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Room-temperature helimagnetism in FeGe thin films.

Zhang, S. L. and Stasinopoulos, I. and Lancaster, T. and Xiao, F. and Bauer, A. and Rucker, F. and Baker, A. A. and Figueroa, A. I. and Salman, Z. and Pratt, F. L. and Blundell, S. J. and Prokscha, T. and Suter, A. and Waizner, J. and Garst, M. and Grundler, D. and van der Laan, G. and Pfleiderer, C. and Hesjedal, T. (2017) 'Room-temperature helimagnetism in FeGe thin films.', Scientific reports., 7 (1). p. 123.


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 Dzyaloshinskii-Moriya 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 αintr = 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.

Item Type:Article
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Date accepted:14 February 2017
Date deposited:07 March 2017
Date of first online publication:09 March 2017
Date first made open access:No date available

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