# Magnetic properties of (Mn_{1-x}Ru_{x})_{3}Ga alloys

DOI: 10.1007/s003390101148

- Cite this article as:
- Hori, T., Akimitsu, M., Miki, H. et al. Appl Phys A (2002) 74: s737. doi:10.1007/s003390101148

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## Abstract.

We found that the pseudo binary alloys Mn_{1-x}Ru_{x}_{3}Ga, with 0.33≤x≤0.67, have an ordered b.c.c. structure. The lattice constant a is almost constant with respect to x: a=6.000 Å for x=0.33 and a=5.992 Å for x=0.67. For the alloy with x=0.33, i.e. Mn_{2}RuGa, the magnetization is almost saturated in a field of 20 kOe. The saturation magnetization at 4.2 K is 23 emu/g, and the Curie temperature, T_{C}, is 460 K. The T_{C} of (Mn_{1-x}Ru_{x})_{3}Ga decreases almost linearly with increasing x, and it vanishes around x=0.67 (MnRu_{2}Ga). We also determined atomic and magnetic structures from neutron diffraction experiments. The alloy Mn_{2}RuGa (x=0.33) has an ordered structure of CuHg_{2}Ti type; the magnetic Mn atoms mainly occupy the 4a (0,0,0) and 4d \(\frac\Box3\Box\Box4\Box\),\(\frac\Box3\Box\Box4\Box\),\(\frac\Box3\Box\Box4\Box\) sites. We also observedthat the magnetic moments of Mn atoms on the 4a and 4d sites are antiparallel to each other; values of the magnetic moment are μ_{a}=4.6 and μ_{d}=3.3 μ_{B} per Mn atom.