TY - JOUR
T1 - Spin-glass behaviour, thermal expansion anomaly and spin fluctuations in Y20(Mn1-xFex)80 amorphous alloys
AU - Ohta, M.
AU - Fujita, Asaya
AU - Fukamichi, K.
AU - Obi, Y.
AU - Fujimori, H.
PY - 1999/5/24
Y1 - 1999/5/24
N2 - The spin-glass behaviour and the thermal expansion anomaly in annealed Y20(Mn1-xFex)80 amorphous alloys have been investigated. The spin freezing temperature Tg shows a minimum at around x = 0.50, consistent with the theoretical investigation. The sign of the paramagnetic Curie temperature θp indicates that the average exchange interaction is antiferromagnetic in the Mn-rich concentration region and gradually becomes ferromagnetic with increasing x. The minimum of Tg occurs at the concentration where the sign of θp changes. The spontaneous volume magnetostriction is negligibly small in the Mn-rich concentration region and becomes larger with increasing x. These results are explained by the change in the spin fluctuation characteristics. In the Fe-rich concentration region, the thermal expansion anomaly takes place even in the paramagnetic temperature range due to the single-site spin fluctuation.
AB - The spin-glass behaviour and the thermal expansion anomaly in annealed Y20(Mn1-xFex)80 amorphous alloys have been investigated. The spin freezing temperature Tg shows a minimum at around x = 0.50, consistent with the theoretical investigation. The sign of the paramagnetic Curie temperature θp indicates that the average exchange interaction is antiferromagnetic in the Mn-rich concentration region and gradually becomes ferromagnetic with increasing x. The minimum of Tg occurs at the concentration where the sign of θp changes. The spontaneous volume magnetostriction is negligibly small in the Mn-rich concentration region and becomes larger with increasing x. These results are explained by the change in the spin fluctuation characteristics. In the Fe-rich concentration region, the thermal expansion anomaly takes place even in the paramagnetic temperature range due to the single-site spin fluctuation.
UR - http://www.scopus.com/inward/record.url?scp=0004408530&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0004408530&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/11/20/312
DO - 10.1088/0953-8984/11/20/312
M3 - Article
AN - SCOPUS:0004408530
VL - 11
SP - 4053
EP - 4062
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 20
ER -