Nonlocal magnetization dynamics in ferromagnetic heterostructures

By Y. Tserkovnyak, A. Brataas, G. Bauer, B. Halperin. 2004

944 citations recorded by the source corpus.

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. This review presents 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 for understanding the physics and for engineering the characteristics of small devices such as magnetic random-access memory elements.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics

View Paper: https://www.semanticscholar.org/paper/5d2265eb39170faea81e5a250232612375c406cc

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Axel Hoffmann
2. A. Manchon
3. T. Jungwirth
4. Y. Tserkovnyak
5. J. Shibata
6. Eiji Saitoh
7. H. Kohno
8. A. Brataas

In Condensed Matter Physics

1. Axel Hoffmann
2. T. Jungwirth
3. Y. Tserkovnyak
4. A. Brataas
5. A. Manchon
6. B. V. van Wees
7. M. Silaev
8. Pauli Virtanen

Citations in the corpus

• Spin-dependent phenomena and device concepts explored in (Ga,Mn)As (2013, background): “A reciprocal effect to the STT is the spin-pumping phenomenon in which pure spin-current is generated from magnetization precession (Mizukami et al., 2001; Tserkovnyak et al., 2005).”
• Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field (2017, background): “ics and its coupling to the electronic degrees of freedom via the reciprocal effects of spin transfer torque and spin pumping (Tserkovnyak et al., 2005) in the farfrom equilibrium regime to lead to completely new type of physics, as the two types of order parameters affect each other.”
• Thermally driven spin injection from a ferromagnet into a non-magnetic metal (2010, positive): “sparked the interest of the community in spin-dependent conductivity and new spin electronics that still exists toda”
• Conduction of spin currents through insulating antiferromagnetic oxides (2013, background): “[14] Tserkovnyak, Y.”
• Magnetization oscillations and waves driven by pure spin currents (2016, background): “This indicates that a new relaxation channel has been opened up where angular momentum can escape through the interface and get absorbed in the metal through the so-called spin pumping effect [146].”