By John C. Mallinson
This quantity within the educational Press Electromagnetism sequence is the second one version of the e-book on magneto-resistive heads. This publication is written through John C. Mallinson, who's one of many top specialists all over the world within the region of magnetic recording. he's popular and extremely popular within the magnetics neighborhood for his many vital contributions to the sector of magnetic facts garage to boot, as for his well-written and influential books on magnetic recording. This moment version of his past publication on magneto-resistive heads displays the exceptional and explosive development in magnetic garage expertise the place anisotropic magneto-resistive heads have been quick displaced by means of tremendous magneto-resistive heads, spin valves. evidently, this version comprises many newly written chapters regarding immense magneto-resistive heads. those chapters hide such new themes as artificial antiferromagnet and ferrimagnet multilayer expertise, magnetization fluctuation noise in small massive magneto-resistive heads, vast magneto-resistance and spin established tunneling phenomena and their relevance to the longer term improvement of magnetic recording.
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Additional resources for Magneto-resistive Spin Valve Heads. Fundamentals and Applications
4. The magneto-resistive change in resistance versus disk field, showing the effects of the nonuniform demagnetizing field. In all MRHs, the output signal voltage is, by Ohm's law, equal to the resistance change times the measuring current: 8 V - ISR. When the magnetization angle 0 in the MRE increases, magnetic poles are generated in the top and bottom regions of the sensor, as shown in Fig. 3. These poles, of north polarity at the top and south at the bottom, generate an internal field, usually called the demagnetizing field, yHd.
MRE) is used consistently throughout this book. The width direction is usually both the electrical current direction and the recorded track-width direction. A plot of the variable part of the resistance of a material like permalloy versus the magnetization angle is shown in Fig. 2. Because the maximum value of the variable part of the resistance occurs at 0 = 0, it is seen that, perhaps counter to intuition, the resistance is maximum when the magnetization and current are parallel. Note that the resistance change versus angle characteristic has an inflection point at 0 = 45 ~ where the characteristic is, for small angular excursions, almost linear.
CHAPTER 4 The Anisotropic Magneto-Resistive Effect The Basic Effect In 1857, William Thomson, who later became Lord Kelvin, discovered that the electrical resistance of an iron bar changed as its magnetization was altered. This phenomenon is now called the anisotropic magnetoresistive (AMR) effect, and it remained a mere academic curiosity until Bob Hunt invented the anisotropic magneto-resistive head (AMRH). In a thin film of magnetic material, the magnetization can be single domain and not be subdivided by domain walls into the multidomain state.
Magneto-resistive Spin Valve Heads. Fundamentals and Applications by John C. Mallinson