Dresden 2017 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 8: Ferroics - Domains, Domain Walls and Skyrmions I
DF 8.3: Talk
Tuesday, March 21, 2017, 10:15–10:30, WIL B321
Giant Rashba effect in ferroelectrics from first principles — •Louis Ponet1,2, Urko Petralanda1, Silvia Picozzi3, and Sergey Artyukhin1 — 1Quantum Materials Theory, Istituto Italiano di Tecnologia, Via Morego, 30, Genova, Italy. — 2Scuola Normale Superiore, Piazza dei Cavalieri, 7, Pisa — 3CNR-SPIN, UOS L’Aquila, Via Vetoio, 10, Coppito, L’Aquila (IT)
Spintronics has been an exciting area in the last decades, due to a promise for devices that exploit the existence of spin-polarized states [1]. Important applications include storage media, where the use of spins to store data has been widespread since the earliest days of computing. However, these storage devices use magnetic fields to orient magnetic domains, an approach that is making further miniaturization increasingly difficult. A possible solution could be using spin torques provided by spin-polarized currents for more fine-grained and efficient control of magnetic domains. However, to access these states in electronics, there is also a pressing need for electric control of the states, which was recently demonstrated in materials that showcase an anomalously large Rashba-effect [2]. This effect allows for electric control of very highly spin-polarized states, but the origin of the behaviour is not thoroughly understood yet. We used model Hamiltonians and ab-initio calculations to examine the effect.
[1] S. D. Bader and S. S. P. Parkin, Spintronics, Ann. Rev. Cond. Matt. Phys. 1, 71 (2010).
[2] D. Di Sante, P. Barone, R. Bertacco, S. Picozzi, Advanced Materials, 25, 509 (2013).