func main() {
fieldStrengthRange := [2]float32{1000, 1500}
rand.Seed(420) // For debug
field := &v.Vector3{}
v.V3MakeFromElems(field, rand.Float32(), rand.Float32(), rand.Float32())
v.V3ScalarMul(field, field, fieldStrengthRange[0])
fmt.Printf("Field Strength %v\n", field)
res, iterCount := nano.Calculate(field, dt, epsillon)
fmt.Printf("Magnetization %v, Count of the iterations: %v\n", res, iterCount)
}
func Calculate(field *v.Vector3, dt, epsillon float32) (magnetization *v.Vector3, iterCount int) {
//volume := (4. / 3.) * math.Pi * math.Pow(Radius, 3.)
//anisotropyAxis := &v.Vector3{}
//v.V3MakeFromElems(anisotropyAxis, rand.Float32(), rand.Float32(), rand.Float32())
magnetization = &v.Vector3{}
v.V3MakeFromElems(magnetization, rand.Float32(), rand.Float32(), rand.Float32())
iterCount = 0
for {
v.V3Normalize(magnetization, magnetization)
//fmt.Printf("magnetization %v\n", magnetization)
fieldEffectiveAnisotropy := &v.Vector3{}
fieldEffectiveAnisotropy.X = -Damping * magnetization.X
fieldEffectiveAnisotropy.Y = -Damping * magnetization.Y
fieldEffectiveAnisotropy.Z = 0.
fieldEffective := &v.Vector3{}
v.V3Add(fieldEffective, fieldEffectiveAnisotropy, field)
fieldR := &v.Vector3{}
{
vec := &v.Vector3{}
v.V3Cross(vec, fieldEffective, magnetization)
vec.X *= Damping
vec.Y *= Damping
vec.Z *= Damping
v.V3Sub(fieldR, fieldEffective, vec)
}
fieldM := fieldR.Length()
v.V3Normalize(fieldR, fieldR)
dte := (GyromagneticRatio * fieldM * dt) / (1 + float32(math.Pow(Damping, 2.)))
res := &v.Vector3{}
{
vec1 := &v.Vector3{}
v.V3Copy(vec1, fieldR)
dot := v.V3Dot(fieldR, magnetization)
vec1.X *= dot
vec1.Y *= dot
vec1.Z *= dot
dte2 := float32(math.Pow(float64(dte), 2.))
vec1.X *= dte2
vec1.Y *= dte2
vec1.Z *= dte2
vec2 := &v.Vector3{}
v.V3Cross(vec2, fieldR, magnetization)
vec2.X *= dte
vec2.Y *= dte
vec2.Z *= dte
v.V3Add(res, magnetization, vec1)
v.V3Add(res, res, vec2)
c := 1. / (1. + (dte2 * fieldR.LengthSqr()))
res.X *= c
res.Y *= c
res.Z *= c
}
{
v.V3Normalize(res, res)
vec := &v.Vector3{}
v.V3Cross(vec, res, magnetization)
dot := v.V3Dot(res, magnetization)
fmt.Printf("res - magnetization %v\n", vec.Length())
fmt.Printf("res - magnetization %v\n", dot)
}
magnetization = res
iterCount++
{
v.V3Normalize(fieldEffective, fieldEffective)
vec := &v.Vector3{}
v.V3Cross(vec, magnetization, fieldEffective)
fmt.Printf("Diff %v\n", vec.Length())
if vec.Length() <= epsillon {
break
}
}
}
return
}