SpinWaveToolkit.Material

class SpinWaveToolkit.Material(Ms, Aex, alpha, mu0dH0=0, gamma=176557507131.74637, Ku=0)

Class for magnetic materials used in spin wave research.

To define a custom material, type

MyNewMaterial = Material(Ms=MyMS, Aex=MyAex, alpha=MyAlpha, gamma=MyGamma)

Parameters:

Msfloat

(A/m) saturation magnetization.

Aexfloat

(J/m) exchange stiffness constant.

alphafloat

() Gilbert damping.

gammafloat, optional

(rad*Hz/T) gyromagnetic ratio. Default 28.1e9*2*np.pi.

mu0dH0float, optional

20. inhomogeneous broadening. Default is 0.

Kufloat, optional

(J/m^2) surface anisotropy strength. Default is 0. (Currently unused in any dispersion calculations.)

Attributes:

same as Parameters

Methods

get_pinning()

Calculates the symmetric pinning parameter on a surface with a given surface anisotropy.

See also

SingleLayer, SingleLayerNumeric, DoubleLayerNumeric

get_pinning()

Calculates the symmetric pinning parameter on a surface with a given surface anisotropy. The result is in rad/m. p=-2*np.pi*Ku/Aex

### Is this correct?

https://doi.org/10.1103/PhysRevB.83.174417

Table of pre-defined materials

All of these are instances of the SpinWaveToolkit.Material class.

Material	Ms (kA/m)	Aex (pJ/m)	alpha (10^-4)	gamma/2pi (GHz/T)	mu0dH0 (mT)	Ku (J/m^2)
SpinWaveToolkit.NiFe	800	16	70	28.8	0	0
SpinWaveToolkit.CoFeB	1250	15	40	30	0	0
SpinWaveToolkit.FeNi	1410	11	80	28.1	0	0
SpinWaveToolkit.YIG	140	3.6	1.5	28	0.18	0