Magnetic transitions and scaling in anisotropic rare-earth glasses

Authors

Kevin M. Lee, Kansas State UniversityFollow
Michael J. O'Shea, Kansas State UniversityFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

4-15-1987

Comments

Published by American Institute of Physics. J. Applied Physics 61, 3616 (1987). ©1987 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

We report studies of the magnetic critical behavior as a function of anisotropy strength in rare-earth-rich glasses. Anisotropy is induced in Gd-Co by alloying with Tb. The system studied is Gd_65-xTb_xCo₃₅ and the random magnetic anisotropy (RMA) strength may be increased by increasing x. The x=0 alloy of this series has been shown to exhibit standard critical behavior expected for a second-order phase transition. With increasing x we find deviations from this behavior due to the presence of RMA. We present detailed results for the alloy with composition x=50 at. % and show that for large enough magnetic fields the system continues to show standard ferromagnetic scaling but for low enough fields the system crosses over to a behavior describable by nonlinear scaling similar to that found in spin-glass systems. Journal of Applied Physics is copyrighted by The American Institute of Physics.