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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Polarized neutron reflectometry of a single magnetic layer on a
substrate. TanhTransient interface roughness.
Four-channel (PP, PM, MP, MM) angle-scan. The layer magnetization
is tilted 45 deg from the Y axis (R3(1, 1, 0) direction), enabling
spin-flip scattering (PM, MP non-zero).
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import angstrom, deg, nm, R3
def get_sample():
layer_field = R3(1e6, 1e6, 0)
substr_field = R3(0, 1e6, 0)
layer_color = (0.86, 0.24, 0.18)
layer_mat = ba.RefractiveMaterial(
"MagLayer", layer_color, 6e-4, 2e-8, layer_field)
substrate_color = (0.28, 0.57, 0.82)
substrate_mat = ba.RefractiveMaterial(
"Substrate", substrate_color, 7e-6, 2e-8, substr_field)
autocorr = ba.SelfAffineFractalModel(0.2*nm, 0.7, 25*nm)
roughness = ba.Roughness(autocorr, ba.TanhTransient())
sample = ba.Sample()
sample.addLayer(ba.Layer(ba.Vacuum()))
sample.addLayer(ba.Layer(layer_mat, 20*nm, roughness))
sample.addLayer(ba.Layer(substrate_mat, roughness))
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), "PM"),
simulate(sample, R3(0, -1, 0), R3(0, +1, 0), "MP"),
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 rotation reflectivity
