Dirac strings and magnetic monopoles in spin ices
|Date and time||
Apr 25, 2012
from 12:10 PM to 01:30 PM
|Location||60 St. George Street, MP 1115|
University of Winnipeg/University of Manitoba
In the world of condensed matter physics, there has been a flurry of activity centered on the existence of “magnetic monopoles” in a strange group of materials known as “spin ices.” While the idea of a magnetic monopole has been around for quite some time (using magnetic “charge” as a computational tool since the time of Faraday), the theoretical grounding for magnetic monopoles was not made clear until the work of Paul Dirac. In this talk, I will outline the historical development of the idea of a “magnetic monopole," and then discuss how monopoles (and Dirac strings) manifest themselves in spin ices. Recent work on new spin ices, in which
there is a high density of monopoles, will be mentioned, and the application of an idea in physical chemistry (the Debye-Hückel equation) will be shown to be an excellent approximation to describing monopoles as an magnetic “electrolyte” solution.
(1) H. D. Zhou et al, Nature Communications, 2011.
|Contact Name||Helen Iyer|