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RESEARCH PRODUCT
Minimal Model of Spin-Transfer Torque and Spin Pumping Caused by the Spin Hall Effect
Manfred SigristJairo SinovaWei ChenWei ChenDirk Manskesubject
PhysicsSpin pumpingCondensed matter physicsSpin polarizationCondensed Matter - Mesoscale and Nanoscale PhysicsSpin-transfer torqueFOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnologyCoupling (probability)Condensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesQuantum spin Hall effectQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesSpin Hall effectCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologyWave functionQuantum tunnellingdescription
In the normal metal/ferromagnetic insulator bilayer (such as Pt/Y$_{3}$Fe$_{5}$O$_{12}$) and the normal metal/ferromagnetic metal/oxide trilayer (such as Pt/Co/AlO$_{x}$) where spin injection and ejection are achieved by the spin Hall effect in the normal metal, we propose a minimal model based on quantum tunneling of spins to explain the spin-transfer torque and spin pumping caused by the spin Hall effect. The ratio of their damping-like to field-like component depends on the tunneling wave function that is strongly influenced by generic material properties such as interface $s-d$ coupling, insulating gap, and layer thickness, yet the spin relaxation plays a minor role. The quantified result renders our minimal model an inexpensive tool for searching for appropriate materials.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-07-23 | PHYSICAL REVIEW LETTERS |