@article{73dd6f852acf406d9e24470b1879eed6,
title = "New soft magnetic conife plated films with high Bs = 2.0-2.1 T",
abstract = "A CoNiFe film with saturation magnetic flux density (Bs) greater than 2.0 tesla (T) has been prepared for the first time as a soft magnetic film; the coereivity (Hc) of the film is less than 160 A/m (2.0 Oe). This success was achieved by formulating a new plating bath and operating conditions to form fine grains. The film has a low Hc of less than 160 A/m, a low saturation magnetostriction (λs) of approximately 10-6, and a high Bs of 2.0-2.1 T. The present invention is expected to contribute to accelerating the development of not only the technology of high-density magnetic recording but also the field of magnetic materials in general.",
keywords = "Electroplating, High b soft magnetic film",
author = "Tetsuya Osaka and Madoka Takai and Katsuyoshi Hayashi and Yoshimichi Sogawa",
note = "Funding Information: A thin film head was first introduced in 1979 by IBM to increase the magnetic recording density. Electroplated permalloy (Ni,oFe,,) as the read-write core material played a key role in the technology [ 11. Following the introduction by IBM of the magneto-resistive (MR) element as read head and the electroplated permalloy core as a write head in 1991 [2], the speed of increase in the areal density of hard disk drive (HDD) jumped from 10 times per decade to 100 times per decade. It is presently assumed that the required magnetic recording density will continue to increase beyond 20Gbit/inch2 into the 21st century. In ultra high density recording, problems such as the saturation of the write head core and thermal relaxation of recording medium will become serious [3]. Such a substantial increase in the areal density demands increases in saturation magnetic flux density (BJ and specific resistance ( p ), of the write head core material. The maximum values for permalloy presently being used are Bs=0.9-1. O T and p =20-25 psZ cm. Many different films have been reported to possess high B, values. Examples are electroplated CoFe with B, =1.8-1.9 T [4]-[6], electroplated CoNiFe with B, =1.6-1.8 T [7]-[9], and sputtered Fe-based nano-crystalline alloys such T.Osaka Tel: +81-3-5286-3202, Fax: +81-3-3205-2074, e-mail: osakatet@mn.waseda.ac.jp The work was financially supported by the Research for future project “Advanced Research and Development on Ultra High Magnetic Recording Device by means of Atomic Interface Design” of the Japan Society for Promotion of Science, the Grant-in-Aid for Scientific Research on Priority Area of “Electrochemistry of Ordered Interface” from Ministry of Education, Science, Sports and Culture, Japan, and the Storage Research Consortium (SRC).",
year = "1998",
doi = "10.1109/20.706572",
language = "English",
volume = "34",
pages = "1432--1434",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4 PART 1",
}