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
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.
Fund: 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).
Corresponding Authors:
Yang Sun
E-mail: youngsun@cqu.edu.cn
Cite this article:
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 2023 Chin. Phys. B 32 087505
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