mag

Documentation

Index

• Constants
• func CalcDemagKernel(inputSize, pbc [3]int, cellsize [3]float64, accuracy float64) (kernel [3][3]*data.Slice)
• func DemagKernel(inputSize, pbc [3]int, cellsize [3]float64, accuracy float64, cacheDir string) (kernel [3][3]*data.Slice)
• func LoadKernel(fname string) (kernel *data.Slice, err error)
• func MFMKernel(mesh *d.Mesh, lift, tipsize float64) (kernel [3]*d.Slice)
• func SaveKernel(fname string, kernel *data.Slice) error

Constants

const (
	Mu0 = 4 * math.Pi * 1e-7 // Permeability of vacuum in Tm/A
	MuB = 9.2740091523E-24   // Bohr magneton in J/T
	Kb  = 1.380650424E-23    // Boltzmann's constant in J/K
	Qe  = 1.60217646E-19     // Electron charge in C
)

const (
	X = 0
	Y = 1
	Z = 2
)

const SMALL_N = 5

Use 2N-1 padding instead of 2N for sizes up to SMALL_N. 5 seems a good choice since for all n<=5, 2*n-1 only has prime factors 2,3,5,7 (good CUFFT performance). starting from 6 it becomes problematic so we use 2*n.

Functions

func CalcDemagKernel

func CalcDemagKernel(inputSize, pbc [3]int, cellsize [3]float64, accuracy float64) (kernel [3][3]*data.Slice)

Calculates the magnetostatic kernel by brute-force integration of magnetic charges over the faces and averages over cell volumes.

func DemagKernel

func DemagKernel(inputSize, pbc [3]int, cellsize [3]float64, accuracy float64, cacheDir string) (kernel [3][3]*data.Slice)

Obtains the demag kernel either from cacheDir/ or by calculating (and then storing in cacheDir for next time). Empty cacheDir disables caching.

func LoadKernel

func LoadKernel(fname string) (kernel *data.Slice, err error)

func MFMKernel

func MFMKernel(mesh *d.Mesh, lift, tipsize float64) (kernel [3]*d.Slice)

func SaveKernel

func SaveKernel(fname string, kernel *data.Slice) error