Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets
Institute of Metal Physics, 620219 Ekaterinburg, Russia
2 Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden
Revised: 6 November 2002
Published online: 31 December 2002
Peculiarities of transport properties of three- and two-dimensional half-metallic ferromagnets are investigated, which are connected with the absence of spin-flip scattering processes. The temperature and magnetic field dependences of resistivity in various regimes are calculated. The resistivity is proportional to for and to for T* being the crossover temperature for longitudinal scattering processes. The latter scale plays also an important role in magnetoresistance. The contribution of non-quasiparticle (incoherent) states to the transport properties is discussed. It is shown that they can dominate in the temperature dependence of the impurity-induced resistivity and in the tunnel junction conductivity.
PACS: 72.10.Di – Scattering by phonons, magnons, and other nonlocalized excitations / 72.25.Ba – Spin polarized transport in metals / 75.50.Cc – Other ferromagnetic metals and alloys
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002