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research article

Room-temperature helimagnetism in FeGe thin films

Zhang, S. L.
•
Stasinopoulos, I.
•
Lancaster, T.
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2017
Scientific Reports

Chiral magnets are promising materials for the realisation of high-density and low-power spintronic memory devices. For these future applications, a key requirement is the synthesis of appropriate materials in the form of thin films ordering well above room temperature. Driven by the DzyaloshinskiiMoriya interaction, the cubic compound FeGe exhibits helimagnetism with a relatively high transition temperature of 278 K in bulk crystals. We demonstrate that this temperature can be enhanced significantly in thin films. Using x-ray scattering and ferromagnetic resonance techniques, we provide unambiguous experimental evidence for long-wavelength helimagnetic order at room temperature and magnetic properties similar to the bulk material. We obtain alpha(intr) = 0.0036 +/- 0.0003 at 310 K for the intrinsic damping parameter. We probe the dynamics of the system by means of muon-spin rotation, indicating that the ground state is reached via a freezing out of slow dynamics. Our work paves the way towards the fabrication of thin films of chiral magnets that host certain spin whirls, so-called skyrmions, at room temperature and potentially offer integrability into modern electronics.

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Type
research article
DOI
10.1038/s41598-017-00201-z
Web of Science ID

WOS:000396868900005

Author(s)
Zhang, S. L.
Stasinopoulos, I.
Lancaster, T.
Xiao, F.
Bauer, A.
Rucker, F.
Baker, A. A.
Figueroa, A. I.
Salman, Z.
Pratt, F. L.
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Date Issued

2017

Publisher

Nature Research

Published in
Scientific Reports
Volume

7

Start page

123

Subjects

skyrmion

•

ferromagnetic resonance

•

chiral magnet

•

helimagnet

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMGN  
Available on Infoscience
May 1, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/136840
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