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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/StandardSample/MagneticLayersBuilder.cpp
//! @brief Implements class to build samples with magnetic layers.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "Sample/StandardSample/MagneticLayersBuilder.h"
#include "Base/Const/Units.h"
#include "Base/Util/Assert.h"
#include "Sample/Aggregate/ParticleLayout.h"
#include "Sample/HardParticle/Sphere.h"
#include "Sample/Interface/Roughness.h"
#include "Sample/Material/MaterialFactoryFuncs.h"
#include "Sample/Multilayer/Layer.h"
#include "Sample/Multilayer/Sample.h"
#include "Sample/Particle/Particle.h"
#include "Sample/Scattering/Rotations.h"
#include <map>
using Units::deg;
namespace {
const double sphere_radius = 5;
} // namespace
// ************************************************************************************************
Sample* ExemplarySamples::createMagneticSubstrateZeroField()
{
R3 substr_field(0.0, 0.0, 0.0);
R3 particle_field(0.1, 0.0, 0.0);
Material vacuum_material = RefractiveMaterial("Vacuum", 0.0, 0.0);
Material substrate_material = RefractiveMaterial("Substrate", 7e-6, 2e-8, substr_field);
Material particle_material = RefractiveMaterial("MagParticle", 6e-4, 2e-8, particle_field);
ParticleLayout particle_layout;
R3 position(0.0, 0.0, -10.0);
Sphere ff_sphere(sphere_radius);
Particle particle(particle_material, ff_sphere);
particle.translate(position);
particle_layout.addParticle(particle);
Layer vacuum_layer(vacuum_material);
Layer substrate_layer(substrate_material);
substrate_layer.addLayout(particle_layout);
auto* sample = new Sample;
sample->addLayer(vacuum_layer);
sample->addLayer(substrate_layer);
return sample;
}
// ************************************************************************************************
Sample* ExemplarySamples::createSimpleMagneticLayer()
{
auto* sample = new Sample;
R3 layer_field = R3(0.0, 1e8, 0.0);
Material vacuum_material = MaterialBySLD("Vacuum", 0.0, 0.0);
Material layer_material = MaterialBySLD("MagLayer", 1e-4, 1e-8, layer_field);
Material substrate_material = MaterialBySLD("Substrate", 7e-5, 2e-6);
Layer vacuum_layer(vacuum_material);
Layer intermediate_layer(layer_material, 10.0); // 10 nm layer thickness
Layer substrate_layer(substrate_material);
sample->addLayer(vacuum_layer);
sample->addLayer(intermediate_layer);
sample->addLayer(substrate_layer);
return sample;
}
// ************************************************************************************************
Sample* ExemplarySamples::createMagneticLayer()
{
auto* sample = new Sample;
R3 layer_field = R3(0.0, 0.0, 1e6);
R3 particle_field(1e6, 0.0, 0.0);
Material vacuum_material = RefractiveMaterial("Vacuum0", 0.0, 0.0);
Material layer_material = RefractiveMaterial("Vacuum1", 0.0, 0.0, layer_field);
Material substrate_material = RefractiveMaterial("Substrate", 7e-6, 2e-8);
Material particle_material = RefractiveMaterial("MagParticle", 6e-4, 2e-8, particle_field);
ParticleLayout particle_layout;
Sphere ff_sphere(sphere_radius);
Particle particle(particle_material, ff_sphere);
particle_layout.addParticle(particle);
Layer vacuum_layer(vacuum_material);
vacuum_layer.addLayout(particle_layout);
Layer substrate_layer(substrate_material);
sample->addLayer(vacuum_layer);
sample->addLayer(substrate_layer);
return sample;
}
// ************************************************************************************************
Sample* ExemplarySamples::createSimpleMagneticRotationWithRoughness(const std::string& roughnessKey)
{
double sigmaRoughness = 0.;
std::unique_ptr<TransientModel> transient;
if (roughnessKey == "Flat") {
sigmaRoughness = 0.;
transient = std::make_unique<TanhTransient>();
} else if (roughnessKey == "Tanh") {
sigmaRoughness = 2. * Units::angstrom;
transient = std::make_unique<TanhTransient>();
} else if (roughnessKey == "Erf") {
sigmaRoughness = 2. * Units::angstrom;
transient = std::make_unique<ErfTransient>();
} else
ASSERT_NEVER;
auto* sample = new Sample;
R3 substr_field = R3(0.0, 1e6, 0.0);
R3 layer_field = R3(1e6, 1e6, 0.0);
Material vacuum_material = RefractiveMaterial("Vacuum", 0.0, 0.0);
Material substrate_material = RefractiveMaterial("Substrate", 7e-6, 2e-8, substr_field);
Material layer_material = RefractiveMaterial("MagLayer", 6e-4, 2e-8, layer_field);
SelfAffineFractalModel autocorrelation(sigmaRoughness, 0.7, 25);
auto roughness = Roughness(&autocorrelation, transient.get());
Layer vacuum_layer(vacuum_material);
Layer layer(layer_material, 200 * Units::angstrom, &roughness);
Layer substrate_layer(substrate_material, &roughness);
sample->addLayer(vacuum_layer);
sample->addLayer(layer);
sample->addLayer(substrate_layer);
return sample;
}
// ************************************************************************************************
Sample* ExemplarySamples::createMagneticRotation()
{
auto* sample = new Sample;
R3 substr_field = R3(0.0, 1e6, 0.0);
R3 particle_field(1e6, 0.0, 0.0);
Material vacuum_material = RefractiveMaterial("Vacuum", 0.0, 0.0);
Material substrate_material = RefractiveMaterial("Substrate", 7e-6, 2e-8, substr_field);
Material particle_material = RefractiveMaterial("MagParticle", 6e-4, 2e-8, particle_field);
ParticleLayout particle_layout;
R3 position(0.0, 0.0, -10.0);
Sphere ff_sphere(sphere_radius);
Particle particle(particle_material, ff_sphere);
RotationZ rot_z(20 * deg);
particle.rotate(rot_z);
particle.translate(position);
particle_layout.addParticle(particle);
Layer vacuum_layer(vacuum_material);
Layer substrate_layer(substrate_material);
substrate_layer.addLayout(particle_layout);
sample->addLayer(vacuum_layer);
sample->addLayer(substrate_layer);
return sample;
}
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