer inspection and metrology, the system actively maintains position and alignment while the primary axis rotates.

Rotation can disturb alignment, so the stated purpose is to correct that disturbance within the same platform. PI does not quote residual alignment error, correction bandwidth or performance under a stated inspection load.

Takeaway: Rotation no longer has to surrender alignment control.

What does the AFM scanner resolve?

Designed for atomic force microscopy and other high-resolution surface measurements, the MagLev AFM XY scanner includes four auxiliary axes. It provides vendor-stated X/Y positioning resolution of 50 picometers across scan ranges up to 50 mm.

A quoted positioning resolution does not by itself establish absolute metrological accuracy. Buyers should not treat the two as synonyms, and PI’s announcement supplies neither repeatability nor uncertainty data.

No load case, noise floor or calibration interval accompanies the resolution figure. The number is precise; the acceptance envelope is not.

Takeaway: The scanner offers very fine positioning, but buyers still need accuracy and repeatability data.

Why replace mechanical bearings?

Magnetic levitation replaces a mechanical bearing with controlled magnetic forces that support and move the stage without contact. Active six-axis control then corrects position and alignment errors electronically within one platform, reducing the need for multiple mechanical positioning stages.

That architecture also removes friction, lubrication, wear and bearing-related particle generation. In semiconductor processing, where cleanliness, positioning accuracy and throughput carry weight, those are not decorative specifications.

The announcement does not identify the sensing arrangement, control bandwidth or residual alignment error during a rotating inspection. Absence of numbers is common at demonstrator stage; absence of questions would be less sensible.

Takeaway: Levitation removes bearing wear while electronic control reduces stage stacking.

What did the poster award cover?

PI’s MagLev and active wafer chuck work received the best poster award at the SEMICON West Test Vision Poster Session. The winning poster carried the title “MagLev Platforms and Active Wafer Chuck Technology for Advanced Semiconductor Manufacturing.”

The work addresses next-generation hybrid bonding, inspection and metrology applications, where the source says cleanliness, positioning accuracy and throughput are increasingly important.

The recognition applies to the poster, not an independently validated production system. PI gives no active-wafer-chuck specifications or qualification data.

Takeaway: The award recognizes the concept, not production validation.

When should a process tool adopt these stages?

PI names semiconductor manufacturing, advanced packaging and hybrid bonding, wafer inspection, high-resolution surface metrology, optics and photonics among the applications and industries served.

Before adoption, an equipment maker should ask whether position, alignment and force performance hold in the complete tool under production loads, thermal cycles and cleanliness limits. The source provides no test conditions, calibration interval, uncertainty budget, repeatability results or named test standard. That omission is normal for a demonstration; treating the specification as production evidence would not be.

The development therefore leaves one adoption question: will PI validate the six-axis performance, force capability and particle cleanliness in the intended tool against a stated acceptance standard, and on what calibration interval?