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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Polarized neutron reflectometry of a 4x Fe/Ni bilayer on Au substrate.
Two-channel (PP, MM) angle-scan with Y-axis polarization, no roughness.
The Fe magnetization is aligned along Y; PM and MP are exactly zero.
See PolarizedFeNiBilayerSpinFlip.py for the four-channel variant
(38 deg magnetization tilt, PM and MP non-zero).
Compare PolarizedFeNiBilayerQ.py for the Q-space equivalent,
and PolarizedFeNiBilayerTanh.py for the roughness variant.
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import angstrom, deg, nm, R3
def get_sample():
vacuum = ba.Vacuum()
mag_vec = R3(0, 1e7, 0)
fe_color = (0.48, 0.32, 0.80)
fe_mat = ba.SLDMaterial("Fe", fe_color, 8.02e-6, 0, mag_vec)
ni_color = (0.93, 0.48, 0.14)
ni_mat = ba.SLDMaterial("Ni", ni_color, 9.4245e-6, 0)
substrate_color = (0.93, 0.72, 0.25)
substrate_mat = ba.SLDMaterial("Au", substrate_color, 4.6665e-6, 0)
stack = ba.LayerStack(4)
stack.addLayer(ba.Layer(fe_mat, 10*nm))
stack.addLayer(ba.Layer(ni_mat, 4*nm))
sample = ba.Sample()
sample.addLayer(ba.Layer(vacuum))
sample.addStack(stack)
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=120*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 ≻ Polarized Fe Ni bilayer
