1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Polarized specular reflectivity with B field in -Z direction.
Tests the numerical singularity in eigenToMatrix() when B_z = -1.
Sample: Vacuum | MagLayer (10 nm, B=(0,0,-1e8)) | Substrate.
Two channels: PP and MM with Y-axis polarization.
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import angstrom, deg, nm, R3
def get_sample():
layer_field = R3(0, 0, -1e8)
layer_color = (0.86, 0.24, 0.18)
layer_mat = ba.SLDMaterial("MagLayer", layer_color, 1e-4, 1e-8, layer_field)
substrate_color = (0.28, 0.57, 0.82)
substrate_mat = ba.SLDMaterial("Substrate", substrate_color, 7e-5, 2e-6)
sample = ba.Sample()
sample.addLayer(ba.Layer(ba.Vacuum()))
sample.addLayer(ba.Layer(layer_mat, 10*nm))
sample.addLayer(ba.Layer(substrate_mat))
return sample
def simulate(sample, pol, an, title):
n = 500
scan = ba.AlphaScan(n, 5*deg/n, 5*deg)
scan.setWavelength(1.54*angstrom)
scan.setPolarization(pol)
scan.setAnalyzer(an)
result = ba.SpecularSimulation(scan, sample).simulate()
result.setTitle(title)
return result
if __name__ == '__main__':
sample = get_sample()
ba.showSample3D(sample, sample_size=80*nm, seed=0)
results = [
simulate(sample, R3(0, +1, 0), R3(0, +1, 0), "PP"),
simulate(sample, R3(0, -1, 0), R3(0, -1, 0), "MM"),
]
ba.plot_multicurve(results)
ba.plt.show()
|
BornAgain
≻ git-develop
≻ Documentation ≻ Examples ≻ Specular ≻ Magnetic and polarized ≻ Magnetic field minus Z
