Enhanced interfacial Dzyaloshinskii-Moriya interaction and isolated skyrmions in the inversion-symmetry-broken Ru/Co/W/Ru films

Samardak, Alexander and Kolesnikov, Alexander and Stebliy, Maksim and Chebotkevich, Ludmila and Sadovnikov, Alexandr and Nikitov, Sergei and Talapatra, Abhishek and Mohanty, Jyoti Ranjan and Ognev, Alexey (2018) Enhanced interfacial Dzyaloshinskii-Moriya interaction and isolated skyrmions in the inversion-symmetry-broken Ru/Co/W/Ru films. Applied Physics Letters, 112 (19). pp. 1-5. ISSN 0003-6951

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Abstract

An enhancement of the spin-orbit effects arising on an interface between a ferromagnet (FM) and a heavy metal (HM) is possible through the strong breaking of the structural inversion symmetry in the layered films. Here, we show that an introduction of an ultrathin W interlayer between Co and Ru in Ru/Co/Ru films enables to preserve perpendicular magnetic anisotropy (PMA) and simultaneously induce a large interfacial Dzyaloshinskii-Moriya interaction (iDMI). The study of the spin-wave propagation in the Damon-Eshbach geometry by Brillouin light scattering spectroscopy reveals the drastic increase in the iDMI value with the increase in W thickness (tW). The maximum iDMI of −3.1 erg/cm2 is observed for tW = 0.24 nm, which is 10 times larger than for the quasi-symmetrical Ru/Co/Ru films. We demonstrate the evidence of the spontaneous field-driven nucleation of isolated skyrmions supported by micromagnetic simulations. Magnetic force microscopy measurements reveal the existence of sub-100-nm skyrmions in the zero magnetic field. The ability to simultaneously control the strength of PMA and iDMI in quasi-symmetrical HM/FM/HM trilayer systems through the interface engineered inversion asymmetry at the nanoscale excites new fundamental and practical interest in ultrathin ferromagnets, which are a potential host for stable magnetic skyrmions.

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IITH Creators:
IITH CreatorsORCiD
Mohanty, Jyoti RanjanUNSPECIFIED
Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 15 May 2018 09:05
Last Modified: 15 May 2018 09:05
URI: http://raiith.iith.ac.in/id/eprint/3925
Publisher URL: http://doi.org/10.1063/1.5029857
OA policy: http://www.sherpa.ac.uk/romeo/issn/0003-6951/
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