利用Fe₈单分子磁体改进单分子磁体中粒子诱导磁雪崩的阈值
Improved Threshold for Particle-Induced Magnetic Avalanche in Single-Molecule Magnets Using Fe$_8$ Molecule
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中文总结 AI 辅助
该研究在Mn₁₂-ac单分子磁体磁雪崩探测器基础上，利用弛豫时间小一个数量级的Fe₈单分子磁体，研制出阈值至少低三个数量级的磁雪崩探测器，实验证实其可探测能量低两个数量级的γ粒子，后续将探索更低阈值。
中文摘要 AI 辅助
在基于Mn₁₂-ac单分子磁体（SMM）研发磁雪崩探测器的前期工作基础上，我们报道了利用Fe₈ SMM实现的阈值显著更低的磁雪崩探测器的研究结果。Fe₈的弛豫时间比Mn₁₂-ac小一个数量级，预计其雪崩阈值至少比Mn₁₂-ac低三个数量级。我们通过实验证实了这一点：探测到的γ粒子能量至少比原始Mn₁₂-ac探测器使用α粒子时的能量低两个数量级，该能量下限受限于实验可用的辐射源。磁雪崩的真实阈值可能显著更低，后续将利用更低能量的X射线及潜在的红外光子开展研究。
英文摘要
Extending the original work on the development of a magnetic avalanche detector using Mn$_{12}$-ac single-molecule magnet (SMM), we report the results on a significantly lower threshold magnetic avalanche detector using Fe$_8$ SMM. Fe$_8$ has an order of magnitude smaller relaxation time that is expected to produce at least 3 orders of magnitude lower avalanche threshold compared to Mn$_{12}$-ac. We confirm this experimentally through the detection of gamma particles with energy at least two orders of magnitude lower than the original Mn$_{12}$-ac detection demonstrated using alpha particles, limited by the experimentally available radiation source. The true threshold of avalanche may be significantly lower and will be explored with lower energy x-rays and potentially infrared photons.
发表机构
- Texas A&M University（德克萨斯农工大学）
- The University of Tokyo（东京大学）
- The Johns Hopkins University（约翰斯·霍普金斯大学）
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