Dual Wire WAMR/HAMR Writing Head Design
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Solution Overview
Problem
The integration of metallic structures with optical transducers in heat-assisted magnetic recording (HAMR) heads is complex and hinders optical performance, as these structures interfere with light propagation and reduce energy density, while wire amplified magnetic recording (WAMR) heads require minimal metallic components to maintain efficiency.
Innovation Solution
A recording head design incorporating a waveguide and optical transducer to heat a storage medium, combined with metallic wires adjacent to the air bearing surface to generate a magnetic field, where the wire's current produces a magnetic field in the heated area, optimizing the placement of metallic components to minimize interference with optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If metallic structures are integrated with optical transducers in HAMR heads to produce magnetic fields, then magnetic field strength is improved, but optical performance deteriorates due to interference with light propagation
Solution Approach 1:
The recording head is divided into functionally separate components: the optical transducer (waveguide and laser) is separated from the metallic wire structures. The wire is positioned adjacent to the air bearing surface rather than integrated with the optical path, allowing independent optimization of optical and magnetic functions without mutual interference
Solution Approach 2:
The air bearing surface acts as an intermediary space that allows the wire to be positioned close to the storage medium for effective magnetic field generation while maintaining separation from the optical transducer. This intermediate positioning enables both functions to operate effectively without direct interaction
2Adaptability or versatility
If metallic structures are placed close to the optical transducer to generate magnetic fields, then magnetic recording capability is improved, but device complexity increases
Solution Approach 1:
The metallic wire structure is extracted from the optical transducer assembly and positioned separately adjacent to the air bearing surface. This extraction eliminates the need for complex integrated structures while maintaining both HAMR and WAMR functionalities through simple spatial arrangement
Solution Approach 2:
The recording head design achieves multi-functionality by combining HAMR (optical heating) and WAMR (wire-amplified magnetic field) capabilities in a single device. The wire serves dual purposes: generating magnetic fields for recording and potentially serving as a structural element, while the optical transducer provides heating capability
3Force
If wires are positioned adjacent to the air bearing surface for WAMR, then magnetic field delivery is improved, but optical energy density at the transducer is reduced
Solution Approach 1:
The wire is positioned locally adjacent to the air bearing surface where it is needed for magnetic field generation, while the optical transducer maintains its optical path integrity. This localized positioning ensures magnetic field effectiveness without compromising optical energy delivery to the storage medium
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 enhances the magnetic field strength and stability while maintaining optical efficiency, allowing for higher areal storage densities and reduced complexity in the recording head structure.
Implementation Method 1
an optical transducer for coupling electromagnetic radiation from the waveguide to a point adjacent to an air bearing surface to heat a portion of a storage medium
Implementation Method 2
a first wire positioned adjacent to the air bearing surface, wherein current in the wire produces a magnetic field in the heated portion of the storage medium
Data Source
AI summary
An apparatus comprises a waveguide, an optical transducer for coupling electromagnetic radiation from the waveguide to a point adjacent to an air bearing surface to heat a portion of a storage medium, and a first wire positioned adjacent to the air bearing surface, wherein current in the wire produces a magnetic field in the heated portion of the storage medium.