Spin Ice Monopoles

spin ice
Physicists have made analogues of magnetic monopoles in spin ice. 

Competing interactions and a distinct crystal structure in spin ice produce excitations that behave like magnetic monopoles, hypothetical magnetic particles with only an isolated North or South pole. 

Related Abstract

Gray arrow  Monopole Dynamics in Spin Ice

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Reporters may freely use this image. Credit format: Image courtesy of Claudio Castelnovo (Royal Holloway University of London), Artistic representation by A.Canossa (2011).