Magnetic Head Spin Toroscillator Height Segmentation
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Solution Overview
Problem
In magnetic heads with spin torque oscillators, the writer height and element height being the same leads to degradation in recording characteristics and performance, and increasing the voltage to enhance recording density results in heat generation, shortening the magnetic head's lifespan.
Innovation Solution
The magnetic head design differs in writer height and element height, with the element height being greater than the writer height, and includes an insulating layer, nonmagnetic layer, or heat sink to manage heat and improve performance, ensuring the writer height is between 5 nm and 200 nm and the element height between 10 nm and 500 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the writer height is increased to improve recording characteristics, then the magnetic flux leakage is reduced, but the element height must also be increased which leads to heat generation
Solution Approach 1:
The patent divides the vertical dimension into two independent parameters: writer height (distance between main pole and trailing shield) and element height (height of spin torque oscillator). This segmentation allows the writer height to be optimized for recording characteristics while the element height can be managed separately with heat dissipation structures, resolving the contradiction between improved recording and heat generation.
Solution Approach 2:
The patent introduces heat sink structures and thermal management components as intermediaries between the spin torque oscillator and the environment. These intermediaries facilitate heat dissipation from the element, allowing the writer height to be increased for better recording characteristics without the heat generation problem that would otherwise occur.
2Productivity
If the voltage is increased to enhance recording density, then the recording performance is improved, but heat generation increases which shortens the magnetic head's lifespan
Solution Approach 1:
The patent converts the harmful effect of heat generation into a manageable parameter by introducing dedicated heat dissipation structures. By providing thermal management pathways, the system can operate at higher voltages for enhanced recording density while the heat is efficiently dissipated, preventing the lifespan reduction that would otherwise occur.
Solution Approach 2:
Heat sink structures and thermal management components act as intermediaries that facilitate the safe dissipation of heat generated during high-voltage operation. These intermediaries enable the system to achieve high recording density through increased voltage while maintaining component lifespan by preventing excessive heat accumulation.
3Reliability
If the element height is increased to improve spin torque oscillator performance, then the oscillator function is enhanced, but the writer height must also be increased leading to greater heat generation
Solution Approach 1:
The patent segments the vertical dimension into writer height and element height as independent parameters. This allows the element height to be increased for improved spin torque oscillator performance while the writer height can be optimized separately. The thermal management structures are positioned to handle the heat from the taller element without compromising the recording characteristics.
Solution Approach 2:
The patent addresses the heat generation problem by introducing horizontal thermal management structures (heat sinks extending laterally) rather than simply increasing vertical height. This dimensional approach allows the element height to be increased for oscillator performance while heat is dissipated through lateral pathways, avoiding the heat accumulation that would result from purely vertical scaling.
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 avoids the issues of identical writer and element heights, enhances recording characteristics, and suppresses heat generation, thereby extending the magnetic head's lifespan by maintaining optimal performance and preventing overheating.
Implementation Method 1
a spin torque oscillator disposed between the main pole and the trailing shield and electrically connected to the main pole and the trailing shield
Implementation Method 2
The magnetic path forming section is made of a magnetic material and forms a magnetic path for passing a magnetic flux corresponding to the magnetic field generated by the coil
Implementation Method 3
The coil generates a magnetic field corresponding to data to be written on the recording medium
Implementation Method 4
a read head unit having a magnetoresistive element (hereinafter, also referred to as MR element) for reading
Data Source
AI summary
A magnetic head includes a medium facing surface, a main pole, a trailing shield, and a spin torque oscillator. A bottom surface of the trailing shield includes a first portion that includes an end located in the medium facing surface and is in contact with the spin torque oscillator at least in part. An element height that is a dimension of the spin torque oscillator in a direction perpendicular to the medium facing surface and a writer height that is a dimension of the first portion in the direction perpendicular to the medium facing surface are different from each other.