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Magnetic Order in YbMn2Si2 - Neutron Scattering Investigation
S. J. Campbell,M. Hofmann,R. A. Mole,K. Prokes,D. Wallacher,J. L. Wang 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Several mechanisms have been proposed to account for the structural and magnetic behaviour ofthe rare earth intermetallic compound YbMn2Si2 below the transition that occurs around 30 K. We have carried out detailed neutron diffraction measurements over the temperature range 0.3 -52 K and confirm both an antiferromagnetic structure with ferromagnetic Mn (001) planes coupledantiferromagnetically along the c-axis above 30 K and the absence of ordering of the Yb sublatticedown to 0.3 K. The decrease in intensity of the (111) reflection around 30 K together with theappearance of satellite reflections of propagation vector k = 00 12 confirm that the magnetic unitcell doubles along the c axis below TN2. The resultant molecular field acting on half of the ionsbelow 30 K removes the degeneracy of the Kramers doublets of the Yb3+ ions and accounts forthe additional excitations observed below 30 K compared with the inelastic neutron scatteringabove 30 K.
K. Mouralova,L. Benes,J. Bednar,R. Zahradnicek,T. Prokes,R. Matousek,P. Hrabec,Z. Fiserova,J. Otoupalik 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
Wire electrical discharge machining (WEDM) is an unconventional machining method for manufacturing complex-shaped, precise components. Considering the high-energy intensity of the wire erosion process, its effective implementation requires a maximum cutting speed while still ensuring the best possible quality of the machined surface. For this latter purpose, we conducted a design of experiment (DoE) comprising 33 cycles and five input factors, or machine setting parameters: Gap voltage, pulse on time, pulse off time, discharge current, and wire feed. In this context, we statistically evaluated the cutting speed in Hadfield steel, as related to machine setting parameters, and also analyzed the machined surfaces of the applied samples. The actual experiment involved examining in detail the topography of the surfaces, using one contact and three non-contact profilers. The surface morphologies were observed via electron microscopy, and a lamella was prepared to facilitate the chemical composition analysis (EDX) with a transmission electron microscope (TEM). To study the subsurface layer and its defects, we produced metallographic specimens of all the samples; the items were observed by means of light and electron microscopes. With a maximum cutting speed the highest quality of the machined surface was achieved; however, the burned cavities can affect the life expectancy of the machined parts. The TEM lamella revealed that the individual alloying elements had segregated into regions, exhibiting high volumes of both manganese and the recast layer and, due to the use of WEDM, a manganese separation layer had formed at the boundary of the recast layer and the base material.
Effects of magnetic anisotropy and exchange in Tm2Fe17
Pirogov, A. N.,Bogdanov, S. G.,Rosenfeld, E. V.,Park, J. -G.,Choi, Y. N.,Lee, Seongsu,Prokeš,, K.,Golosova, N. O.,Sashin, I. L.,Kudrevatykh, N. V.,Skryabin, Yu. N.,Vokhmyanin, A. P. Pleiades Publishing 2012 Journal of experimental and theoretical physics Vol.115 No.5