Application of linear spin wave theory to the Cr8 antiferromagnetic Heisenberg Ring
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Date
2017-02-01
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Publisher
Australian Institute of Physics
Abstract
The investigation of single molecule magnets (SMMs) has proven to be a focal point of magnetism research for over three decades, leading to the discovery of structures which may find applications in data storage, quantum information processing (QIP) and spintronics. Though molecular magnetism is not a new field, there are still many complexes to investigate and understand, including a range of chains, rings, discs and cages. Amongst the considerable number of structures, particular interest has been shown to antiferromagnetic Heisenberg
rings (AFHR) such as Cr8, CsFe8 and Fe18. These structures have been investigated due to their interesting magnetic behaviours which include quantum tunnelling of the Neel vector (QTNV) and a long magnetic relaxation time below their blocking temperature TB [1]. The Cr8 homometallic AFHR is one of the most well understood structures of its type having been extensively investigated since its initial synthesis using techniques including high-field EPR, cantilever torque magnetometry [2] and INS [3]. Through application of Linear Spin Wave Theory (LSWT) using the SpinW Matlab library [4] it has been possible to calculate the
dynamic structure factor of the Cr8 ring; this agrees well with both the INS data collected for this structure as well as models produced using alternate methods [3]. This demonstrates that LSWT is applicable to the Cr8 ring and we plan to use this method to analyse more complex structures which also do not exhibit long range magnetic ordering.
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Keywords
Magnetism, Antiferromagnetism, Neel temperature, Spin, Heisenberg model, Magnetometers
Citation
D’Adam, T., Mole, R., & Stride, J. (2017). Application of linear spin wave theory to the Cr8 antiferromagnetic Heisenberg Ring. Poster presented to the 41st Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, Australia, 31st January - 3rd February 2017, (p.42). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2017/Wagga_2017_Conference_Handbook.pdf