Dual electrical lapping guides with common bonding pad
View Patent ↗A recording head comprises a write element, including a coil and a dynamic fly-height heater, and two electrical lapping guides. The head also comprises a number of bonding pads including a DFH bonding pad and a shared bonding pad both electrically connected to the dynamic fly-height heater. Each lapping guide defines a circuit between the shared bonding pad and a dedicated bonding pad and each includes a resistive element. The resistive elements of the two lapping guides can be vertically aligned to be used to control a lapping tilt angle when a bar of unfinished heads is lapped. After lapping, a channel is defined into the transducer of the recording head. Forming the channel can remove at least a portion of each lapping guide in order to break the electrical circuit of that guide.
1. A magnetic recording head comprising:
a write element including a write coil and a dynamic fly-height heater;
a DFH bonding pad and a shared bonding pad both electrically connected to the dynamic fly-height heater;
a first electrical lapping guide electrically connected to a first electrical lapping guide bonding pad and the shared bonding pad; and
a second electrical lapping guide electrically connected to a second electrical lapping guide bonding pad and the shared bonding pad.
2. The magnetic recording head of claim 1 further comprising a pair of write coil bonding pads electrically connected to the write coil.
3. The magnetic recording head of claim 1 further comprising an MR stripe and a pair of read bonding pads electrically connected therewith.
4. The magnetic recording head of claim 1 wherein the total number of bonding pads is no more than eight.
5. The magnetic recording head of claim 1 wherein the first electrical lapping guide includes an open circuit between the shared bonding pad and the first electrical lapping guide bonding pad.
6. The magnetic recording head of claim 5 wherein the second electrical lapping guide includes an open circuit between the shared bonding pad and the second electrical lapping guide bonding pad.
7. The magnetic recording head of claim 1 further comprising an air bearing surface including a channel that creates the open circuit between the shared bonding pad and the first electrical lapping guide bonding pad.
8. The magnetic recording head of claim 7 wherein the channel also creates an open circuit between the shared bonding pad and the second electrical lapping guide bonding pad.
9. The magnetic recording head of claim 1 wherein the magnetic recording head comprises a perpendicular recording head.