TY - JOUR
T1 - Laser-induced magnetization dynamics of lanthanide-doped permalloy thin films
AU - Radu, I.
AU - Woltersdorf, G.
AU - Kiessling, M.
AU - Melnikov, A.
AU - Bovensiepen, U.
AU - Thiele, J. U.
AU - Back, C. H.
PY - 2009/3/19
Y1 - 2009/3/19
N2 - We investigate the effect of Ho, Dy, Tb, and Gd impurities on the femtosecond laser-induced magnetization dynamics of thin Permalloy films using the time-resolved magneto-optical Kerr effect. Varying the amount of Ho, Dy, Tb content from 0% to 8%, we observe a gradual change of the characteristic demagnetization time constant from 60 to 150fs. In contrast, Gd concentrations up to 15% do not influence the time scale of the initial photoinduced magnetization loss. We propose a demagnetization mechanism that relies on strong magnetic inertia of the rare-earth dopant which stabilizes the ferrimagnetic ordering and thereby delays the demagnetization.
AB - We investigate the effect of Ho, Dy, Tb, and Gd impurities on the femtosecond laser-induced magnetization dynamics of thin Permalloy films using the time-resolved magneto-optical Kerr effect. Varying the amount of Ho, Dy, Tb content from 0% to 8%, we observe a gradual change of the characteristic demagnetization time constant from 60 to 150fs. In contrast, Gd concentrations up to 15% do not influence the time scale of the initial photoinduced magnetization loss. We propose a demagnetization mechanism that relies on strong magnetic inertia of the rare-earth dopant which stabilizes the ferrimagnetic ordering and thereby delays the demagnetization.
UR - http://www.scopus.com/inward/record.url?scp=63549124117&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.102.117201
DO - 10.1103/PhysRevLett.102.117201
M3 - Article
AN - SCOPUS:63549124117
SN - 0031-9007
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
M1 - 117201
ER -