Class SpinPumping

java.lang.Object

org.episteme.apps.apps.physics.spintronics.SpinPumping

public class SpinPumping
extends Object

Spin Pumping effect at magnetodynamic interfaces.

Precessing magnetization injects spin current into adjacent non-magnetic layer. Detected via DC voltage from ISHE or spin accumulation.

Physics

Spin current from FMR-driven precession: J_s = (hbar/4pi) * g_eff * (m x dm/dt)

References

• Tserkovnyak, Y. et al. (2002). "Enhanced Gilbert damping in thin ferromagnetic films". Phys. Rev. Lett., 88, 117601. DOI: 10.1103/PhysRevLett.88.117601

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Constructor Summary

Constructors

Constructor	Description
SpinPumping(Real gUpDown, Real tFM, Real tNM, SpinOrbitTorque.HeavyMetal nm)

Method Summary

Modifier and Type	Method	Description
Real	calculateDampingEnhancement(Real ms, Real gFactor)	Calculates additional Gilbert damping from spin pumping.
Real	calculateFMRVoltage(Real rfField, Real frequency, Real linewidth, Real ms)	Calculates DC voltage from ISHE rectification during FMR.
Real[]	calculateSpinCurrent(Real[] m, Real[] dmdt)	Calculates pumped spin current from magnetization precession.
static SpinPumping	createNiFePt()
Real	getSpinMixingConductance()

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SpinPumping

public SpinPumping(Real gUpDown,
 Real tFM,
 Real tNM,
 SpinOrbitTorque.HeavyMetal nm)

Method Details

calculateSpinCurrent

public Real[] calculateSpinCurrent(Real[] m,
 Real[] dmdt)

Calculates pumped spin current from magnetization precession.

Parameters:

m - Current magnetization (unit vector)

dmdt - Time derivative of magnetization

Returns:

Spin current density (A/m^2)

calculateDampingEnhancement

public Real calculateDampingEnhancement(Real ms,
 Real gFactor)

Calculates additional Gilbert damping from spin pumping. Delta_alpha = g * mu_B * g_updown / (4pi * M_s * t_FM)

calculateFMRVoltage

public Real calculateFMRVoltage(Real rfField,
 Real frequency,
 Real linewidth,
 Real ms)

Calculates DC voltage from ISHE rectification during FMR.

Parameters:

rfField - AC driving field amplitude (A/m)

frequency - FMR frequency (Hz)

linewidth - FMR linewidth (Hz)

ms - Saturation magnetization

Returns:

DC voltage (V)

createNiFePt

public static SpinPumping createNiFePt()

getSpinMixingConductance

public Real getSpinMixingConductance()