Magnetic relaxation phenomena in the chiral magnet Fe1−xCoxSi

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

Bannenberg, L.J. (TU Delft RST/Neutron and Positron Methods in Materials)
Lefering, A.J.E. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Kakurai, K. (RIKEN Center for Emergent Matter Science (CEMS); CROSS Tokai)
Onose, Y (University of Tokyo)
Endoh, Y. (RIKEN Center for Emergent Matter Science (CEMS))
Tokura, Y (RIKEN Center for Emergent Matter Science (CEMS); University of Tokyo)
Pappas, C. (TU Delft RST/Neutron and Positron Methods in Materials)

2016-10-31

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.

http://resolver.tudelft.nl/uuid:09a2eb72-d8c1-4e45-beb6-e849d8f8a18d

https://doi.org/10.1103/PhysRevB.94.134433

1098-0121

Physical Review B (Condensed Matter and Materials Physics), 94 (13)

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journal article

© 2016 L.J. Bannenberg, A.J.E. Lefering, K. Kakurai, Y Onose, Y. Endoh, Y Tokura, C. Pappas