-Ku Material Notch in Magnetic Recording Head Trailing Shield
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Solution Overview
Problem
Conventional magnetic recording devices face challenges in achieving high areal density due to magnetic flux shunting from the main pole to the trailing shield, which reduces the effectiveness of the write magnetic field and field gradient.
Innovation Solution
Incorporating a negative anisotropic magnetic (-Ku) material notch adjacent to the trailing gap and hot seed layer in the magnetic recording head, which reduces shunting and enhances the write magnetic field and down-track field gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gap between the main pole and the trailing shield is reduced to increase magnetic field gradients, then the write head resolution is improved, but magnetic flux shunting from the main pole to the trailing shield increases
Solution Approach 1:
A non-magnetic material layer is introduced as an intermediary between the main pole and the trailing shield. This intermediary layer prevents direct magnetic flux shunting while maintaining the small gap distance, thus preserving write head resolution without the energy loss associated with flux shunting.
Solution Approach 2:
The magnetic flux shunting path is extracted or removed from the system by introducing a non-magnetic barrier that blocks the unwanted flux path, while the useful flux path from the main pole to the media remains intact.
2Loss of energy
If magnetic flux shunting is reduced to increase effective write magnetic field, then the areal density capacity is improved, but the gap between main pole and trailing shield must be managed carefully
Solution Approach 1:
The non-magnetic material serves as a mediator that allows the gap to be minimized for field gradient purposes while simultaneously preventing flux shunting, thus achieving both high effective write field and small gap distance.
Solution Approach 2:
The magnetic properties of the material in the gap region are changed by introducing a non-magnetic material, which fundamentally alters the flux distribution and eliminates shunting while maintaining the geometric parameters needed for high field gradients.
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
The -Ku material notch increases the effective write magnetic field and down-track field gradient, leading to improved areal density capacity and higher bits per inch writing capability.
Implementation Method 1
a notch comprising a negative anisotropic magnetic (-Ku) material... the notch comprising the -Ku material results in the magnetic recording having an increased effective write magnetic field, an increased down-track field gradient due to reduced shunting
Data Source
AI summary
Embodiments of the present disclosure generally relate to a magnetic recording device comprising a magnetic recording head having a negative anisotropic magnetic (−Ku) material notch. The magnetic recording device comprises a main pole disposed at a media facing surface (MFS), a trailing shield disposed adjacent to the main pole, and a trailing gap disposed between the main pole and the trailing shield. The trailing shield comprises a hot seed layer disposed adjacent to the trailing gap, and a notch comprising a −Ku material in contact with the hot seed layer and the trailing gap. The notch is disposed adjacent to a first surface of the main pole at the MFS. The notch comprising the −Ku material results in an increased effective write magnetic field, an increased down-track field gradient due to reduced shunting from the main pole to the trailing shield, leading to an increased areal density capacity.