Magnetic excitations in La1.5Sr0.5CoO4

Magnetic Excitations in Thulium

We have observed, for the first time, magnetic excitations in a single crystal of thulium, using inelastic neutron spectroscopy. In the ferrimagnetic phase three modes with energies around 4 meV, 8 meV and 15 meV were clearly seen. We have considered our results in terms of crystal field level schemes for thulium. The rare earth metal thulium (hcp, electronic configuration 4f12) exhibits a part...

Magnetic Triplet Excitations in Graphene

When doping graphene an unique window appears in the electron–hole excitation spectrum. Including the Coulomb interaction through the Hubbard Hamiltonian results in bound state formation in graphene. The bound states we analyze represent triplet excitations, i.e. magnons, with spin 1. When increasing the strength of the Coulomb interaction, electron–hole pairs are dragged down into the window. ...

Uniform excitations in magnetic nanoparticles

We present a short review of the magnetic excitations in nanoparticles below the superparamagnetic blocking temperature. In this temperature regime, the magnetic dynamics in nanoparticles is dominated by uniform excitations, and this leads to a linear temperature dependence of the magnetization and the magnetic hyperfine field, in contrast to the Bloch T(3/2) law in bulk materials. The temperat...

Magnetic excitations in a nanocontact

The domain wall in a ferromagnetic nanocontact adopts a specific configuration—Néel-like, vortex, or Bloch-like—depending on the dipole-dipole interactions governed by the size and shape of the contact and its atomic structure. Spontaneous thermal fluctuations between these modes arise in a soft ferromagnet at room temperature when the dimensions of the contact are less than about 10 nm. The gi...

Uniform magnetic excitations in nanoparticles