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<p>We report a significant breakthrough in enhancing the performance of MgB₂ superconductors by engineering novel nanoscale defects using spark plasma sintering (SPS). By incorporating nanoscale MgB<sub>2</sub>O particles via silver addition, carbon doping, and magnesium excess, we introduce a transformative approach to defect design. This innovation yields exceptional material performance, characterized by a self-field critical current density (<i>J</i><sub><i>c</i></sub>) of 1.2 MA/cm<sup>2</sup> at 10&#xa0;K, a single peak in the normalized pinning force density diagram [<i>f(b) = F/F</i><sub><i>max</i></sub><i>(B/B</i><sub><i>irr</i></sub><i>)</i>] at <i>b</i> = 0.3, and the exceptional trapped field values of 4.21 T at 11&#xa0;K (for a 20&#xa0;mm diameter and 5.5&#xa0;mm thick single MgB<sub>2</sub> bulk), and 5 T at 15&#xa0;K and 6 T at 10&#xa0;K of a triple-stacked compact bulk MgB<sub>2</sub> cryo-magnet. These remarkable advancements highlight a novel paradigm in nanoscale defect engineering, with far-reaching implications for superconductors, nanomaterials, and advanced energy systems.</p>

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Nanostructured compact bulk MgB2 cryo-magnets with record-high critical currents and trapped magnetic fields

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月17日

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  • Muralidhar Miryala,
  • Tomoyuki Naito,
  • Milos Jirsa,
  • Jacques Noudem

摘要

We report a significant breakthrough in enhancing the performance of MgB₂ superconductors by engineering novel nanoscale defects using spark plasma sintering (SPS). By incorporating nanoscale MgB2O particles via silver addition, carbon doping, and magnesium excess, we introduce a transformative approach to defect design. This innovation yields exceptional material performance, characterized by a self-field critical current density (Jc) of 1.2 MA/cm2 at 10 K, a single peak in the normalized pinning force density diagram [f(b) = F/Fmax(B/Birr)] at b = 0.3, and the exceptional trapped field values of 4.21 T at 11 K (for a 20 mm diameter and 5.5 mm thick single MgB2 bulk), and 5 T at 15 K and 6 T at 10 K of a triple-stacked compact bulk MgB2 cryo-magnet. These remarkable advancements highlight a novel paradigm in nanoscale defect engineering, with far-reaching implications for superconductors, nanomaterials, and advanced energy systems.