Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Kienert, J."'
In this work we compare numerically exact Quantum Monte Carlo (QMC) calculations and Green function theory (GFT) calculations of thin ferromagnetic films including second order anisotropies. Thereby we concentrate on easy plane systems, i.e. systems
Externí odkaz:
http://arxiv.org/abs/0704.1552
Quantum mechanical calculations based on an extended Heisenberg model are compared with ferromagnetic resonance (FMR) experiments on prototype trilayer systems Ni_7/Cu_n/Co_2/Cu(001) in order to determine and separate for the first time quantitativel
Externí odkaz:
http://arxiv.org/abs/cond-mat/0612568
Temperature dependent FMR-measurements of Ni and Co films are analysed using a microscopic theory for ultrathin metallic systems. The mechanism governing the temperature dependence of the magnetic anisotropy energy is identified and discussed. It is
Externí odkaz:
http://arxiv.org/abs/cond-mat/0610649
Publikováno v:
Eur. Phys. J. B 53, 463-469 (2006)
We present a new type of temperature driven spin reorientation transition (SRT) in thin films. It can occur when the lattice and the shape anisotropy favor different easy directions of the magnetization. Due to different temperature dependencies of t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0610504
Autor:
Kienert, J., Nolting, W.
Publikováno v:
Phys. Rev. B 73, 224405 (2006)
The magnetic phase diagram of the ferromagnetic Kondo lattice model is determined at T=0 in 1D, 2D, and 3D for various magnitudes of the quantum mechanical localized spins ranging from S=1/2 to classical spins. We consider the ferromagnetic phase, th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606485
There are different mechanisms proposed to be responsible for the temperature dependence of the interlayer exchange coupling (IEC), namely a smearing out of the spacer or interface Fermi surface and excitations and interactions of spin waves. We prop
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503178
Publikováno v:
Phys. Ref. B 71, 024428 (2005).
We consider the spin reorientation transition in a ferromagnetic Heisenberg monolayer with a second order single ion anisotropy as a function of temperature and external field. Up to now analytical methods give satisfying results only for the special
Externí odkaz:
http://arxiv.org/abs/cond-mat/0411549
Publikováno v:
phys. stat. sol. (b) 236, 515 (2003)
We investigate the ferromagnetic Kondo-lattice model (FKLM) with a correlated conduction band. A moment conserving approach is proposed to determine the electronic self-energy. Mapping the interaction onto an effective Heisenberg model we calculate t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0306242
We develop an interpolating self-energy approach to the correlated Kondo-lattice model. The correlation of the band electrons is taken into account by a Hubbard interaction. The method is based on a self-energy ansatz, the structure of which allows t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0211629
Publikováno v:
In Journal of Magnetism and Magnetic Materials 2007 316(2):e86-e89
