Research Papers in Physics and Astronomy


Date of this Version

May 2000


Published by American Institute of Physics. J. Applied Physics 87, 6710 (2000). ©2000 American Institute of Physics. Permission to use.


We report the structural and magnetic properties of SmCo7-xCux, where x= 0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7. X-ray diffraction shows that these alloys from the disordered hexagonal TbCu7-type structure. For large values of x (x≥0.8) the hexagonal TbCu7-type structure cannot be formed. X-ray diffraction on magnetically aligned samples show that these samples have uniaxial anisotropy. The lattice parameters (a and c) are dependent on the Cu concentration, and the unit cell volume is found to increase with x. The saturation magnetization decreases with x at both room temperature and 25 K. The Curie temperature increases with x for small values of x while it decreases with x for large values of x. A maximum value of Tc = 852 °C is found in these alloys.

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