Author:
Lin Jun-Fa,Wang Huan,Xu Sheng,Wang Xiao-Yan,Zeng Xiang-Yu,Dai Zheng-Yi,Gong Jing,Han Kun,Wang Yi-Ting,Ma Xiao-Ping,Xia Tian-Long
Abstract
Abstract
High-Curie-temperature ferromagnets are promising candidates for designing new spintronic devices. Here we have successfully synthesized the single crystal of the itinerant ferromagnet Mn5Ge3 using flux method. Its critical properties were investigated by means of bulk dc magnetization at the boundary of the paramagnetic (PM) and ferromagnetic (FM) phase to determine intrinsic magnetic interactions. Critical exponents
with a critical temperature
K and
with
K are acquired by the modified Arrott plot, whereas
is deduced by a critical isotherm analysis at
K. The self-consistency and reliability of these critical exponents are verified by the Widom scaling law and the scaling equations. Further analysis reveals that the spin interaction in Mn5Ge3 exhibits three-dimensional Ising-like behavior. The magnetic exchange interaction is found to decay as
, meaning that the spin interactions exceed the nearest neighbors, which may be related to the different Mn-Mn interactions with inequal exchange strengths.
Funder
the National Natural Science Foundation of China
the Research Funds of Renmin University of China
the National Key R & D Program of China