Magnetic Head with Organic Molecular Layer for High Density Data Reading
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Solution Overview
Problem
Current magnetic heads face challenges in achieving high recording density and low resistance with ultrathin thickness, as conventional designs struggle to maintain magnetoresistance effects and stable tunneling currents with thin organic molecular layers.
Innovation Solution
The magnetic head incorporates a laminated film structure with a metal magnetic layer, an organic molecule layer, and an inorganic nonmagnetic layer, where the organic molecule layer induces magnetism and the inorganic layer enhances spin filtering, allowing for a thin thickness while achieving low resistance and high magnetoresistance ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic sensor thickness is reduced to read high-density data, then the magnetic head can read information from small recording bits, but the resistance increases and tunneling current becomes unstable
Solution Approach 1:
The patent employs a composite magnetic sensor structure consisting of multiple thin layers including organic molecular layers, inorganic nonmagnetic layers, and magnetic layers. This composite structure allows the sensor to maintain ultrathin overall thickness while incorporating materials with complementary properties that stabilize tunneling current and manage resistance, enabling high-density data reading without sacrificing reliability
Solution Approach 2:
The patent optimizes the thickness parameters of individual layers within the magnetic sensor. By precisely controlling the thickness of organic molecular layers (0.5-2.0 nm), inorganic nonmagnetic layers (1-3 nm), and magnetic layers, the design achieves the right balance between maintaining low resistance for stable tunneling current and keeping the overall sensor thin enough to read high-density data
2Reliability
If the organic molecular layer is made thinner to reduce resistance, then the magnetoresistance effect decreases, but thinner layers are needed for ultrathin magnetic sensor design
Solution Approach 1:
The patent precisely optimizes the thickness parameter of the organic molecular layer within the narrow range of 0.5-2.0 nm. This parameter optimization maintains the layer thin enough for ultrathin sensor design while preserving sufficient magnetoresistance effect. The specific thickness range is determined to balance the competing requirements of low resistance and adequate magnetic signal detection
Solution Approach 2:
The patent combines organic molecular layers with inorganic nonmagnetic layers and magnetic layers to create a composite structure. This composite approach allows the organic layer to be kept thin (maintaining low resistance) while the combined structure preserves the necessary magnetoresistance effect through the interaction of multiple materials with different properties
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 enables the magnetic head to read high-density data with lower resistance than conventional designs, maintaining stable tunneling currents and achieving high magnetoresistance ratios, even with an ultrathin structure.
Implementation Method 1
an organic molecule layer (13) and an inorganic nonmagnetic layer (14), wherein the organic molecule layer (13) induces magnetism
Implementation Method 2
the inorganic layer enhances spin filtering, allowing for a thin thickness while achieving low resistance and high magnetoresistance ratios
Implementation Method 3
information recorded in a magnetic media (hard disk) is read by a magnetoresistance type magnetic head
Data Source
AI summary
A magnetic head includes a first electrode layer, a metal magnetic layer, an organic molecular having a pi conjugated structure, an inorganic layer, and a second electrode layer.