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

Document Type

Article

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.