Superconducting magnet

Overview

The Low Temperatures and High Magnetic Field Optical Research Platform is an integrated cryogenic system providing 1.7–350 K temperature control, a vertical conical split‑coil superconducting magnet up to ±7 T, and multi-directional optical access. It is designed for combined optical, spectroscopic and electrical measurements with a large, low‑vibration sample space.

Main capabilities

• Large sample space that supports multiple measurement geometries and in-situ positioning.
• Integration options including a multi-axis cryogenic piezoelectric stage and in-situ electrical test leads.
• Support for optical and spectroscopic techniques: low-temperature MOKE, TR-MOKE, low-temperature Raman, low-temperature photoluminescence, ultrafast laser pumping and terahertz time-domain spectroscopy.
• Multi-directional optical access: seven side optical windows, one top window and an additional bottom window for flexible beam angles.
• Electrical and RF connectivity: DC lines, high-frequency lines and expandable cable support for complex experiments.

Technical specifications

• Temperature range: 1.7 K to 350 K.
• Temperature stability: ±0.2% for T < 20 K; ±0.02% for T ≥ 20 K.
• Magnet type: Conical split-coil superconducting magnet (vertical field).
• Magnetic field strength: ±7 T.
• Magnetic field uniformity region: ±0.3% over a 3 cm spherical region.
• Field sweep rate: 0–7 T in ≤ 30 minutes.
• Sample stage vibration: ±20 nm.
• Sample space: 89 mm diameter, 88 mm height.
• Top optical window: 1 × 50 mm diameter, 44 mm clear aperture.
• Side optical windows: 7 × 40 mm diameter, 26 mm clear aperture.
• Top window angular options: 70° full range (sample at magnet center); 90° full range (sample 13 mm above center); standard top window-to-sample distance: 15 mm.
• Side window optical path angle: 13° full range (sample at magnet center).
• Electrical channels — DC: 16 DC lines.
• Electrical channels — High-frequency: 4 × 20 GHz lines.
• Expansion channel: supports up to 80 cables.

Applications

• Low-temperature magneto-optical studies (MOKE, TR-MOKE) and spintronic characterization.
• Low-temperature Raman and photoluminescence spectroscopy of quantum and correlated materials.
• Ultrafast pump–probe experiments and terahertz time-domain spectroscopy under high magnetic field.
• Superconductivity, quantum materials and transport measurements with optical access.

Options & integration

• Customizable sample stages, multi-axis piezo stages and in-situ electrical feedthroughs.
• Expandable cable harnesses and RF routing for combined optical and microwave experiments.
• Optional window configurations and optical access angles for specific measurement geometries.