π-anisotropy: A nanocarbon route to hard magnetism

High coercivity magnets are an important resource for renewable energy, electric vehicles, and memory technologies. Most hard magnetic materials incorporate rare earths such as neodymium and samarium, but concerns about the environmental impact and supply stability of these materials are prompting research into alternatives. Here, we present a hybrid bilayer of cobalt and the nanocarbon molecule C60 which exhibits significantly enhanced coercivity with minimal reduction in magnetization. We demonstrate how this anisotropy enhancing effect cannot be described by existing models of molecule-metal magnetic interfaces. We outline a form of anisotropy, arising from asymmetric magnetoelectric coupling in the metal-molecule interface. Because this phenomenon arises from π−d hybrid orbitals, we propose calling this effect π-anisotropy. While the critical temperature of this effect is currently limited by the rotational degree of freedom of the chosen molecule, C60, we describe how surface functionalization would allow for the design of room-temperature, carbon-based hard magnetic films

'Theories are made only to die in the war of time': Guy Debord and the Situationist International as strategic thinkers

The Situationist International (SI) has been one of the main reference points during the past 40 or more years within social movement organizing, cultural studies, social theory and philosophy. While the SI has been understood in many ways as inheritors and elaborators of an unorthodox Marxist politics drawing heavily from the history of the avant-garde, relatively little attention has been paid to the specifically strategic dimension of their thought and practice. This is surprising, especially in Debord's case, given how much his work also draws from the history of military strategy. This paper will particularly examine the strategic aspects of Debord and the SI's thought and politics and how they rethink the nature of strategy through collective forms of aesthetic-political practice. © 2013 Taylor & Francis