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Magnetic Heads

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Electrochemical Nanotechnologies

Part of the book series: Nanostructure Science and Technology ((NST))

Abstract

Figure 6.1 shows how rapidly the areal density of hard disk drives (HDD) has been increasing over the past 20 years [1]. Several critical innovations were necessary to bring about such rapid progress in the field of magnetic recording [2]. One of the most significant innovations from the viewpoint of material improvement was the electrodeposition of permalloy (Ni80Fe20), which was introduced by IBM in 1979 as the core material of a thin-film inductive head to increase the magnetic recording density [3]. After the introduction of the magneto-resistive (MR) element as the read head and the electrodeposited permalloy as the write head by IBM in 1991 [4], the rate of increase in the recording density of HDDs jumped from 30% per year to 60% per year. Recently, a giant magneto-resistive (GMR) element has been used for the read element instead of the MR element. The rate of increase in the recording density jumped to over 100% per year in 1999, which is an incredible rate of increase. Since 2002, however, the rate of increase has decreased to 30%; thus, new innovations are required to maintain the rate of increase. In 2004, the practical use of perpendicular magnetic recording instead of longitudinal magnetic recording was announced [5]. This system is a critical innovation for developing high-performance HDD systems with high-recording density. The design of the magnetic recording head was changed because of the change of the recording system.

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Authors and Affiliations

  1. High Density Interconnection Group, Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan

    Tokihiko Yokoshima

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  1. Tokihiko Yokoshima
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Correspondence to Tokihiko Yokoshima .

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Editors and Affiliations

  1. Fac. Science & Engineering, Waseda University, Okubo 3-4-1, Tokyo, 169-8555, Japan

    Tetsuya Osaka

  2. Emerson Network Power, Cooligy Precision Cooling, Maude Avenue 800, Mountain View, 94043, USA

    Madhav Datta

  3. Fac. Engineering, Tel Aviv University, Tel Aviv, 69978, Israel

    Yosi Shacham-Diamand

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Yokoshima, T. (2010). Magnetic Heads. In: Osaka, T., Datta, M., Shacham-Diamand, Y. (eds) Electrochemical Nanotechnologies. Nanostructure Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1424-8_6

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