Browse Prior Art Database

Single-Track Magnetic Read/Write Head Structure

IP.com Disclosure Number: IPCOM000046270D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 66K

Publishing Venue

IBM

Related People

Vinal, AW: AUTHOR

Abstract

Fig. 1 illustrates in plan view, facing a semiconductor substrate 1, the configuration for a magnetic read head for reading vertically recorded information in a magnetic medium. Semiconductor substrate 1 has a diffused emitter 2, two collector contacts 3 and two base contacts 4. A magnetic coupling leg structure 5 couples magnetic flux from surface 6 on a magnetic medium 7 recorded in vertical mode through the coupling legs 5 to the gap in legs 5 in which the emitter 2 is placed. The magnetic transistor, comprising the elements 2, 3, 4, etc., on the semiconductor substrate 1, produces a differential output signal whose polarity and magnitude are controlled by the polarity and magnitude of magnetic field difference applied to the coupling legs 5 at positions A and B, as marked.

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Single-Track Magnetic Read/Write Head Structure

Fig. 1 illustrates in plan view, facing a semiconductor substrate 1, the configuration for a magnetic read head for reading vertically recorded information in a magnetic medium. Semiconductor substrate 1 has a diffused emitter 2, two collector contacts 3 and two base contacts 4. A magnetic coupling leg structure 5 couples magnetic flux from surface 6 on a magnetic medium 7 recorded in vertical mode through the coupling legs 5 to the gap in legs 5 in which the emitter 2 is placed. The magnetic transistor, comprising the elements 2, 3, 4, etc., on the semiconductor substrate 1, produces a differential output signal whose polarity and magnitude are controlled by the polarity and magnitude of magnetic field difference applied to the coupling legs 5 at positions A and B, as marked. When both leg portions 5 are over the same magnetically recorded area, no net difference in polarization or magnitude exists and no signal will be produced. However, if the legs 5 are separated slightly in the vertical plane to straddle adjacent magnetic transitions, such as shown in the cross section in Fig. 2, the highly intense magnetic field may be coupled to the vicinity of the emitter 2 to modulate injection therefrom which can be sensed differentially at the collectors
3.

In Fig. 1, the magnetic medium would be moving in and out of the plane of the paper, while, in Fig. 2, it moves in the direction of the arrow from left to right.

In Fig. 2, the substrate 1 is seen on edge with the magnetically permeable coupling legs 5 also on edge. A difference in altitude between the input portions of the legs 5 at A and B is noted. This may be constructed by first laying down the semiconductor elements, shown generally by the dashed lines and bracket for the emitter 2, and then laying down the permalloy or magnetically permeable legs 5 on top of the semiconductor substrate. Next, an oxide layer may be grown, as shown as 8, at a portion selectively etched away to deposit the leg 5 from position A down to and joining the remainder of the portion of leg 5. The dashed line in Fig. 1 that is labeled 9 is the bend or transition for this portion of...