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Magnetization Dynamics and Spinsupercurrents in Superconductingand Multiferroic Systems

Kulagina, Iryna
Doctoral thesis
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http://hdl.handle.net/11250/2375271
Utgivelsesdato
2016
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  • Institutt for fysikk [1751]
Sammendrag
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.
Består av
Paper 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)
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NTNU
Serie
Doctoral thesis at NTNU;2016:5

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