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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Polarized neutron reflectometry of a simple magnetic layer in Q-space.
Two-channel (PP, MM) Q-scan with Y-axis polarization.
Results must agree with BasicSpecular.py (angle-scan equivalent).
"""
from math import pi, sin
import numpy as np
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import angstrom, deg, nm, R3
def get_sample():
vacuum = ba.Vacuum()
layer_color = (0.86, 0.24, 0.18)
layer_mat = ba.SLDMaterial("MagLayer", layer_color, 1e-4, 1e-8,
R3(0, 1e8, 0))
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(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
lam = 1.54*angstrom
qs = [4*pi*sin(a)/lam
for a in np.linspace(5*deg/n, 5*deg, n)]
scan = ba.QzScan(qs)
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()
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BornAgain
≻ git-develop
≻ Documentation ≻ Examples ≻ Specular ≻ Magnetic and polarized ≻ Polarized Q angle reflectivity
