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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Polarized GISAS (++ and -+ channels) of magnetic spheres in a magnetic
layer.
Spheres with x-oriented magnetisation (1e6 A/m) are deposited on a
magnetic substrate. The ++ and -+ polarisation channels show non-spin-flip
and spin-flip scattering, respectively.
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import deg, nm, R3
def get_sample():
vacuum = ba.Vacuum()
substrate_color = (0.28, 0.57, 0.82)
substrate_mat = ba.RefractiveMaterial("Substrate", substrate_color, 7e-6, 2e-8)
particle_color = (0.86, 0.24, 0.18)
particle_mat = ba.RefractiveMaterial("MagParticle", particle_color, 6e-4, 2e-8,
R3(1e6, 0, 0))
ff = ba.Sphere(5*nm)
particle = ba.Particle(particle_mat, ff)
vacuum_layer = ba.Layer(vacuum)
vacuum_layer.deposit2D(ba.Dilute2D(0.001, particle))
substrate_layer = ba.Layer(substrate_mat)
sample = ba.Sample()
sample.addLayer(vacuum_layer)
sample.addLayer(substrate_layer)
return sample
def get_simulation(sample, pol_dir, an_dir):
beam = ba.Beam(1e9, 0.1*nm, 0.2*deg)
n = 200
detector = ba.SphericalDetector(n, -2*deg, 2*deg, n, 0, 2*deg)
beam.setPolarization(pol_dir)
detector.setAnalyzer(an_dir)
return ba.ScatteringSimulation(beam, sample, detector)
def simulate(pol_dir, an_dir):
sample = get_sample()
simulation = get_simulation(sample, pol_dir, an_dir)
return simulation.simulate()
if __name__ == '__main__':
z_up = R3(0, 0, 1)
z_dn = R3(0, 0, -1)
results = [
simulate(z_up, z_up), # PP
simulate(z_dn, z_up), # MP
]
results[0].setTitle("$++$")
results[1].setTitle("$-+$")
ba.showSample3D(get_sample(), sample_size=120*nm, seed=0)
ba.plot2d_to_row(results, unit_aspect=1)
ba.plt.show()
|
BornAgain
≻ git-develop
≻ Documentation ≻ Examples ≻ GISAS ≻ Magnetic scattering ≻ Magnetic spheres in mag layer
