Zobrazeno 1 - 10
of 769
pro vyhledávání: '"Nolting, W."'
In this work we revise the theory of one electron in a ferromagnetically saturated local moment system interacting via a Kondo-like exchange interaction. The complete eigenstates for the finite lattice are derived. It is then shown, that parts of the
Externí odkaz:
http://arxiv.org/abs/1207.5623
Autor:
Stier, M., Nolting, W.
We investigate the influence of the carrier density and other parameters on the interlayer exchange in magnetic thin film systems. The system consists of ferromagnetic and non-magnetic layers where the carriers are allowed to move from layer to layer
Externí odkaz:
http://arxiv.org/abs/1109.0830
Publikováno v:
J. Phys.: Condens. Matter 23 (2011) 276006
We investigate the existence of several (anti-)ferromagnetic phases in the diluted ferromagnetic Kondo-lattice model, i.e. ferromagnetic coupling of local moment and electron spin. To do this we use a coherent potential approximation (CPA) with a dyn
Externí odkaz:
http://arxiv.org/abs/1106.0181
Autor:
Stier, M., Nolting, W.
We present a theory to model carrier mediated ferromagnetism in concentrated or diluted local moment systems. The electronic subsystem of the Kondo lattice model is described by a combined equation of motion / coherent potential approximation method.
Externí odkaz:
http://arxiv.org/abs/1104.4222
The Hubbard model has been employed successfully to understand many aspects of correlation driven physical properties, in particular, the magnetic order in itenerant electron systems. In some systems such as Heusler alloys, manganites etc., it is kno
Externí odkaz:
http://arxiv.org/abs/1002.3718
Autor:
Sharma, A., Nolting, W.
Publikováno v:
Phys. Rev. B 81, 125303 (2010)
The mechanism behind ferromagnetic exchange interaction in GdN is not well understood. It has been argued that it can be due to fourth order cross process of \textit{d-f} mixing and \textit{d-f} exchange. An alternative explanation suggests an anti-
Externí odkaz:
http://arxiv.org/abs/1002.1426
Autor:
Schwabe, A., Nolting, W.
Publikováno v:
Phys. Rev. B 80, 214408 (2009)
We present an new approach for the ferromagnetic, three-dimensional, translational-symmetric Kondo lattice model which allows us to derive both magnon energies and linewidths (lifetimes) and to study the properties of the ferromagnetic phase at finit
Externí odkaz:
http://arxiv.org/abs/0910.5478
Autor:
Sandschneider, N., Nolting, W.
We study the behaviour of the magnetization in a half-metallic ferromagnet/nonmagnetic insulator/ferromagnetic metal/paramagnetic metal (FM1/NI/FM2/PM) tunnel junction. It is calculated self-consistently within the nonequilibrium Keldysh formalism. T
Externí odkaz:
http://arxiv.org/abs/0904.4821
Autor:
Henning, S., Nolting, W.
The magnetic ground state phase diagram of the ferromagnetic Kondo-lattice model is constructed by calculating internal energies of all possible bipartite magnetic configurations of the simple cubic lattice explicitly. This is done in one dimension (
Externí odkaz:
http://arxiv.org/abs/0901.2855
Autor:
Stier, M., Nolting, W.
We use an extended two-band Kondo lattice model (KLM) to investigate the occurrence of different (anti-)ferromagnetic phases or phase separation depending on several model parameters. With regard to CMR-materials like the manganites we have added a J
Externí odkaz:
http://arxiv.org/abs/0810.1672