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<p>Sintered neodymium-iron-boron (NdFeB) magnets are indispensable in high-performance applications, but their optimization is challenged by complex structure-property relationships and limited data. In this work, we curate the first multi-domain database for this system (1994 industrial and academic samples) and systematically evaluate active learning (AL) strategies on classical and quantum-enhanced regressors. First, our “domain-aware” analysis reveals quantitative differences in design heuristics between industrial and academic data. Second, we present a methodological blueprint for integrating quantum kernel regression into an AL framework using a bootstrapped ensemble for uncertainty quantification. Finally, and most significantly, our results reveal AL effectiveness is strongly model-dependent. Its advantage ranges from significant acceleration (Random Forest, SVR) to being diminished (XGBoost), or even inverted—proving detrimental compared to random sampling—as shown in our quantum-enhanced SVR case study. This finding provides critical new insights for the strategic application of machine learning in materials discovery.</p>

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A framework of active data selection and quantum-enhanced regression for predicting magnetic properties of sintered NdFeB magnets

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月29日

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  • Lianhua He,
  • Qichao Liang,
  • Kaifan Pan,
  • Tianyan Li,
  • Qiang Ma,
  • Xin Wang,
  • Haibo Xu,
  • Yingjin Ma

摘要

Sintered neodymium-iron-boron (NdFeB) magnets are indispensable in high-performance applications, but their optimization is challenged by complex structure-property relationships and limited data. In this work, we curate the first multi-domain database for this system (1994 industrial and academic samples) and systematically evaluate active learning (AL) strategies on classical and quantum-enhanced regressors. First, our “domain-aware” analysis reveals quantitative differences in design heuristics between industrial and academic data. Second, we present a methodological blueprint for integrating quantum kernel regression into an AL framework using a bootstrapped ensemble for uncertainty quantification. Finally, and most significantly, our results reveal AL effectiveness is strongly model-dependent. Its advantage ranges from significant acceleration (Random Forest, SVR) to being diminished (XGBoost), or even inverted—proving detrimental compared to random sampling—as shown in our quantum-enhanced SVR case study. This finding provides critical new insights for the strategic application of machine learning in materials discovery.