Magnetization Dynamics and Spinsupercurrents in Superconductingand Multiferroic Systems
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- Institutt for fysikk 
This thesis presents the research findings from three articles which have been published or submitted for publication. In the first article, we study the magnetization dynamics and anomalous supercurrent that can arise in a textured magnetic Josephson junction. We show that supercurrent-induced magnetization switching is possible and that for special magnetic configurations, a supercurrent can flow even at zero phase difference. In the second article, we study domain wall motion induced by current and spin-waves in multiferroic systems. We demonstrate that it is possible to exert electric control over domain-wall motion in such systems and that one can create magnonic torques even on homogeneous magnetic order parameters. In the third article, we prove that it is possible to obtain a long-ranged triplet supercurrent when using only one single homogeneous magnetic layer, in contrast to previous works in the literature. This is made possible by depositing thin heavy normal metal layers at the superconducting interfaces which induce Rashba spin-orbit coupling. We show that the spin supercurrent arising in this way has several unusual properties, including that it does not decay spatially even in the presence of magnetic impurities and that its polarization direction can be tuned via the superconducting phase difference.
Has partsPaper 1: Kulagina, Iryna; Linder, Jacob. Spin supercurrent, magnetization dynamics, and φ -state in spin-textured Josephson junctions. Physical Review B. Condensed Matter and Materials Physics 2014 ;Volum 90.(5) http://dx.doi.org/10.1103/PhysRevB.90.054504 ©2014 American Physical Society
Paper 2: Kulagina and J. Linder. Electric-field control over spin-wave and current induced domain wall motion and magnonic torques in multiferroics. Submitted to Physical Review Letters (arXiv:1411.3327)
Paper 3: S. Jacobsen, I. Kulagina, and J. Linder. Controlling superconducting spin-flow with spin-flip immunity using a single homogeneous ferromagnetic layer. Submitted to Physical Review Letters (arXiv:1510.02488)