We present a method of extracting the exchange parameters of the classical Heisenberg model from first-principles calculations of spin-spiral total energies based on density functional theory. The exchange parameters of the transition-metal monoxides MnO and NiO are calculated and used to estimate magnetic properties such as transition temperatures and magnon energies. Furthermore we show how to relate the magnon energies directly to differences in spin-spiral total energies for systems containing an arbitrary number of magnetic sublattices. This provides a comparison between magnon energies using a finite number of exchange parameters and the infinite limit.
Quality of the news is a difficult and complex concept to define. Who determines what is good quality and what is not? Quality depends in part on what → uses and gratifications are demanded from the media. Taking a liberal standpoint one could say that quality is what the audience wants. Another view would be to let media professionals, such as journalists and editors, act as moral agents and establish a set of criteria that defines good quality. The literature has, in sum, taken the view of professionals as the starting point.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.