TY - JOUR
T1 - Magnetic relaxation phenomena in the chiral magnet Fe1−xCoxSi
T2 - An ac susceptibility study
AU - Bannenberg, Lars
AU - Lefering, Anton
AU - Kakurai, K.
AU - Onose, Y
AU - Endoh, Y.
AU - Tokura, Y
AU - Pappas, Catherine
PY - 2016/10/31
Y1 - 2016/10/31
N2 - 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.
AB - 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.
UR - http://resolver.tudelft.nl/uuid:09a2eb72-d8c1-4e45-beb6-e849d8f8a18d
U2 - 10.1103/PhysRevB.94.134433
DO - 10.1103/PhysRevB.94.134433
M3 - Article
SN - 1098-0121
VL - 94
JO - Physical Review B (Condensed Matter and Materials Physics)
JF - Physical Review B (Condensed Matter and Materials Physics)
IS - 13
M1 - 134433
ER -