Results 1 - 10 of 1865
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[en] Forbidden magnon scattering from Gd was investigated using polarized neutrons. In contrast to earlier results for itinerant electron ferromagnets, forbidden magnons were not observed for this Heisenberg ferromagnet. This suggests that magnetic short range order is more important in the thermally-induced spin-disordering of the itinerant electron systems
Nanomagnonics [This Viewpoint relates to an article by V V Kruglyak, S O Demokritov and D Grundler (2010 J. Phys. D: Appl. Phys. 43 264001) and was published as part of a series of Viewpoints celebrating 50 of the most influential papers published in the Journal of Physics series, which is celebrating its 50th anniversary]
[en] Highlights: • Novel edge states in a ferromagnetic honeycomb lattice with armchair boundaries are obtained. • The missing bonds along the boundary sites make the edge itself a defect and Tamm-like edge states are thus induced. • The Tamm-like edge states are strongly sensitive to external on-site potentials. • The external on-site potential can also be used to tune the topologically protected edge states. - Abstract: We investigate the properties of magnon edge states in a ferromagnetic honeycomb lattice with armchair boundaries. In contrast with fermionic graphene, we find novel edge states due to the missing bonds along the boundary sites. After introducing an external on-site potential at the outermost sites we find that the energy spectra of the edge states are tunable. Additionally, when a non-trivial gap is induced, we find that some of the edge states are topologically protected and also tunable. Our results may explain the origin of the novel edge states recently observed in photonic lattices. We also discuss the behavior of these edge states for further experimental confirmations.
[en] Magnonics is a young field of research and technology emerging at the interfaces between the study of spin dynamics, on the one hand, and a number of other fields of nanoscale science and technology, on the other. We review the foundations and recent achievements in magnonics in view of guiding further progress from studying fundamental magnonic phenomena towards applications. We discuss the major challenges that have to be addressed in future research in order to make magnonics a pervasive technology.
[en] We present a study of one-dimensional magnetic system using field theory methods. We studied the discreteness effects in a classical anisotropic one dimensional antiferromagnet in an external magnetic field. It is shown that for TMMC, at the temperatures and magnetic fields where most experiments have been done, the corrections are small and can be neglected. (author)
[en] There have been numerous studies of entanglement in spin systems. These have usually focused on examining the entanglement between individual spins or determining whether the state of the system is completely separable. Here, we present conditions that allow us to determine whether blocks of spins are entangled. We show that sometimes these conditions can detect entanglement better than conditions involving individual spins. We apply these conditions to study entanglement in spin-wave states, both when there are only a few magnons present and also at finite temperature.