HAMR Write Pole Segmentation for Near-Field Transducer Spacing Control
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Solution Overview
Problem
Current heat-assisted magnetic recording (HAMR) technologies face challenges in achieving precise control over near-field transducer to write pole spacing, which affects the magnetic field and coupling efficiency, leading to limitations in areal data density due to superparamagnetic effects.
Innovation Solution
The design of a write head apparatus with a waveguide adjacent to the air bearing surface, featuring a near-field transducer with a peg and disc configuration, and a two-portion write pole, where the second portion extends orthogonally to the air bearing surface, allowing for controlled near-field transducer to pole spacing and improved heat dissipation, enhancing magnetic field delivery and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the near-field transducer to write pole spacing is reduced to improve areal data density, then higher data density is achieved, but magnetic field strength and coupling efficiency deteriorate
Solution Approach 1:
The write pole is divided into two portions: a first portion extending at a non-orthogonal angle and a second portion extending orthogonally. This segmentation allows the first portion to be positioned closer to the near-field transducer for improved coupling efficiency and areal data density, while the second portion extends outward to maintain sufficient magnetic field strength at the air bearing surface, thus resolving the contradiction between reduced spacing and maintained field strength.
2Reliability
If the near-field transducer to write pole spacing is reduced to improve coupling efficiency, then coupling efficiency is improved, but thermal stability deteriorates
Solution Approach 1:
The two-portion write pole structure enables the first portion to be positioned close to the near-field transducer for improved coupling efficiency, while the second portion extends orthogonally to the air bearing surface to maintain adequate spacing for thermal stability. This segmentation allows simultaneous optimization of both coupling efficiency and thermal stability.
3Quantity of substance
If the write pole is positioned closer to the near-field transducer to improve areal data density, then areal data density is improved, but manufacturing precision requirements increase
Solution Approach 1:
The write pole is segmented into two portions with different orientations. The first portion can be positioned closer to the near-field transducer to improve areal data density, while the second portion extends orthogonally to maintain manufacturing feasibility. This segmentation reduces the precision requirements compared to positioning the entire pole closer, as the second portion can be formed using standard orthogonal deposition processes.
Solution Approach 2:
The write pole employs an asymmetric structure where the first portion extends at a non-orthogonal angle while the second portion extends orthogonally. This asymmetric design allows optimization of the coupling region (first portion) while maintaining manufacturing simplicity in the field generation region (second portion), thus improving areal data density without excessively increasing manufacturing precision requirements.
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 design effectively controls the near-field transducer to pole spacing, maintaining magnetic field strength and coupling efficiency while achieving higher areal data densities by optimizing the thermal and magnetic performance of the recording head.
Implementation Method 1
an electromagnetic wave of, for example, visible, infrared, or ultraviolet light can be directed onto a surface of a data storage media to raise the temperature of a localized area to facilitate switching
Implementation Method 2
the applied magnetic writing fields to more easily direct the magnetization during the temporary magnetic softening caused by the heat source
Data Source
AI summary
An apparatus includes a waveguide and a near-field transducer adjacent the waveguide. The near-field transducer includes an enlarged region and a peg region extending from the enlarged region towards an air bearing surface. A write pole is adjacent the near-field transducer and include a first portion having an edge extending towards the air bearing surface at a non-orthogonal angle with respect to the air bearing surface. A second portion of the write pole extends orthogonally to the air bearing surface and is in contact with the first portion. The apparatus includes an insulator-filled gap at the air bearing surface between the second portion of the write pole and the peg region of the near-field transducer. The gap is bounded away from the air bearing surface by the enlarged region of the near-field transducer.