Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session F10: Invited Session: Spin-Orbit Transfer Torques in Magnetic Bilayers
8:00 AM–11:00 AM,
Tuesday, March 19, 2013
Sponsoring Unit: GMAG
Chair: Kyung-Jin Lee, Korea University
Abstract ID: BAPS.2013.MAR.F10.3
Abstract: F10.00003 : Rashba spin-orbit coupling and orbital chirality in magnetic bilayers*
9:12 AM–9:48 AM
Preview Abstract Abstract
(Department of Physics, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Korea)
The phenomenon of the Rashba spin-orbit coupling is examined theoretically for an ultrathin magnetic layer in contact with a non-magnetic heavy metal layer. From first-principles calculation, large Rashba parameter of order 1 eV$\cdot$\AA\ is obtained, which is strong enough to generate large spin transfer torque of spin-orbit coupling origin. Large Rashba parameter is attributed to the orbital mixing of 3$d$ magnetic atoms and non-magnetic heavy elements with significant atomic spin-orbit coupling. Interestingly the magnitude and sign of the parameter vary from energy bands to bands, which we attribute to band-specific chiral ordering of orbital angular momentum. Through a simple tight-binding model analysis, we demonstrate that $d$-orbital hybridization allowed by the breaking of structural inversion symmetry generates band-specific chiral ordering of orbital angular momentum, which combines with atomic spin-orbit coupling to give rise to band-specific Rashba parameter. The band-dependence of the Rashba parameter is discussed in connection with recent experiments and we argue that the dependence may be utilized to enhance device application potentials.
*This work is supported by NRF grant (2010-0008529, 2011-0015631, 2010-0014109, 2011-0030789).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.F10.3
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