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X-RAY DIFFUSE SCATTERINGS IN A Fe-Pt INVAR ALLOY
F. Ono,H. Maeta,L. Bang 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Measurements of X-ray diffuse scatterings were made in disordered single crystal of Fe-28.3at%Pt Invar alloy around a 200-Bragg peak in a wide temperature range between 15 K and 300 K. Observed diffuse scatterings were almost spherical, suggesting a homogeneous disordered alloy. However, the q-dependence of the observed thermal diffuse scattering was different from the usual type, indicating a possibility of existence of local distortion of lattice accompanied by a large gradient of stress.
PRESSURE DEPENDENCE OF THE CURIE TEMPERATURE IN MnAlGe
S. Endo,H. Matsuzaki,F. Ono,T. Kanomata,T. Kaneko 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The pressure dependence of the Curie temperature was determined in 2dimensional like ferromagnet, MnAlGe up to a maximum pressure of 7.5 ㎬ through measurements of electric resistance vs temperature curves. The pressure coefficient was positive with a considerably high rate of 9 K/㎬ in the low pressure ragion, while it decreased gradually down to one order of magnitude smaller value at the maximum pressure. It was concluded that ther is an upper limit of about 550 K in the super-exchange type ferromagnetic interaction between Mn layers.