Brief Communication | Published:

Sandwich films

Properties of a new soft magnetic material

Nature volume 407, pages 150151 (14 September 2000) | Download Citation



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

    • S. X. Wang
    •  & N. X. Sun
  2. †Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan

    • M. Yamaguchi
    •  & S. Yabukami


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Correspondence to S. X. Wang.

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