- Comparisons
- G. Albuquerque, J. Miltat and A. Thiaville
- R. D. McMichael, M. J. Donahue, D. G. Porter, and J. Eicke
- Liliana Buda, Lucian Prejbeanu, Ursula Ebels and Kamel Ounadjela
- E. Martinez, L. Torres and L. Lopez-Diaz
- José L. Martins and Tania Rocha
- P.E. Roy and P. Svedlindh
- Massimiliano d’Aquino, Claudio Serpico, and Giovanni Miano
- Dmitri Berkov
- M. J. Donahue and D. G. Porter

- Date:
- November 18, 2005.
- From:
- Pierre E. Roy and Peter Svedlindh
*Department of Engineering Sciences, Ångström Laboratory, Box 534, SE-751 21 Uppsala University, Uppsala, Sweden* - Contact:
- Pierre E. Roy

For these calculations, a finite difference scheme has been used with 3D
spins on a 2D mesh (since the thickness of the particle is well below
the exchange length). Exchange interactions were calculated for 4
nearest neighbors using the 5-point approximation for the
Laplacian. Demagnetizing fields have been computed with FFT methods
(W.H. Press, B.P. Flannery, S.A. Teukolsky, William T. Vetterling,
*Numerical Recipes, The Art of Scientific Computing*, Cambridge
University Press 1988) and the analytical expressions for the evaluation
of the demagnetization tensor used were taken from Newell et
al. (A. J. Newell, W. Williams, and D. J. Dunlop,
*J. Geophys. Res.* **98**, 9551 (1993)). For the integration of
the Landau-Lifshitz equation of motion, a 4th order Runge-Kutta scheme
was implemented. Two discretization cell sizes have been considered: 5nm
and 2.5nm.

- Field applied at 170° from the
`x`-axis (Field 1):

Time evolution of spatially averaged magnetization components, 2.5 nm cells.

The magnetization distribution corresponding to the first time <`M`> = 0, with 2.5 nm cells._{x}

Color indicates`m`-component._{y}

Effects of cell size on time evolution of <`m`>._{y} - Field applied at 190° from the
`x`-axis (Field 2):

Time evolution of spatially averaged magnetization components, 2.5 nm cells.

The magnetization distribution corresponding to the first time <`M`> = 0, with 2.5 nm cells._{x}

Color indicates`m`-component._{y}

Effects of cell size on time evolution of <`m`>._{y}

- Field 1:

Time series for 2.5 nm mesh (8 716 324 bytes, compressed),

Time series for 5.0 nm mesh (2 852 259 bytes, compressed), and

Vector data (354 186 bytes) for 2.5 nm mesh at <`m`> = 0._{x} - Field 2:

Time series for 2.5 nm mesh (8 113 039 bytes),

Time series for 5.0 nm mesh (2 792 232 bytes), and

Vector data (355 755 bytes) for 2.5 nm mesh at <`m`> = 0._{x}

Vector data has 5 columns: `x, y` position in cells (each
cell is 2.5 nm), and `m _{x}, m_{y},
m_{z}` normalized vector components.

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21-DEC-2005