Grain boundaries in granular materials-A fundamental limit for thermal stability
Saharan, L; Morrison, C; Ikeda, Y; et al.Takano, K; Miles, JJ; Thomson, T; Schrefl, T; Hrkac, G
Date: 8 April 2013
Article
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Publisher DOI
Abstract
We show that thermal-stability and the associated switching field in well segregated, nanoscale granular materials is explained by grain boundary and interface effects. Grain boundaries pose a fundamental limit on scaling rooted in their chemical and morphological structure, while exchange interactions across interfaces cause the ...
We show that thermal-stability and the associated switching field in well segregated, nanoscale granular materials is explained by grain boundary and interface effects. Grain boundaries pose a fundamental limit on scaling rooted in their chemical and morphological structure, while exchange interactions across interfaces cause the switching to deviate from the expected coherent Stoner-Wohlfarth behaviour. Measurements and simulations of CoCrPt-systems show a clear shift in applied field angle behaviour, arising from exchange-coupling between magnetic-phases, while the quantitative switching field can only be explained by a transition layer surrounding the grains. These results are potentially significant for Heat-Assisted-Magnetic Recording and Bit-Patterned-Media Recording. © 2013 AIP Publishing LLC.
Engineering
Faculty of Environment, Science and Economy
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