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# Theory of laser-induced ultrafast superdiffusive spin transport in layered heterostructures

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Physical Review B

American Physical Society (APS)

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### Most cited references67

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### Anomalous diffusion in disordered media: Statistical mechanisms, models and physical applications

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### Enhanced Gilbert Damping in Thin Ferromagnetic Films

(2001)
Using a scattering matrix approach, the precession of the magnetization of a ferromagnet is shown to transfer spins into adjacent normal metal layers. This pumping'' of spins slows down the precession corresponding to an enhanced Gilbert damping factor in the Landau-Lifshitz equation. The damping is expressed in terms of the scattering matrix of the ferromagnet-normal metal interface, which is accessible to model and first-principles calculations. Our estimates for permalloy thin films explain the trends observed in recent experiments.
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### Nonlocal magnetization dynamics in ferromagnetic heterostructures

(2004)
Two complementary effects modify the GHz magnetization dynamics of nanoscale heterostructures of ferromagnetic and normal materials relative to those of the isolated magnetic constituents: On the one hand, a time-dependent ferromagnetic magnetization pumps a spin angular-momentum flow into adjacent materials and, on the other hand, spin angular momentum is transferred between ferromagnets by an applied bias, causing mutual torques on the magnetizations. These phenomena are manifestly nonlocal: they are governed by the entire spin-coherent region that is limited in size by spin-flip relaxation processes. We review recent progress in understanding the magnetization dynamics in ferromagnetic heterostructures from first principles, focusing on the role of spin pumping in layered structures. The main body of the theory is semiclassical and based on a mean-field Stoner or spin-density--functional picture, but quantum-size effects and the role of electron-electron correlations are also discussed. A growing number of experiments support the theoretical predictions. The formalism should be useful to understand the physics and to engineer the characteristics of small devices such as magnetic random-access memory elements.
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### Author and article information

###### Journal
PRBMDO
Physical Review B
Phys. Rev. B
American Physical Society (APS)
1098-0121
1550-235X
July 2012
July 5 2012
: 86
: 2
###### Article
10.1103/PhysRevB.86.024404