Magnetic relaxation phenomena in the chiral magnet Fe1-xCoxSi: An ac susceptibility study

L. J. Bannenberg, A. J.E. Lefering, K. Kakurai, Y. Onose, Y. Endoh, Y. Tokura, C. Pappas

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28 Citations (Scopus)


We present a systematic study of the ac susceptibility of the chiral magnet Fe1-xCoxSi with x=0.30 covering four orders of magnitude in frequencies from 0.1 Hz to 1 kHz, with particular emphasis to the pronounced history dependence. Characteristic relaxation times ranging from a few milliseconds to tens of seconds are observed around the skyrmion lattice A phase, the helical-to-conical transition and in a region above TC. The distribution of relaxation frequencies around the A phase is broad, asymmetric, and originates from multiple coexisting relaxation processes. The pronounced dependence of the magnetic phase diagram on the magnetic history and cooling rates as well as the asymmetric frequency dependence and slow dynamics suggest more complicated physical phenomena in Fe0.7Co0.3Si than in other chiral magnets.

Original languageEnglish
Article number134433
JournalPhysical Review B
Issue number13
Publication statusPublished - 2016 Oct 31
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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