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Spin reorientation in the Er2-xFe14+2xSi3
single-crystal studied by Mössbauer spectroscopy
J. Żukrowski 1, A. Błachowski 2, K. Ruebenbauer 2, J. Przewoźnik 1,D. Sitko 3, N.-T.H. Kim-Ngan 3, Z. Tarnawski 1, A.V. Andreev 4
1 Solid State Physics Department, Faculty of Physics and Applied Computer Science,
AGH University of Science and Technology, Kraków, Poland
2 Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, Kraków, Poland
3 Surface Physics Division, Institute of Physics, Pedagogical University, Kraków, Poland
4 Institute of Physics, Academy of Sciences, Prague, Czech Republic
Bulk magnetic moment versus temperature in the moderate external field 0.1 T aligned along the c-axis
Er2-xFe14+2xSi3 single-crystal
Magnetic susceptibility versus temperature for various AC frequencies in the null external field and for the moderate external field 0.1 T applied along the c-axis.
The AC field was applied along the c-axis.
Er2-xFe14+2xSi3
111112
1 g 002
1 21 2
acos and )(sin2)(cos 1
11111
11111
00
20
211111 g
gg
K. Ruebenbauer, Physica B 172, 346 (1991)
Er2-xFe14+2xSi3 powder sample
verage angle between c-axis and
iron hyperfine fields
0.5
Er2-xFe14+2xSi3 single-crystal
4f
6g
12j or 12k
12k or 12j
2b 4e
Contribution from iron atoms with hyperfine field perpendicular to c-axis
C
ontr
ibut
ion
(at.
% F
e)
Er2-xFe14+2xSi3
Conclusions
Spin reorientation from the [a - b] plane onto the c-axis occurs for all iron sub-lattices except for iron dumbbells substituting erbium (2b)
in the temperature range 130 – 80 K due to the domain flip mechanism.
Spin reorientation is less perfect for the sub-lattices (12j) and (12k) containing silicon.
Gradual second spin reorientation occurs below 50 K leading to the partial recovery of the high temperature spin structure.