IM4000II & ArBlade 5000

FAQs

• What is the Hitachi IM4000II and what does it do?

  The IM4000II is an ion milling system designed for high-quality SEM sample preparation. It uses a broad argon ion beam to create pristine cross-sections and polished surfaces without introducing mechanical stress or deformation to your samples. The system can perform both cross-section milling (to reveal internal structures) and flat milling (to polish surfaces for analysis).

• How does ion milling work?

  Ion milling is a physical sputtering process that uses accelerated argon ions to remove material from your sample surface atom by atom. Here's the step-by-step process:

  • Ion generation: The system ionizes argon gas to create positively charged argon ions
  • Acceleration: These ions are accelerated through an electric field at voltages between 0.5 to 6 kV (IM4000II) or up to 8 kV (ArBlade 5000)
  • Bombardment: The accelerated argon ions strike the sample surface with high kinetic energy
  • Material removal: The impact transfers enough energy to break atomic bonds and eject atoms from the sample surface—a process called sputtering
  • Controlled erosion: By directing the ion beam at specific angles and using masks, the system creates either polished surfaces (flat milling) or clean cross-sections

  The process can be compared to sandblasting at the atomic level, except instead of sand particles, you're using argon ions, and instead of removing visible chunks, you're removing individual atoms.

• How does argon ion milling differ from traditional sample preparation methods?

  Unlike mechanical polishing or cutting, ion milling is a contact-free physical method that eliminates mechanical stress. The process accelerates argon ions (from a few hundred volts to 6 kV) to bombard and sputter away material atom by atom. This prevents common artifacts like smearing, deformation, and debris filling that occur with mechanical methods.

• What types of materials can the IM4000II process?

  The IM4000II handles a wide range of materials including:

  • Metals and alloys
  • Polymers and composites
  • Electronic components and semiconductors
  • Battery materials (electrodes, separators)
  • Ceramics and hard materials
  • Biological samples
  • Pharmaceutical samples
  • Multi-layer films and coatings
• Which types of materials can’t be processed?

  Liquids and gels can’t be processed.

• What are the key operating parameters of the IM4000II?
  • Acceleration voltage: 0 to 6 kV (adjustable)
  • Maximum milling rate: 500 μm/h (for Si with 100 μm protrusion)
  • Maximum specimen size: 20(W) × 12(D) × 8(H) mm
  • Flat milling area: Up to φ32 mm
  • Tilt range: Adjustable from 0° to 90°
  • Rotation speed: 1 rpm, 25 rpm
• How long does sample preparation typically take?

  Processing time varies by material and desired outcome and can range from a few minutes to a few hours. For example:

  • Quick polish for soft materials: 5-10 minutes
  • Standard cross-section preparation: 30 minutes to 2 hours
  • Beam sensitive materials: 3-4 hours
  • Large area preparations: May require sequential processing
• What pre-preparation is needed before using the IM4000II?

  For cross-sectioning:

  • Samples should be relatively flat with parallel sides
  • Recommended thickness under 3 mm
  • Pre-cut or cleave close to the area of interest
  • Mount on a sample stub using adhesive or conductive tape

  For flat milling:

  • Embed samples in epoxy resin if needed
  • Pre-polish to 1 μm diamond particle finish
  • Ensure sample is less than 50 mm diameter and 25 mm height
• Can I process multiple samples at once?

  The standard IM4000II processes one sample at a time. However, you can mount multiple small samples on a single stub if they fit within the maximum specimen size of 20 × 12 × 8 mm. You can also use the ArBlade 5000 instead to process multiple samples.

• How does the IM4000II handle temperature-sensitive samples?

  The system offers three methods to prevent heat damage:

  1. Lower acceleration voltage: Reduce from 6 kV down to as low as 0.5 kV
  2. Intermittent milling (pulsing): Programmable ON/OFF cycles (1 second to 59 minutes)
  3. Cryogenic cooling (optional): Maintains temperatures from 0°C to -100°C using liquid nitrogen
• Which materials typically require special temperature management?
  • Polymers and soft plastics
  • Low-melting-point solders and alloys
  • Biological samples
  • Organic materials
• When should I choose the IM4000II over a FIB system?

  Choose the IM4000II when you need:

  • Larger cross-section areas (mm-scale vs. μm-scale)
  • Faster processing of large volumes
  • Lower equipment and operational costs
  • Minimal curtaining and redeposition artifacts

  Choose FIB when you need:

  • Site-specific preparation (targeting exact locations)
  • TEM lamella preparation
  • 3D reconstruction capabilities
• How does the IM4000II compare to mechanical polishing?

  Advantages over mechanical polishing include

  • No mechanical deformation or stress
  • No smearing of soft materials
  • Preserves true material interfaces in composites
  • No contamination from polishing compounds
  • Better for materials with different hardnesses
• What advantages does ion milling offer over ultramicrotomy?
  • No compression artifacts
  • Handles hard/soft material combinations better
  • No delamination in layered materials
  • Larger area preparation possible
  • No need for special knife maintenance
• How do I prevent curtaining effects in composite materials?

  Curtaining (vertical streaks) occurs when materials with different sputtering rates are present. Solution: Use the swing function (±15°, ±30°, or ±40°) to rock the sample during milling. This averages out the differential sputtering rates.

• What causes the "valley" shape in cross-sections?

  This V-shaped profile is normal and results from the ion beam gradually eroding into the material. Control the valley width by adjusting:

  • Acceleration voltage (higher voltage = narrower valley)
  • Swing angle (affects valley profile)
  • Processing time
• Can the IM4000II handle air-sensitive materials?

  Yes, with additional accessories. The system can be equipped with inert air-isolation transfer vessels and glove box connections for handling materials sensitive to oxygen or moisture. Contact us for specific air-sensitive workflow solutions.

• What consumables does the IM4000II need?
  • Argon gas (high purity, 99.99% or better)
  • Shielding masks (titanium or tungsten carbide)
  • Sample mounting supplies (stubs, adhesives, conductive tape)
  • Liquid nitrogen (if using cryogenic option)
• How often do masks need replacement?

  Mask lifetime depends on usage intensity and materials processed. Titanium masks typically last several tens of hours of operation. The optional tungsten carbide masks offer approximately 2x longer lifetime than standard masks.

• What level of expertise is needed to operate the IM4000II?

  The system features an intuitive touch-screen interface designed for ease of use. Basic operation can be learned in a few hours of training. Mastering advanced techniques for challenging materials typically takes a few weeks of regular use.