Superconducting Materials and Magnetic Applications

Superconducting materials, characterised by zero electrical resistance and perfect diamagnetism below a critical temperature, have transformed the landscape of high-field magnet technology. The advent of high-temperature superconductors (HTS) has raised operating temperatures from near absolute zero to levels accessible with cryocoolers or liquid nitrogen, enabling more practical and compact devices. Key developments include the refinement of rare-earth barium copper oxide (REBCO) tapes and bulk superconductors, which combine high critical current density with strong flux pinning to trap and sustain intense magnetic fields. Applications span from fusion-grade stellarator and tokamak magnets, where enhanced field strength boosts plasma confinement, to medical imaging, magnetic levitation, rotating machinery and power transmission. Progress in materials formulation, large-scale wire production and mechanical design has tackled challenges such as Lorentz-force-induced stresses, screening‐current effects and joint resistance, paving the way for commercial deployment and next-generation scientific instruments.

Research from Nature Portfolio

Recent work has demonstrated a simple yet scalable YBa2Cu3O7 formulation doped with yttrium oxide nanoparticles, achieving exceptional engineering current density at high field. This advance enabled rapid delivery of kilometre-length HTS wires to a fusion customer, marking the largest industrial order to date. The uniform performance and cost reductions realised through this robust manufacturing route promise to lower barriers for fusion magnet construction and broaden HTS adoption in power and transport sectors.

Superconducting Materials and Magnetic Applications publication trend

The graph below shows the total number of articles in superconducting materials and magnetic applications across all publications each year (not limited to Nature Index journals).

Technical terms

High-temperature superconductor (HTS): material that exhibits superconductivity at temperatures above about 30 K, often cooled by liquid nitrogen or cryocoolers.

REBCO: rare-earth barium copper oxide family of HTS conductors noted for their high critical current density and performance in strong magnetic fields.

Critical current density: the maximum current per unit area a superconductor can carry without entering a resistive state.

Flux pinning: anchoring of magnetic vortices within defects or nanoparticle inclusions, preventing their motion and preserving zero resistance under applied fields.

Screening currents: induced currents in a superconductor that oppose changes in magnetic flux and can modify stress distributions within coils.

References

1. A promising approach to steady-state fusion: High-temperature superconducting strong-field stellarator with precise omnigenity. The Innovation (2023).
2. Review of progress and challenges of key mechanical issues in high-field superconducting magnets. National Science Review (2023).
3. Ultra-low electrical loss superconducting cables for railway transportation: Technical, economic, and environmental analysis. Journal of Cleaner Production (2024).
4. Development and large volume production of extremely high current density YBa2Cu3O7 superconducting wires for fusion. Scientific Reports (2021).
5. Bulk superconductors: a roadmap to applications. Superconductor Science and Technology (2018).
6. High power density superconducting rotating machines—development status and technology roadmap. Superconductor Science and Technology (2017).