中国物理B ›› 2025, Vol. 34 ›› Issue (12): 127501-127501.doi: 10.1088/1674-1056/ade858

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Resonance-assisted drastic transition in single-molecule magnets

Lei Gu(古磊)1,†, Jia Luo(罗佳)1, Ruqian Wu2, and Guoping Zhao(赵国平)1,3,‡   

  1. 1 College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China;
    2 Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;
    3 Center for Magnetism and Spintronics, Sichuan Normal University, Chengdu 610068, China
  • 收稿日期:2025-05-06 修回日期:2025-06-23 接受日期:2025-06-26 发布日期:2025-12-09
  • 通讯作者: Lei Gu, Guoping Zhao E-mail:gulei@sicnu.edu.cn;zhaogp@uestc.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12404085, 12474122, 52171188, 51771127, and 52111530143), the Fund from DOE-BES (Grant No. DE-FG02-05ER46237), and the Central Government Funds of Guiding Local Scientific and Technological Development for Sichuan Province, China (Grant No. 2021ZYD0025).

Resonance-assisted drastic transition in single-molecule magnets

Lei Gu(古磊)1,†, Jia Luo(罗佳)1, Ruqian Wu2, and Guoping Zhao(赵国平)1,3,‡   

  1. 1 College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China;
    2 Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;
    3 Center for Magnetism and Spintronics, Sichuan Normal University, Chengdu 610068, China
  • Received:2025-05-06 Revised:2025-06-23 Accepted:2025-06-26 Published:2025-12-09
  • Contact: Lei Gu, Guoping Zhao E-mail:gulei@sicnu.edu.cn;zhaogp@uestc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12404085, 12474122, 52171188, 51771127, and 52111530143), the Fund from DOE-BES (Grant No. DE-FG02-05ER46237), and the Central Government Funds of Guiding Local Scientific and Technological Development for Sichuan Province, China (Grant No. 2021ZYD0025).

摘要: Using exact diagonalization of the Hamiltonian and transition matrix in the energy eigenbasis, we perform model calculations of the magnetic relaxation rate in single-molecule magnets. A careful examination of the transition matrix reveals that resonant tunneling does not enhance transitions between the nearly degenerate states; rather, it suppresses them. Instead, transitions from one state in the degenerate pair to neighboring states of the other are significantly enhanced. We conduct a detailed analysis of the transition rates to clearly demonstrate how resonant tunneling modulates these processes. This work provides a substantial reinterpretation of the resonant magnetic relaxation in single-molecule magnets and clearly identifies the dominant relaxation pathways.

关键词: single-molecule magnets, resonant tunneling, resonant magnetic relaxation

Abstract: Using exact diagonalization of the Hamiltonian and transition matrix in the energy eigenbasis, we perform model calculations of the magnetic relaxation rate in single-molecule magnets. A careful examination of the transition matrix reveals that resonant tunneling does not enhance transitions between the nearly degenerate states; rather, it suppresses them. Instead, transitions from one state in the degenerate pair to neighboring states of the other are significantly enhanced. We conduct a detailed analysis of the transition rates to clearly demonstrate how resonant tunneling modulates these processes. This work provides a substantial reinterpretation of the resonant magnetic relaxation in single-molecule magnets and clearly identifies the dominant relaxation pathways.

Key words: single-molecule magnets, resonant tunneling, resonant magnetic relaxation

中图分类号:  (Molecular magnets)

  • 75.50.Xx
76.30.-v (Electron paramagnetic resonance and relaxation) 76.60.Es (Relaxation effects)