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Sandwich films

Properties of a new soft magnetic material

Nature volume 407, pages 150–151 (2000)Cite this article

Abstract

The development of advanced electromagnetic devices has been constrained by a lack of soft magnetic materials with a suitably high saturation magnetization (over 20 kilogauss) and a large permeability roll-off frequency (greater than 1 gigaherz). For example, magnetic hard-disk-drive technology is rapidly approaching the perceived superparamagnetic limit at which the stored bits become thermally unstable1 — disks with higher anisotropy are more stable but are not usable because magnetic write heads become saturated. Here we describe a new soft magnetic material with a saturation magnetization of 24 kilogauss and a large permeability of 1,000–1,400 in a wide frequency range of up to about 1.2 gigaherz. This new material promises to have wide application in devices such as magnetic recording heads and integrated inductors.

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Figure 1: Relative permeability, both real and imaginary parts, versus frequency for a typical Ni0.81Fe0.19 (5 nm)/(Fe0.7Co0.3)0.95N0.05 (100 nm)/ Ni0.81Fe0.19 (5 nm) film.

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Authors and Affiliations

  1. Laboratory of Advanced Materials Department of Materials Science and Engineering, Stanford University, Stanford, 94305-4045, California, USA

    S. X. Wang & N. X. Sun

  2. Research Institute of Electrical Communication, Tohoku University, Sendai, 980-8577, Japan

    M. Yamaguchi & S. Yabukami

Authors
  1. S. X. Wang
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  2. N. X. Sun
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  3. M. Yamaguchi
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  4. S. Yabukami
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Corresponding author

Correspondence to S. X. Wang.

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Wang, S., Sun, N., Yamaguchi, M. et al. Properties of a new soft magnetic material . Nature 407, 150–151 (2000). https://doi.org/10.1038/35025142

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