Nuclear reflectivity
[1]:
import nexus as nx
import numpy as np
import matplotlib.pyplot as plt
# ------------------------- Fe layer --------------------------
mat_Fe = nx.Material.Template(nx.lib.material.Fe_enriched)
site = nx.Hyperfine(magnetic_field = 33,
magnetic_theta = 90,
magnetic_phi = 0)
mat_Fe.hyperfine_sites = [site]
lay_Fe = nx.Layer(id = "Fe",
material = mat_Fe,
thickness = 1.5,
roughness = 0.3
)
# ----------------------------- Pt layers -----------------------------
lay_Pt_top = nx.Layer(id = "Pt top",
material = nx.Material.Template(nx.lib.material.Pt),
thickness = 2,
roughness = 0.2
)
lay_Pt = nx.Layer(id = "Pt",
material = nx.Material.Template(nx.lib.material.Pt),
thickness = 15,
roughness = 0.2
)
# -------------------------- C layer ---------------------------
lay_C = nx.Layer(id = "C",
material = nx.Material.Template(nx.lib.material.C),
thickness = 10,
roughness = 0.3
)
# --------------------- substrate ---------------------------------
lay_substrate = nx.Layer(id = "Si sub",
material = nx.Material.Template(nx.lib.material.Si),
thickness = nx.inf,
roughness = 0.2
)
# --------------------- sample ---------------------------------
# is defined in reflection here
sample = nx.Sample(id = "simple layers",
layers = [lay_Pt_top,
lay_C,
lay_Fe,
lay_C,
lay_Pt,
lay_substrate],
geometry = "r",
length = 10,
roughness = "a")
beam = nx.Beam(fwhm = 0.2)
exp = nx.Experiment(beam = beam,
objects = [sample],
isotope = nx.lib.moessbauer.Fe57,
id = "my exp")
angles = np.arange(0.01, 1, 0.005)
nuc_ref = nx.NuclearReflectivity(experiment = exp,
sample = sample,
angles = angles,
time_start = 10,
time_stop = 192,
time_step = 0.2,
max_detuning = 400,
intensity_data = [],
scaling = "auto",
fit_weight = 1.0,
resolution = 0.001)
plt.semilogy(angles, nuc_ref())
plt.xlabel('angle (deg)')
plt.ylabel(r'time-integrated resonant intensity ($\Gamma$)')
plt.show()
-------------------------------------------------------------------------------------------
NEXUS WARNING in NuclearReflectivity
warning: Analytical roughness model of interface W matrix not valid! Output might be wrong!
At angle 0.995000 and at energy 14412.497000.
Wavevector kz * roughness.value = 0.380498 > 0.3 but should be << 1.
Encountered in Sample.id: simple layers - Layer.id: C - Layer.roughness: 0.300000
-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------
NEXUS WARNING in NuclearReflectivity
warning: Analytical roughness model of interface W matrix not valid! Output might be wrong!
At angle 0.995000 and at energy 14412.497000.
Wavevector kz * roughness.value = 0.380498 > 0.3 but should be << 1.
Encountered in Sample.id: simple layers - Layer.id: Fe - Layer.roughness: 0.300000
-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------
NEXUS WARNING in NuclearReflectivity
warning: Analytical roughness model of interface W matrix not valid! Output might be wrong!
At angle 0.995000 and at energy 14412.497000.
Wavevector kz * roughness.value = 0.380498 > 0.3 but should be << 1.
Encountered in Sample.id: simple layers - Layer.id: C - Layer.roughness: 0.300000
-------------------------------------------------------------------------------------------
[2]:
nuc_ref.Plot()
[3]:
detuning = np.linspace(-200, 200, 1001)
nuc_ref = nx.NuclearReflectivityEnergy(experiment = exp,
sample = sample,
angles = angles,
detuning = detuning,
intensity_data = [],
scaling = "auto",
background = 0,
fit_weight = 1.0,
resolution = 0.001,
time_gate =[])
plt.semilogy(angles, nuc_ref())
plt.xlabel('angle (deg)')
plt.ylabel(r'energy-integrated intensity ($\Gamma$)')
plt.show()
-------------------------------------------------------------------------------------------
NEXUS WARNING in NuclearReflectivityEnergy
warning: Analytical roughness model of interface W matrix not valid! Output might be wrong!
At angle 0.995000 and at energy 14412.497000.
Wavevector kz * roughness.value = 0.380498 > 0.3 but should be << 1.
Encountered in Sample.id: simple layers - Layer.id: C - Layer.roughness: 0.300000
-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------
NEXUS WARNING in NuclearReflectivityEnergy
warning: Analytical roughness model of interface W matrix not valid! Output might be wrong!
At angle 0.995000 and at energy 14412.497000.
Wavevector kz * roughness.value = 0.380498 > 0.3 but should be << 1.
Encountered in Sample.id: simple layers - Layer.id: Fe - Layer.roughness: 0.300000
-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------
NEXUS WARNING in NuclearReflectivityEnergy
warning: Analytical roughness model of interface W matrix not valid! Output might be wrong!
At angle 0.995000 and at energy 14412.497000.
Wavevector kz * roughness.value = 0.380498 > 0.3 but should be << 1.
Encountered in Sample.id: simple layers - Layer.id: C - Layer.roughness: 0.300000
-------------------------------------------------------------------------------------------
[4]:
nuc_ref.Plot()
