Fluctuation-induced Neel and Bloch skyrmions at topological insulator surfaces

Download

index.pdf

Date

2018-08-03

Author

Nogueira, Flavio S.
Eremin, Ilya
Katmis, Ferhat
Moodera, Jagadeesh S.
van den Brink, Jeroen
Kravchuk, Volodymyr P.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

133
views

110
downloads

Ferromagnets in contact with a topological insulator have become appealing candidates for spintronics due to the presence of Dirac surface states with spin-momentum locking. Because of this, bilayer Bi2Se3-EuS structures, for instance, show a finite magnetization at the interface at temperatures well exceeding the Curie temperature of bulk EuS. Here, we determine theoretically the effective magnetic interactions at a topological insulator-ferromagnet interface above themagnetic ordering temperature. We show that by integrating out the Dirac fermion fluctuations an effective Dzyaloshinskii-Moriya interaction and magnetic charging interaction emerge. As a result, individual magnetic skyrmions and extended skyrmion lattices can form at the interfaces of ferromagnets and topological insulators, the first indications of which have been very recently observed experimentally.

Subject Keywords

Temperature magnetic skyrmions, Magnon modes, Ferromagnets, Dynamics, States

URI

https://hdl.handle.net/11511/68363

Journal

PHYSICAL REVIEW B

DOI

https://doi.org/10.1103/physrevb.98.060401

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Energy spectrum of a 2D Dirac oscillator in the presence of a constant magnetic field and an antidot potential Akçay, Hüseyin; Sever, Ramazan (2016-07-04) We investigate the energy spectrum and the corresponding eigenfunctions of a 2D Dirac oscillator confined by an antidot potential in the presence of a magnetic field and Aharonov-Bohm flux field. Analytical solutions are obtained and compared with the results of the Schrodinger equation found in the literature. Further, the dependence of the spectrum on the magnetic quantum number and on the repulsive potential is discussed.
Magnetic Resonance Signal Analysis in Inhomogenous Magnetic Fields Arpinar, V. E.; Eyüboğlu, Behçet Murat (2009-09-12) Nuclear Magnetic Resonance (NMR) systems with inhomogenous main magnetic fields have been satisfactorily used to explore material properties. So that, imaging of biological tissues using Magnetic Resonance Imaging (MRI) systems with inhomogenous main magnetic fields could be explored. In this work, magnetic resonance (MR) signal deviation due to inhomogeneity in the main magnetic field of a MRI system is investigated. This analysis gives the understanding of the effect of inhomogeneity in magnetic field to ...
Magnetic properties of multiband U=infinity Hubbard model on anisotropic triangular and rectangular lattice strips CHERANOVSKII, VO; Esentürk, Okan; PAMUK, HO (1998-11-01) We study the dependence of the ground state spin of a multiband Hubbard model with infinite electron repulsion on anisotropic triangular and rectangular lattice strips on the model parameters. Considering the results of numerical calculations for the exact spectra of finite triangular lattice strips at different values of hopping integrals, we show the existence of a type of magnetic transitions with the jump of the ground state spin between minimal and maximal values. This transition is found only for spec...
Multinucleon transfer in central collisions of U-238+U-238 Ayik, S.; YILMAZ, BÜLENT; YILMAZ TÜZÜN, ÖZGÜL; Umar, A. S.; Turan, Gürsevil (2017-08-14) Quantal diffusion mechanism of nucleon exchange is studied in the central collisions of U-238 + U-238 in the framework of the stochastic mean-field (SMF) approach. For bombarding energies considered in this work, the dinuclear structure is maintained during the collision. Hence, it is possible to describe nucleon exchange as a diffusion process for mass and charge asymmetry. Quantal neutron and proton diffusion coefficients, including memory effects, are extracted from the SMF approach and the primary fragm...
Magnetic activity and evolution of Algol-type stars - II SARNA, MAREK; Yerli, Sinan Kaan; Muslimov, A G (1998-07-01) We examine the possibility of probing dynamo action in mass-losing stars, components of Algol-type binaries, Our analysis is based on the calculation of nonconservative evolution of these systems, We model the systems U Sge and beta Per where the more massive companion fills its Roche lobe at the main sequence (case AB) and where it has a small helium core (early case B) respectively, We show that to maintain evolution of these systems at the late stages which are presumably driven by stellar 'magnetic brak...

Citation Formats

F. S. Nogueira, I. Eremin, F. Katmis, J. S. Moodera, J. van den Brink, and V. P. Kravchuk, “Fluctuation-induced Neel and Bloch skyrmions at topological insulator surfaces,” PHYSICAL REVIEW B, pp. 0–0, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68363.