Structure and magnetic properties of sputtered (Nd,Dy)(Fe,Co,Nb,B) _5.5/M (M = FeCo,Co) multilayer magnets

Authors

W. Liu, University of Nebraska - Lincoln
Z.D. Zhang, Shenyang National Laboratory for Materials Science and International Centre for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110016, People's Republic of China
J. Ping Liu, University of Nebraska-LincolnFollow
Xingzhong Li, University of Nebraska-LincolnFollow
X.K. Sun, Shenyang National Laboratory for Materials Science and International Centre for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110016, People's Republic of China
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

5-15-2002

Comments

Published by American Institute of Physics. J. Appl. Phys. 91, 7890-7892 (2002). ©2002 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

The magnetic properties of nanocomposite multilayer magnets of the (Nd,Dy)(Fe,Co,Nb,B) _5.5/M (M = Co,FeCo) on Ti-buffered Si substrates have been investigated. X-ray diffraction results reveal that the Nd₂Fe₁₄B-type phase in almost all the films is randomly oriented. Different thickness x (nm) for Co layers and y (nm) for FeCo layers were adopted in the multilayers. It is found that high remanence is achieved in the nanocomposite multilayer films consisting of the Nd₂Fe₁₄B-type phase and soft magnetic phase for Co with 6≥x≥4 and for FeCo with 10≥y≥6. The enhancement of the remanence in the nanocomposite multilayer films is attributed to the exchange coupling between the magnetically soft and hard phases. Increasing the soft magnetic components results in a continuously decreasing coercivity.