Effect of disorder on the magnetic properties of SmCo₅

Authors

Diandra Leslie-Pelecky, University of Nebraska -- LincolnFollow
R.L. Schalek, Department of Mechanical Engineering and Center for Materials Research & Analysis, University of Nebraska, Lincoln, Nebraska 68588-0656

Date of this Version

January 1999

Comments

Published by American Physical Society. Phys. Rev. B 59, 457-462 (1999). http://prb.aps.org. Copyright © 1999 American Physical Society. Permission to use.

Abstract

Mechanical milling of initially ordered ferromagnetic SmCo₅ produces dramatic increases in coercivity after short (15 min to 1 h) milling times, accompanied by remanence ratios on the order of 0.7 and shifted hysteresis loops. X-ray diffraction shows that milling induces both chemical and structural disorder. The hysteresis-loop shift is continuous and nonlinear with temperature over the range 5–300 K. The high coercivities are attributed to the formation of a nanostructure consisting of crystalline SmCo₅ regions separated by a disordered interphase.