Publication detail

Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes

VAŇATKA, M. ROJAS-SÁNCHEZ, J. VOGEL, J. BONFIM, M. BELMEGUENAI, M. ROUSSIGNÉ, Y. STACHKEVITCH, A. THIAVILLE, A. PIZZINI, S.

Czech title

Asymetrie rychlosti Dzyaloshinskeho doménových stěn v režimu tečení a kreepu.

English title

Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes

Type

journal article in Web of Science

Language

en

Original abstract

We have carried out measurements of domain wall dynamics in a Pt/Co/GdOx(t) wedge sample with perpendicular magnetic anisotropy. When driven by an easy-axis field Hz in the presence of an in-plane field Hx, the domain wall propagation is different along ±x, as expected for samples presenting Dzyaloshinskii–Moriya (DMI) interaction. In the creep regime, the sign and the value of the domain wall velocity asymmetry changes along the wedge. We show that in our samples the domain wall speed versus Hx curves in the creep regime cannot be explained simply in terms of the variation of the domain wall energy with Hx, as suggested by previous works. For this reason the strength and the sign of the DMI cannot be extracted from these measurements. To obtain reliable information on the DMI strength using magnetic field-induced domain wall dynamics, measurements have been performed with high fields, bringing the DW close to the flow regime of propagation. In this case we find large values of the DMI, consistent in magnitude and sign with those obtained from Brillouin light scattering measurements.

Czech abstract

Publikace se věnuje asymetrieï rychlosti Dzyaloshinskeho doménových stěn v režimech tečení a kreepu.

English abstract

We have carried out measurements of domain wall dynamics in a Pt/Co/GdOx(t) wedge sample with perpendicular magnetic anisotropy. When driven by an easy-axis field Hz in the presence of an in-plane field Hx, the domain wall propagation is different along ±x, as expected for samples presenting Dzyaloshinskii–Moriya (DMI) interaction. In the creep regime, the sign and the value of the domain wall velocity asymmetry changes along the wedge. We show that in our samples the domain wall speed versus Hx curves in the creep regime cannot be explained simply in terms of the variation of the domain wall energy with Hx, as suggested by previous works. For this reason the strength and the sign of the DMI cannot be extracted from these measurements. To obtain reliable information on the DMI strength using magnetic field-induced domain wall dynamics, measurements have been performed with high fields, bringing the DW close to the flow regime of propagation. In this case we find large values of the DMI, consistent in magnitude and sign with those obtained from Brillouin light scattering measurements.

Keywords in Czech

Doménové stěny; Dynamika doménových stěn; Interakce Dzyaloshinskieho–Moriyi; Spin–orbitální moment; Magnetické nanostruktury

Keywords in English

Domain walls; Domain wall dynamics; Dzyaloshinskii–Moriya interaction; Spin–orbit torques; Magnetic nanostructures

RIV year

2015

Released

27.07.2015

ISSN

0953-8984

Volume

27

Number

32

Pages from–to

326002-1–326002-8

Pages count

8

BIBTEX


@article{BUT116855,
  author="Marek {Vaňatka} and Jan {Čechal} and Juan-Carlos {Rojas-Sánchez} and Jan {Vogel} and Marlio {Bonfim} and Mohamed {Belmeguenai} and Yves {Roussigné} and Andrei {Stachkevitch} and André {Thiaville} and Stefania {Pizzini},
  title="Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes",
  year="2015",
  volume="27",
  number="32",
  month="July",
  pages="326002-1--326002-8",
  issn="0953-8984"
}