## Basic specular reflectometry example

As introductory example, we simulate specular reflectometry by a sample that consists of 10 Ti/Ni double layers on a Si substrate.

##### Full script

The same script has been used in the tutorial to explain usage and syntax of BornAgain Python code.

Root class reference: SpecularSimulation.

  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  #!/usr/bin/env python3 """ Basic example of specular reflectometry simulation. """ import bornagain as ba from bornagain import ba_plot as bp, deg, angstrom def get_sample(): """ Sample consisting of 20 alternating Ti and Ni layers. """ # Define materials m_ambient = ba.MaterialBySLD("Vacuum", 0, 0) m_ti = ba.MaterialBySLD("Ti", -1.9493e-06, 0) m_ni = ba.MaterialBySLD("Ni", 9.4245e-06, 0) m_substrate = ba.MaterialBySLD("SiSubstrate", 2.0704e-06, 0) # Define layers ambient_layer = ba.Layer(m_ambient) ti_layer = ba.Layer(m_ti, 30*angstrom) ni_layer = ba.Layer(m_ni, 70*angstrom) substrate_layer = ba.Layer(m_substrate) # Define sample sample = ba.MultiLayer() sample.addLayer(ambient_layer) for _ in range(10): sample.addLayer(ti_layer) sample.addLayer(ni_layer) sample.addLayer(substrate_layer) return sample def get_simulation(sample): n = bp.simargs['n'] scan = ba.AlphaScan(n, 2*deg/n, 2*deg) scan.setWavelength(1.54*angstrom) return ba.SpecularSimulation(scan, sample) if __name__ == '__main__': bp.parse_args(sim_n=500) sample = get_sample() simulation = get_simulation(sample) result = simulation.simulate() bp.plot_simulation_result(result) 
Examples/specular/AlternatingLayers1.py
##### Shorthand with standard sample

Since we will use the same sample in several other examples, we provide the shorthand std_samples.alternating_layers() so that the above script can be shortened as

  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  #!/usr/bin/env python3 """ Basic example of specular reflectometry simulation, using a standard sample from Wrap/Python/std_samples.py. """ import bornagain as ba from bornagain import ba_plot as bp, deg, angstrom, std_samples def get_sample(): return std_samples.alternating_layers() def get_simulation(sample): n = bp.simargs['n'] scan = ba.AlphaScan(n, 2*deg/n, 2*deg) scan.setWavelength(1.54*angstrom) return ba.SpecularSimulation(scan, sample) if __name__ == '__main__': bp.parse_args(sim_n=500) sample = get_sample() simulation = get_simulation(sample) result = simulation.simulate() bp.plot_simulation_result(result) 
Examples/specular/AlternatingLayers2.py