Properties of a new soft magnetic material

S. X. Wang (), N. X. Sun, M. Yamaguchi and S. Yabukami
Additional contact information
S. X. Wang: Stanford University
N. X. Sun: Stanford University
M. Yamaguchi: Research Institute of Electrical Communication, Tohoku University
S. Yabukami: Research Institute of Electrical Communication, Tohoku University

Nature, 2000, vol. 407, issue 6801, 150-151

Abstract: 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.

Date: 2000
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DOI: 10.1038/35025142

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