TY - JOUR
T1 - Spin glass behaviour of amorphous Ge-Mn alloy thin films
AU - Song, S. H.
AU - Jung, M. H.
AU - Lim, S. H.
PY - 2007/1/24
Y1 - 2007/1/24
N2 - Magnetic measurements are performed under ac and dc conditions on well characterized Ge100-xMnx (x in at.%) amorphous thin films prepared by thermal co-evaporation onto oxidized Si or glass substrates at room temperature. M-H hysteresis loops at 5K show that saturation does not occur even at a high applied field of 30 or 50kOe. The temperature dependence of the dc and ac susceptibility shows a cusp with a position and magnitude that vary with the frequency during the ac susceptibility measurements. These results suggest a spin glass behaviour at low temperatures. Two competing magnetic interactions between Mn ions, which are responsible for the spin glass behaviour, are considered to be the direct antiferromagnetic coupling and the indirect ferromagnetic coupling through conduction electrons or holes. Scaling analysis indicates that the indirect ferromagnetic interactions are long range.
AB - Magnetic measurements are performed under ac and dc conditions on well characterized Ge100-xMnx (x in at.%) amorphous thin films prepared by thermal co-evaporation onto oxidized Si or glass substrates at room temperature. M-H hysteresis loops at 5K show that saturation does not occur even at a high applied field of 30 or 50kOe. The temperature dependence of the dc and ac susceptibility shows a cusp with a position and magnitude that vary with the frequency during the ac susceptibility measurements. These results suggest a spin glass behaviour at low temperatures. Two competing magnetic interactions between Mn ions, which are responsible for the spin glass behaviour, are considered to be the direct antiferromagnetic coupling and the indirect ferromagnetic coupling through conduction electrons or holes. Scaling analysis indicates that the indirect ferromagnetic interactions are long range.
UR - http://www.scopus.com/inward/record.url?scp=33947594724&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33947594724&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/19/3/036211
DO - 10.1088/0953-8984/19/3/036211
M3 - Article
AN - SCOPUS:33947594724
SN - 0953-8984
VL - 19
JO - Journal of physics. Condensed matter : an Institute of Physics journal
JF - Journal of physics. Condensed matter : an Institute of Physics journal
IS - 3
M1 - 036211
ER -