J Bünemann 2001 J. Phys.: Condens. Matter 13 5327 doi:10.1088/0953-8984/13/22/324
J Bünemann
Show affiliationsWe introduce a novel approach for the investigation of spin-wave excitations in itinerant ferromagnets. Our theory is based on a variational treatment of general multi-band Hubbard models which describe elements and compounds of transition metals. The magnon dispersion is derived approximately as the energy of a variational spin-wave state in the limit of large spatial dimensions. A numerical evaluation of our results is feasible for general multi-band models. As a first application we consider a model with two degenerate orbitals per lattice site. From our results we can conclude that spin-wave excitations in strong itinerant ferromagnets are very similar to those in ferromagnetic spin systems.
Issue 22 (4 June 2001)
Received 22 May 2000, in final form 14 March 2001
J Bünemann 2001 J. Phys.: Condens. Matter 13 5327
Ghi R Shin and Berndt Müller 2003 J. Phys. G: Nucl. Part. Phys. 29 2485
Takaaki Tanaka et al. 2008 ApJ 685 988
J. Kane et al. 2000 ApJ 528 989
Prahalad M Parthangal et al 2006 Nanotechnology 17 3786
Kausik S Das et al 2009 Nonlinearity 22 2981
S. Sahayanathan and R. Misra 2005 ApJ 628 611
E H Hirsch 1959 J. Sci. Instrum. 36 477
J Lévêque et al 2009 Supercond. Sci. Technol. 22 125021
Y.-N. Su et al 2004 ApJ 616 L39