Abstract
The rate of thermal transitions in a kagome spin ice element is calculated using harmonic transition state theory for magnetic systems. Each element consists of six prolate magnetic islands. Minimum energy paths on the multidimensional energy surface are found to estimate activation energy. Vibrational frequencies are also calculated to estimate the rate of the various transitions. An overall transition rate between equivalent ground states is calculated by using the stationary state approximation including all possible transition paths. The resulting transition rate is in a good agreement with experimentally measured lifetime.
Highlights
Artificial spin ice is a frustrated system of magnets with ground state entropy
We focus here on a single kagome ring formed by six islands and study how the interaction between them affects the activation energy and mechanism of the transitions
The in-plane shape anisotropy parameter Kin and out of plane shape anisotropy parameter Kout were calculated by using micro-magnetic simulation from the volume and saturation magnetization
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 741 012182 (http://iopscience.iop.org/1742-6596/741/1/012182) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 130.233.216.137 This content was downloaded on 30/03/2017 at 11:09 Please note that terms and conditions apply. A silence black hole: Hawking radiation at the Hagedorn temperature O. S Y Liashko, V M Uzdin, H Jónsson1,4 1Faculty of Physical Sciences, VR-III, University of Iceland, Reykjavik, Iceland 2Department of Natural Sciences, University ITMO, St. Petersburg, 197101 Russia 3Department of Physics, St. Petersburg State University, St. Petersburg, 198504 Russia 4Department of Applied Physics, Aalto University, FIN-00076 Espoo, Finland
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