## Magnetic particles

This example demonstrates how to include particles with non-zero magnetization. The sample consist on magnetic spherical particles embedded in the substrate of a simple 2-layer system. The beam is polarized and the analysis focuses on the spin-flip channel.

A more detailed description of this example can be found in the Magnetic Particles Tutorial.

  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 51 52 53 54 55 56 57 58 59 60 61 62 63 64  #!/usr/bin/env python3 """ Simulation demo: magnetic spheres in substrate """ import bornagain as ba from bornagain import deg, nm, kvector_t def get_sample(): """ Returns a sample with magnetic spheres in the substrate. """ # Define materials magnetic_field = kvector_t(0, 0, 10000000) material_Particle = ba.HomogeneousMaterial("Particle", 2e-05, 4e-07, magnetic_field) material_Substrate = ba.HomogeneousMaterial("Substrate", 7e-06, 1.8e-07) material_Vacuum = ba.HomogeneousMaterial("Vacuum", 0.0, 0.0) # Define form factors ff = ba.FormFactorFullSphere(5.0*nm) # Define particles particle = ba.Particle(material_Particle, ff) particle_position = kvector_t(0.0*nm, 0.0*nm, -10.0*nm) particle.setPosition(particle_position) # Define particle layouts layout = ba.ParticleLayout() layout.addParticle(particle, 1.0) layout.setWeight(1) layout.setTotalParticleSurfaceDensity(0.01) # Define layers layer_1 = ba.Layer(material_Vacuum) layer_2 = ba.Layer(material_Substrate) layer_2.addLayout(layout) # Define sample sample = ba.MultiLayer() sample.addLayer(layer_1) sample.addLayer(layer_2) return sample def get_simulation(sample): beam = ba.Beam(1e+12, 0.1*nm, ba.Direction(0.5*deg, 0*deg)) beam_polarization = kvector_t(0.0, 0.0, 1.0) beam.setPolarization(beam_polarization) detector = ba.SphericalDetector(200, 6*deg, 0*deg, 3*deg) simulation = ba.GISASSimulation(beam, sample, detector) analyzer_direction = kvector_t(0.0, 0.0, -1.0) simulation.setAnalyzerProperties(analyzer_direction, 1.0, 0.5) return simulation if __name__ == '__main__': import ba_plot sample = get_sample() simulation = get_simulation(sample) ba_plot.run_and_plot(simulation) 
MagneticSpheres.py