Magnetic Head Terminals for Laser Diode Heating
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Solution Overview
Problem
As magnetic bits and grains on magnetic media shrink to achieve higher data density, they become magnetically unstable, requiring thermally assisted recording systems that need improved heat application for data writing, but existing electrical connections to laser diodes for heating are inefficient.
Innovation Solution
A magnetic recording slider with electrically conductive terminals on both the trailing edge and backside surfaces, connected by an electrical lead, facilitating a larger surface area for connection with a laser diode, enabling effective heating of the magnetic medium during data writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of magnetic bits and magnetic grains is reduced to achieve higher data density, then data storage capacity is improved, but magnetic stability of recorded bits deteriorates
Solution Approach 1:
The patent applies thermal assistance by changing the temperature parameter of the magnetic medium. A laser diode heats the media to elevated temperatures where coercivity is lowered, enabling magnetic bits to be written with smaller grains. After writing, the media cools and the bits become magnetically stable, thus achieving high density while maintaining stability through temperature parameter changes.
2Stability of the object's composition
If a laser diode is used to locally heat the magnetic media for thermally assisted recording, then magnetic stability at room temperature is improved, but the electrical connection efficiency to the laser diode deteriorates
Solution Approach 1:
The patent extends the electrical connection from a single-point connection to a planar surface connection by forming the terminal on the backside surface of the slider. This dimensional change from 0D/1D connection to 2D surface connection improves electrical contact area and reduces connection resistance, thereby improving electrical connection efficiency for laser diode power delivery.
3Stability of the object's composition
If the coercivity of the magnetic medium is increased to maintain magnetic stability, then data retention is improved, but the ability to write data deteriorates
Solution Approach 1:
The patent employs periodic thermal action using a laser diode to temporarily reduce coercivity during the writing process. The media is heated in a periodic manner during writing, then allowed to cool between writes. This periodic heating and cooling enables data writing during low-coercivity phases while maintaining high coercivity and data retention during cool phases.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the electrical connection with the laser diode, allowing for efficient heat application to the magnetic medium, stabilizing the magnetic bits and improving data writing stability.
Implementation Method 1
A heat source such as a laser can be used to locally heat the media immediately prior to recording, which temporarily lowers the coercivity of the media so that data can be written
Implementation Method 2
An electrical lead is formed within the head and connects the electrically conductive first terminal with the electrically conductive second terminal
Implementation Method 3
When a current flows through the coil, a resulting magnetic field causes a magnetic flux to flow through the write pole, which results in a magnetic write field emitting from the tip of the write pole
Implementation Method 4
The magnetoresistive sensor has an electrical resistance that changes in response to an external magnetic field. This change in electrical resistance can be detected by processing circuitry in order to read magnetic data from the adjacent magnetic media
Data Source
AI summary
A slider for magnetic data recording in a thermally assisted recording system. The slider has a slider body and a magnetic recording head formed on a trailing edge of the slider body. A first terminal is formed on a trailing edge surface of the recording head, and a second terminal is formed on a backside surface both the magnetic recording head and the slider body so as to extend across both the magnetic recording head and the slider body. An electrically conductive lead formed within the magnetic recording head connects the first lead with the second lead.