Magnetic and structural properties of SmCo_7-xCu_x alloys

Authors

I.A. Al-Omari, University of Nebraska - Lincoln
Y. Yeshurun, Institute of Superconductivity and Department of Physics, Bar-Ilan University, Ramat Gan 52900, Israel
Jian Zhou, University of Nebraska - Lincoln
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

May 2000

Comments

Published by American Institute of Physics. J. Applied Physics 87, 6710 (2000). ©2000 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

We report the structural and magnetic properties of SmCo_7-xCu_x, 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 T_c = 852 °C is found in these alloys.