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Direct Pole-Tip Excitation in the Magnetic Recording Write-Head

IP.com Disclosure Number: IPCOM000015651D
Original Publication Date: 2002-Sep-13
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 85K

Publishing Venue

IBM

Abstract

ON HOLD UNTIL NEW DISCLOSURE IS FULLY EVALUATED DO NOT SEND FOR PUBLICATION Disclosed is a new configuration for the writing-coil on the magnetic recording head. In this configuration, one of the coil's "turns", or a parallel branch of a turn, is routed so that it is located as close as possible to the so-called "flare-point" of the pole-tip of the writer. Because of the small dimension and the flaring-shape of the pole-tip the magnetization of the magnetic material begins to "stiffen" significantly due to stress-induced anisotropy and domain-wall pinning. An example is provided in Figure-1, where at the end of the outermost turn of the "conventional" portion of the spiral-coil the write-current is routed backward on the opposite side of P2. The routing is done through two parallel legs (Leg-1 Leg-2), where Leg-2 carries a portion of the total write-current and routes past the pole-tip in the proximity of the flare-point. Having two parallel legs gives control of the portion of current passing near the flare-point, for concerns of undesirable pole-tip saturation. Of course, Leg-1 could be taken out to have the entire write-current route through Leg-2. Figure-2 is an illustration of the cross-section of the head depicted in Figure-1. Figure-3 shows an embodiment of this invention implemented on a solenoid coil [*]. Figure-1

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Direct Pole-Tip Excitation in the Magnetic Recording Write-Head

   ON HOLD UNTIL NEW DISCLOSURE IS FULLY EVALUATED - DO NOT SEND FOR PUBLICATION

Disclosed is a new configuration for the writing-coil on the magnetic recording head. In this configuration, one of the coil's "turns", or a parallel branch of a turn, is routed so that it is located as close as possible to the so-called "flare-point" of the pole-tip of the writer. Because of the small dimension and the flaring-shape of the pole-tip the magnetization of the magnetic material begins to "stiffen" significantly due to stress-induced anisotropy and domain-wall pinning.

An example is provided in Figure-1, where at the end of the outermost turn of the "conventional" portion of the spiral-coil the write-current is routed backward on the opposite side of P2. The routing is done through two parallel legs (Leg-1 & Leg-2), where Leg-2 carries a portion of the total write-current and routes past the pole-tip in the proximity of the flare-point. Having two parallel legs gives control of the portion of current passing near the flare-point, for concerns of undesirable pole-tip saturation. Of course, Leg-1 could be taken out to have the entire write-current route through Leg-2. Figure-2 is an illustration of the cross-section of the head depicted in Figure-1. Figure-3 shows an embodiment of this invention implemented on a solenoid coil [*].

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