Intrinsic Coupling between Current and Domain Wall Motion in (Ga,Mn)As

Hals, Kjetil M. D.; Nguyen, Anh Kiet; Brataas, Arne

doi:10.1103/physrevlett.102.256601

Cited by 42 publications

(65 citation statements)

References 28 publications

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“…31,32 Nearly a century ago it was discovered that in macroscopic bodies the magnetization of a ferromagnet couples to the mechanical degree of freedom: Barnett demonstrated that a mechanical rotation of a demagnetized ferromagnet creates a net magnetization along the rotation axis, 33 whereas Einstein and de Haas showed that reversing the magnetic moment of a ferromagnetic cylinder induces a mechanical torque. 34 Both effects are governed by the same gyromagnetic tensor.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale magnetic heat pumps and engines

et al. 2010

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We present the linear-response matrix for a sliding domain wall in a rotatable magnetic nanowire, which is driven out of equilibrium by temperature and voltage bias, mechanical torque, and magnetic field. An expression for heat-current-induced domain-wall motion is derived. Application of Onsager's reciprocity relation leads to a unified description of the Barnett and Einstein-de Haas effects as well as spin-dependent thermoelectric properties. We envisage various heat pumps and engines, such as coolers driven by magnetic fields or mechanical rotation as well as nanoscale motors that convert temperature gradients into useful work. All parameters ͑with the exception of mechanical friction͒ can be computed microscopically by the scattering theory of transport.

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Section: Introductionmentioning

confidence: 99%

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et al. 2010

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“…In metals it also covers the appearance of a DW resistance at abrupt interfaces [55][56][57][58], leading to a momentum transfer force [7,[59][60][61][62] never clearly identified experimentally [63]. Two contributions have been identified in the spin-relaxation nonadiabatic torque.…”

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confidence: 94%

Spin transfer and spin-orbit torques in in-plane magnetized (Ga,Mn)As tracks

et al. 2017

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Current-driven domain wall motion is investigated experimentally in in-plane magnetized (Ga,Mn)As tracks. The wall dynamics is found to differ in two important ways with respect to perpendicularly magnetized (Ga,Mn)As: the wall mobilities are up to ten times higher and the walls move in the same direction as the hole current. We demonstrate that these observations cannot be explained by spin-orbit field torques (Rashba and Dresselhaus types) but are consistent with nonadiabatic spin transfer torque enhanced by the strong spin-orbit coupling of (Ga,Mn)As. This mechanism opens the way to domain wall motion driven by bulk rather than interfacial spin-orbit coupling as in ultrathin ferromagnet/heavy metal multilayers.

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“…Therefore, the determination of the effective magnetic field and the parameters in the LLG equation, such as α and β, is an important issue for magnetization dynamics study. 12,14,15,20,21 Previously, we have derived the Gilbert damping (α) term based on the kinetic spin Bloch equation (KSBE) approach 22 in homogeneous ferromagnetic systems. 21 In the present work, we derive the whole LLG equation from the s-d model in inhomogeneous ferromagnetic systems based on the same approach.…”

Section: Introductionmentioning

confidence: 99%

“…20), and m = 0.5m e with m e representing the free electron mass, one estimates the spin stiffness A ss ∼ 1 pJ/m in GaMnAs. 26 However, the other effective field in the form −…”

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Existence of vertical spin stiffness in Landau-Lifshitz-Gilbert equation in ferromagnetic semiconductors

Shen

Tatara²,

Wu³

2011

Phys. Rev. B

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We calculate the magnetization torque due to the spin polarization of the itinerant electrons by deriving the kinetic spin Bloch equations based on the s-d model. We find that the first-order gradient of the magnetization inhomogeneity gives rise to the current-induced torques, which are consistent to the previous works. At the second-order gradient, we find an effective magnetic field perpendicular to the spin stiffness filed. This field is proportional to the nonadiabatic parameter β. We show that this vertical spin stiffness term can significantly modify the domain-wall structure in ferromagnetic semiconductors and hence should be included in the Landau-Lifshitz-Gilbert equation in studying the magnetization dynamics.

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Intrinsic Coupling between Current and Domain Wall Motion in (Ga,Mn)As

Cited by 42 publications

References 28 publications

Nanoscale magnetic heat pumps and engines

Nanoscale magnetic heat pumps and engines

Spin transfer and spin-orbit torques in in-plane magnetized (Ga,Mn)As tracks

Existence of vertical spin stiffness in Landau-Lifshitz-Gilbert equation in ferromagnetic semiconductors

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