Plasma Focused Ion Beam (P-FIB): How It Works & Applications

What Is Plasma Focused Ion Beam (PFIB)?

Plasma Focused Ion Beam (PFIB) is an advanced analytical and nanofabrication instrument that uses a high-brightness plasma ion source — rather than the conventional gallium liquid metal ion source (LMIS) used in traditional FIB systems — to generate and focus a beam of xenon (Xe⁺), argon (Ar⁺), or oxygen (O⁺) ions for high-rate material removal, cross-sectioning, and TEM sample preparation. PFIB enables sample preparation and imaging at 10–50× faster material removal rates than conventional Ga-FIB — making it transformative for large-area cross-section analysis, multi-site sampling, and industrial-scale materials characterisation.

How PFIB Differs from Conventional Ga-FIB

Ion Source

Conventional FIB uses a gallium liquid metal ion source (LMIS) with a focused beam current of 0.1–65 nA. PFIB uses an inductively coupled plasma (ICP) source with beam currents of 0.1–2,500 nA — providing 10–100× higher current at matched focus conditions. This dramatic current increase enables material removal rates of 5–50 µm³/s (PFIB Xe) vs. 0.5–5 µm³/s (Ga-FIB).

Gallium Implantation Elimination

Ga-FIB implants gallium ions into the milled surface — introducing a 20–30 nm damaged and gallium-contaminated layer that can alter electrical, mechanical, and chemical properties of the specimen surface. PFIB with xenon ions avoids gallium contamination entirely — essential for gallium-sensitive analyses (EDS detection of Ga, electrical measurements of Ga-contaminated regions) and for biological or soft materials where gallium toxicity is a concern.

Reduced Sample Damage

Xenon ions are heavier than gallium (131 vs. 70 amu) but have lower penetration depth at equivalent energy — producing less sub-surface damage and a thinner amorphised surface layer in silicon and compound semiconductors. Combined with low-kV polishing steps, PFIB produces near-damage-free TEM lamella surfaces for atomic-resolution imaging.

Key PFIB Applications

Large-Area Cross-Section Analysis

The most transformative PFIB application. Traditional Ga-FIB cross-section trenches are typically 20–50 µm wide × 15–30 µm deep (limited by milling time). PFIB produces cross-sections of 200–500 µm width × 100 µm depth in the same time, enabling statistically representative microstructure characterisation across large material volumes.

Large-area PFIB cross-sections reveal: grain size distributions in additive-manufactured metals (where large area sampling is needed for statistical validity), coating thickness uniformity over large areas, multi-layer semiconductor stack integrity at multiple die positions simultaneously, and failure zone extent in automotive crash components.

High-Throughput TEM Sample Preparation

PFIB prepares TEM lamellae at 5–10× the throughput of Ga-FIB — enabling preparation of 20–50 TEM lamellae per day compared to 4–8 per day with Ga-FIB. This throughput advantage enables statistically meaningful TEM datasets from multiple positions — critical for semiconductor process variation studies, failure analysis of multiple failing sites, and battery materials degradation mapping.

3D Tomography (Slice-and-View)

Sequential PFIB cross-sectioning combined with SEM imaging at each slice builds a complete 3D reconstruction of the microstructure — PFIB 3D tomography volumes of 100 × 100 × 100 µm³ (equivalent to 10⁶ µm³) are achievable in practical timeframes, providing statistically representative 3D grain structure, pore network, and second phase distribution data.

Semiconductor Failure Analysis

PFIB is used for wafer-level failure analysis of multiple dies across a wafer lot — preparing cross-sections at precisely targeted coordinates across 300 mm wafers with 100 nm positioning accuracy. The high current enables rapid removal of thick metal layers and dielectric stacks in advanced 3D NAND memory and logic devices with hundreds of patterned layers.

Industrial Applications

In the semiconductor industry, PFIB is the preferred tool for process development and failure analysis at technology nodes below 5 nm, where large-area cross-section statistics are needed. In additive manufacturing, PFIB characterises porosity distribution, lack-of-fusion defects, and microstructure variability in laser powder bed fusion components. In battery research, PFIB cross-sections through entire electrode stacks reveal lithium plating morphology and SEI distribution at the cycled anode.

Conclusion

Plasma Focused Ion Beam (PFIB) represents a major advancement over conventional FIB technology by enabling high-speed, large-area material removal and precise nanoscale sample preparation without gallium contamination. Its ability to deliver significantly higher ion beam currents allows researchers and engineers to analyse larger volumes, prepare multiple samples efficiently, and obtain statistically meaningful data — capabilities that are increasingly critical in modern materials science. PFIB has become an essential tool in semiconductor failure analysis, additive manufacturing characterisation, battery research, and advanced materials development, where both scale and precision are required.

Why Choose Infinita Lab for PFIB Analysis?

With Infinita Lab (www.infinitalab.com), you are guaranteed a Nationwide Network of Accredited Laboratories spread across the USA, the best Consultants from around the world, Convenient Sample Pick-Up and Delivery, and Fast Turnaround Time. 

Our team understands the stakes and subtleties of every test. Whether you’re validating a new Product, de-risking a prototype, or navigating complex compliance requirements, our specialists guide the process with rigour and clarity.  

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090  to learn more about our services and how we can support you. Request a Quote

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