Roles of nonequilibrium conduction electrons on the magnetization dynamics of ferromagnets.

By Shufeng Zhang, Z. Li. Physical Review Letters, 2004

1,060 citations recorded by the source corpus.

The mutual dependence of spin-dependent conduction and magnetization dynamics of ferromagnets provides the key mechanisms in various spin-dependent phenomena. We compute the response of the conduction electron spins in a spatial and time varying magnetization M(r,t) in the time-dependent semiclassical transport theory. We show that the induced nonequilibrium conduction spin density in turn generates four spin torques acting on the magnetization-with each torque playing a different role in magnetization dynamics. By comparing with recent theoretical models, we find that one of these torques which has not been previously identified is crucial to consistently interpreting experimental data on domain wall motion.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/d2981510807f763b4deb3c0d5a573bc82a55b936

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

In Condensed Matter Physics

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Spin-dependent phenomena and device concepts explored in (Ga,Mn)As (2013, methodology): “Current induced spin-transfer torque In this section we focus on the current-induced STT studies in (Ga,Mn)As.”
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “The same breakdown is therefore also expected when the effective field BT is along the domains’ magnetization and large enough [with the subtleties that for STT, the velocity increases above the threshold when β < α (Thiaville et al., 2005; Zhang and Li, 2004), while”
Dilute ferromagnetic semiconductors: Physics and spintronic structures (2013, background): “, 2009) interpreted their data assigning non-zero values of jc to extrinsic DW pinning and allowing for a large magnitude of the non-adiabatic spin torque (present due to spin-orbit interactions), βw/αG & 1 (Garate et al., 2009; Hals et al., 2009; Zhang and Li, 2004).”
Skyrmions in magnetic multilayers (2017, background): “In a metallic skyrmion material, an applied electric current generates STT between conduction electrons and local magnetic moments due to the exchange of spin angular momenta between them [22, 23].”
Interface-Induced Phenomena in Magnetism (2016, neutral): “3 and "conventional" spin-transfer torques due to spin currents flowing through spatially varying magnetizations [Berger, 1984; Zhang and Li, 2004; Beach et al., 2008; Tserkovnyak et al., 2008].”
Spin-polarised currents and magnetic domain walls (2005, background): “) This difference was ascribed to either the need to treat non-adiabatic effects [438] or take account of edge roughness [439, 440].”
Beyond skyrmions: Review and perspectives of alternative magnetic quasiparticles (2020, background): “One typically discusses two scenarios: the motion under spin-transfer torque (STT) [98], where a spin-polarized current goes through the spin texture and reorients the magnetic moments of a skyrmion (Fig.”