title: Uniform excitations in magnetic nanoparticles.
abstract: 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 temperature dependence of the average magnetization is conveniently studied by Mössbauer spectroscopy. The energy of the uniform excitations of magnetic nanoparticles can be studied by inelastic neutron scattering.
authors: Department of Physics, Building 307, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors: Steen
authors: S
authors: Mørup
authors: Cathrine
authors: C
authors: Frandsen
authors: Mikkel Fougt
authors: MF
authors: Hansen