Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments

doi:10.1088/1674-1056/acd622

中国物理B ›› 2023, Vol. 32 ›› Issue (8): 87505-087505.doi: 10.1088/1674-1056/acd622

Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments

Dan Su(苏丹)^1,2, Yi-Quan Zhang(张义权)³, En-Ke Liu(刘恩克)^1,2, and Yang Sun(孙阳)^1,4,†

1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3. School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China;
4. Department of Applied Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China

收稿日期:2023-03-24 修回日期:2023-05-06 接受日期:2023-05-17 发布日期:2023-07-24
通讯作者: Yang Sun E-mail:youngsun@cqu.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No.2021YFA1400303) and the National Natural Science Foundation of China (Grant No.12227806).

Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments

Dan Su(苏丹)^1,2, Yi-Quan Zhang(张义权)³, En-Ke Liu(刘恩克)^1,2, and Yang Sun(孙阳)^1,4,†

1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3. School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China;
4. Department of Applied Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China

Received:2023-03-24 Revised:2023-05-06 Accepted:2023-05-17 Published:2023-07-24
Contact: Yang Sun E-mail:youngsun@cqu.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No.2021YFA1400303) and the National Natural Science Foundation of China (Grant No.12227806).

摘要/Abstract

摘要： We report the synthesis and characterization of a single-molecule magnet composed of triangular clusters of dysprosium ions. The structural study shows that the symmetry changes from one polar point group (mm2) at room temperature to another polar point group (m) at low temperature. Magnetic studies and theory calculations illustrate that the vortex distribution of magnetic dipoles in the triangular dysprosium clusters forms a toroidal magnetic moment. Interestingly, the analysis of AC magnetic susceptibility reveals the coexistence of three distinct magnetic relaxation processes, corresponding to the Raman, Orbach, and QTM relaxation pathways, respectively. The sum of three modified Debye functions is successfully used to describe the multiple relaxation behavior.

关键词: single-molecule magnet, magnetic relaxation, toroidal moment

Abstract: We report the synthesis and characterization of a single-molecule magnet composed of triangular clusters of dysprosium ions. The structural study shows that the symmetry changes from one polar point group (mm2) at room temperature to another polar point group (m) at low temperature. Magnetic studies and theory calculations illustrate that the vortex distribution of magnetic dipoles in the triangular dysprosium clusters forms a toroidal magnetic moment. Interestingly, the analysis of AC magnetic susceptibility reveals the coexistence of three distinct magnetic relaxation processes, corresponding to the Raman, Orbach, and QTM relaxation pathways, respectively. The sum of three modified Debye functions is successfully used to describe the multiple relaxation behavior.

Key words: single-molecule magnet, magnetic relaxation, toroidal moment

中图分类号: (Dynamic properties?)

75.40.Gb

75.50.-y (Studies of specific magnetic materials)

Dan Su(苏丹), Yi-Quan Zhang(张义权), En-Ke Liu(刘恩克), and Yang Sun(孙阳). Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments[J]. 中国物理B, 2023, 32(8): 87505-087505.

Dan Su(苏丹), Yi-Quan Zhang(张义权), En-Ke Liu(刘恩克), and Yang Sun(孙阳). Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments[J]. Chin. Phys. B, 2023, 32(8): 87505-087505.

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Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments

Unusual magnetic relaxation in a single-molecule magnet with toroidal magnetic moments

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