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"# Mode profiles and their animations (movies)\n",
"\n",
"This notebook will calculate the dispersion relation of a film with 50 nm thickness and permalloy material parameters. \n",
"\n",
"The dispersion is computed for the Damon-Eshbach geometry, wave vector perpendicular to the ground magnetic state stabilized by an external static magnetic field of 20 mT.\n",
"\n",
"First we import the TetraX package."
]
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"id": "3d756347",
"metadata": {},
"outputs": [],
"source": [
"import tetrax as tx"
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"source": [
"Let's create the 50 nm thick permalloy film..."
]
},
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"execution_count": 2,
"id": "c4960121",
"metadata": {
"scrolled": true
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"py_film = tx.Sample(\n",
" tx.geometries.layer.monolayer(50,2),\n",
" name=\"Monolayer_mode_movie\",\n",
" geometry_type=\"layer\")\n",
"\n",
"py_film.material = tx.materials.permalloy"
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},
{
"cell_type": "markdown",
"id": "da0dba76",
"metadata": {},
"source": [
"... and compute the dispersion with the applied external field:"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "eca15bb0",
"metadata": {},
"outputs": [
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"name": "stderr",
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"text": [
"100%|███████████████████| 81/81 [00:01<00:00, 45.32it/s]\n"
]
}
],
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"py_film.mag = (1,0,0)\n",
"py_film.Bext = (20e-3,0,0)\n",
"spectrum = tx.experiments.eigenmodes(py_film,kmin=0,kmax=40e6,num_modes=5,num_cpus=-1,save_mode_profiles=True)"
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"First, we plot the dispersion, using the built-in `plot()` method:"
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""
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"## Show modes and animate them\n",
"\n",
"The `spectrum` result object of the `eigenmodes` experiment has a built-in method `show_mode`, to visualize the modes od a given wave vector `k`, mode number `n` and azimuthal mode number `m` for axial geometries.\n",
"\n",
"Most important options for the visualization and animation are:\n",
"\n",
" - wave vector k=..., in [rad/m]\n",
" - mode number n=...\n",
" - mode number m=... # for axial geometries\n",
" - scaling the magnetization, scale=...,\n",
" - scaling the dynamical components, scale_mode=...\n",
" - with or without the equilibrium magnetization, on_equilibrium=True or False\n",
" - animated = True or False\n",
" - the requested periods, periods=...\n",
" - frames_per_period=...\n",
" - frames per seconds, fps=... \n"
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"- Below you find an example for a Daemon-Eshbach surface mode, namely the mode with n=1 for k=10 (rad/µm), choosing 10 periods, 30 frames per seconds, etc...\n",
" \n",
"- This mode, as expected, is localized mostly to one of the surfaces."
]
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"id": "65eb3a58",
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"name": "stderr",
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"text": [
"/Users/attilak/micromag/tetrax-tests/fresh_environement_test/venv/lib/python3.13/site-packages/traittypes/traittypes.py:97: UserWarning:\n",
"\n",
"Given trait value dtype \"float32\" does not match required type \"float32\". A coerced copy has been created.\n",
"\n"
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"Output()"
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"spectrum.show_mode(k=10e6,n=1,periods=10,animated=True,scale=10,fps=30,scale_mode=2)"
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