Dependence of Exchange Coupling Interaction on Micromagnetic Constants in Hard/Soft Magnetic Bilayer Systems

Published

September 1, 2007

Author(s)

Antonio Zambano, Hiroyuki Oguchi, Ichiro Takeuchi, Y W. Choi, J.S. Jiang, J P. Liu, S E. Lofland, Daniel Josell, Leonid A. Bendersky

Abstract

To elucidate the dependence of exchange coupling behavior of hard/soft magnetic bilayer systems on various micromagnetic constants, the coupling length and the nucleation field (H (superscript_N)) were systematically measured on five thin film libraries made of soft-magnetic/hard-magnetic bilayers. Hysteresis loops of CoPt/Fe(superscript_x)Co(superscript_1-x) (0x1), CoPt/Ni, CoPt/Fe, Sm(superscript_2)Co(superscript_7)/(Fe, Co or Ni), and Sm(subscript_2)Co(subscript_7)/Ni were measured using a magneto-optical Kerr effect (MOKE) set up. The 1-dimensional model proposed by Leineweber et al.(superscript 1) and micromagnetic simulations were used to interpret the behavior of and H(superscript_N) obtained by the high-throughput investigation. We found that the dominant factors determining and H(subscript_N) are the hard layer magnetic constants and the saturation magnetization (M) of the soft layer H(subscript_N) and display a direct correlation with the domain wall width of the hard layer and has an anticorrelation with M of the soft layers. They were found to show no strong dependence on exchange stiffness (A) and anisotropy (K) constants within the group of soft layer materials studied here.

Citation

Physical Review B (Condensed Matter and Materials Physics)

Pub Type

Journals

Citation

Zambano, A. , Oguchi, H. , Takeuchi, I. , Choi, Y. , Jiang, J. , Liu, J. , Lofland, S. , Josell, D. and Bendersky, L. (2007), Dependence of Exchange Coupling Interaction on Micromagnetic Constants in Hard/Soft Magnetic Bilayer Systems, Physical Review B (Condensed Matter and Materials Physics) (Accessed April 24, 2024)