API reference

SpinWaveToolkit is an open-source Python package providing analytical tools for spin-wave physics and research.

Below you will find links to detailed documentation for constants, classes, functions, and submodules.

API Sections

• Constants
  • MU0
  • C
  • HBAR
  • KB
• Classes
  • SpinWaveToolkit.Material
  • SpinWaveToolkit.MacrospinEquilibrium
  • SpinWaveToolkit.SingleLayer
  • SpinWaveToolkit.SingleLayerNumeric
  • SpinWaveToolkit.DoubleLayerNumeric
  • SpinWaveToolkit.SingleLayerSCcoupled
  • SpinWaveToolkit.BulkPolariton
• Functions
  • General functions
• Submodules
  • SpinWaveToolkit.bls

SpinWaveToolkit

This module provides analytical tools in spin-wave physics.

Submodules

bls

Modelling Brillouin light scattering signal.

Classes

Material

Class for magnetic materials used in spin wave research.

MacrospinEquilibrium

Compute the static macrospin equilibrium direction.

SingleLayer

Compute spin-wave characteristics in dependance to k-vector for a single layer using an analytical model of Kalinikos and Slavin.

SingleLayerNumeric

Compute spin-wave characteristics in dependance to k-vector for a single layer using a numerical approach by Tacchi et al.

DoubleLayerNumeric

Compute spin-wave characteristics in dependance to k-vector for a double layer using a numerical model of Gallardo et al.

SingleLayerSCcoupled

Compute spin-wave characteristics in dependance to k-vector for a single ferromagnetic layer dipolarly coupled to a superconductor using a semi-analytical model of Zhou et al.

Constants

MU0float

(N/A^2) magnetic permeability of free space.

Cfloat

(m/s) speed of free-space light.

KBfloat

(J/K) Boltzmann constant.

HBARfloat

(J s) reduced Planck constant.

NiFeMaterial

Predefined material NiFe (permalloy).

CoFeBMaterial

Predefined material CoFeB.

FeNiMaterial

Predefined material FeNi (metastable iron).

YIGMaterial

Predefined material YIG.

Functions

wavenumber2wavelength(wavenumber)	Convert wavelength to wavenumber.
wavelength2wavenumber(wavelength)	Convert wavenumber to wavelength.
wrapAngle(angle[, amin, amax])	Wrap angle in radians to range [amin, amax), by default [0, 2*np.pi).
rootsearch(f, a, b, dx[, args])	Search for a root of a continuous function within an interval [a, b].
bisect(f, x1, x2[, epsilon, args])	Simple bisection method of root finding.
roots(f, a, b[, dx, eps, args])	Find all roots of a continuous function f(x, *args) within a given interval [a, b].
distBE(w[, temp, mu])	Returns Bose-Einstein distribution for given chemical potential and temperature.
sphr2cart(theta, phi[, r])	Convert spherical coordinates to cartesian.
cart2sphr(x, y, z)	Convert cartesian coordinates to spherical.

Example

Example of calculation of the dispersion relation f(k_xi), and other important quantities, for the lowest-order mode in a 30 nm thick NiFe (Permalloy) layer.

import numpy as np
import SpinWaveToolkit as SWT

kxi = np.linspace(1e-6, 150e6, 150)

PyChar = SWT.SingleLayer(Bext=20e-3, kxi=kxi, theta=np.pi/2,
                         phi=np.pi/2, d=30e-9, weff=2e-6,
                         boundary_cond=2, material=SWT.NiFe)
DispPy = PyChar.GetDispersion()*1e-9/(2*np.pi)  # GHz
vgPy = PyChar.GetGroupVelocity()*1e-3  # km/s
lifetimePy = PyChar.GetLifetime()*1e9  # ns
decLen = PyChar.GetDecLen()*1e6  # um

@authors:

Ondrej Wojewoda, ondrej.wojewoda@ceitec.vutbr.cz Jan Klima, jan.klima4@vutbr.cz Dominik Pavelka, dominik.pavelka@vutbr.cz Michal Urbanek, michal.urbanek@ceitec.vutbr.cz