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#!/usr/bin/env python3
"""
Example of simulating a rough sample with a
tanh and Nevot-Croce roughness model using BornAgain.
"""
import bornagain as ba
from bornagain import angstrom, nm, ba_plot as bp, deg
def get_sample(transient):
# create materials
vacuum = ba.MaterialBySLD("Vacuum", 0, 0)
material_ti = ba.MaterialBySLD("Ti", -1.9493e-06, 0)
material_ni = ba.MaterialBySLD("Ni", 9.4245e-06, 0)
material_substrate = ba.MaterialBySLD("SiSubstrate", 2.0704e-06, 0)
# Roughness
autocorr = ba.SelfAffineFractalModel(1*nm, 0.7, 25*nm)
roughness = ba.Roughness(autocorr, transient)
# create layers
ambient_layer = ba.Layer(vacuum)
ti_layer = ba.Layer(material_ti, 3*nm, roughness)
ni_layer = ba.Layer(material_ni, 7*nm, roughness)
substrate_layer = ba.Layer(material_substrate, roughness)
# create periodic stack
n_repetitions = 10
stack = ba.LayerStack(n_repetitions)
stack.addLayer(ti_layer)
stack.addLayer(ni_layer)
# create sample
sample = ba.Sample()
sample.addLayer(ambient_layer)
sample.addStack(stack)
sample.addLayer(substrate_layer)
return sample
def get_simulation(sample):
n = 500
scan = ba.AlphaScan(n, 2*deg/n, 2*deg)
scan.setWavelength(1.54*angstrom)
return ba.SpecularSimulation(scan, sample)
def simulate(roughness_model, title):
"""
Runs simulation and returns its result.
"""
sample = get_sample(roughness_model)
simulation = get_simulation(sample)
result = simulation.simulate()
result.setTitle(title)
return result
if __name__ == '__main__':
results = [
simulate(ba.ErfTransient(), "Névot-Croce"),
simulate(ba.TanhTransient(), "Tanh"),
]
bp.plot_multicurve(results)
bp.plt.show()
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