Shan X. Wang's Magnetic Information Storage Technology: A Volume in the PDF

By Shan X. Wang

ISBN-10: 0127345701

ISBN-13: 9780127345703

This article explains how harddrive drives function, how billions of bytes of electronic info are kept and accessed, and the place the expertise goes. specifically, the ebook emphasizes the main basic rules of magnetic details garage, together with in-depth wisdom of either magnetics and sign processing tools. Magnetic details garage expertise includes many image illustrations and an advent of different garage applied sciences, resembling optic disk recording, holographic recording, semiconductor flash reminiscence, and magnetic random entry reminiscence. * presents the basics of magnetic details garage and contrasts it with a comparability of other garage applied sciences* Addresses the topic on the fabrics, equipment and process degrees* Addresses the wishes of the multi-billion-dollar-a 12 months magnetic recording and knowledge garage undefined* Emphasizes either theoretical and experimental suggestions* Condenses present wisdom on magnetic details garage expertise into one self-contained quantity* compatible for undergraduate and graduate scholars, in addition to pro researchers, engineers and execs in info and data garage fields

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Extra info for Magnetic Information Storage Technology: A Volume in the ELECTROMAGNETISM Series

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The magnetization energy is isotropic in the film plane. Stress Anisotropy. When a magnetic material is saturated by a magnetic field, its dimension will change accordingly. The saturation magnetostriction constant is defined as the fractional change in length along the magnetization: AI '~s = ml The magnetostriction constant is usually a small number (<10-4). 2 REVIEW OF BASIC MAGNETICS 23 If the magnetostriction constant is isotropic, but the magnetic material is subject to a uniaxial stress ~r, then the stress anisotropy energy per unit volume is 3 E = Z,~sosin 2 8.

5) The ultimate goal in the magnetic storage research and development is to raise both linear density and track density to achieve the largest feasible 10 CHAPTER 1 Introduction areal recording density, which will usually translate into larger capacity, lower cost per megabyte and faster access time. 4 History and trends in digital magnetic recording Hard disk drives, also called rigid disk files, or direct access storage devices (DASD), were first developed by IBM, San Jose, California in the late 1950s.

Demagnetizing Factors of Selected Shapes Shape Sphere Long cylinder along z-axis Infinite film normal to z-axis Strip film normal to z-axisa (t, thickness; W, width; L, length; t~W~L) N1 N2 N3 1/ 3 1/2 0 0 1/3 1/2 0 2 t ~rW 1/3 0 1 ---1 a The d e m a g n e t i z i n g factors listed are at the center of the strip film. , Cullity, Introduction to Magnetic Materials, Appendix 6). 4 Ferromagnetism and magnetic hysteresis Many materials such as iron and steel display a spontaneous magnetization, so they are called ferromagnetic materials.

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Magnetic Information Storage Technology: A Volume in the ELECTROMAGNETISM Series by Shan X. Wang

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