Magnetic relaxation phenomena in the chiral magnet Fe1−xCoxSi

An ac susceptibility study

Journal article (2016)

Authors

L.J. Bannenberg RST/Neutron and Positron Methods in Materials - AS
A.J.E. Lefering RST/Fundamental Aspects of Materials and Energy - AS
K. Kakurai RIKEN Center for Emergent Matter Science (CEMS), CROSS Tokai
Y Onose University of Tokyo
Y. Endoh RIKEN Center for Emergent Matter Science (CEMS)
Y Tokura University of Tokyo, RIKEN Center for Emergent Matter Science (CEMS)
C. Pappas RST/Neutron and Positron Methods in Materials - AS
Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
Copyright: © 2016 L.J. Bannenberg, A.J.E. Lefering, K. Kakurai, Y Onose, Y. Endoh, Y Tokura, C. Pappas
DOI: https://doi.org/10.1103/PhysRevB.94.134433
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Published Date

31-10-2016

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

Abstract

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.

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