Magnetic Head Spin Tor Oscillator Terminal Configuration

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Solution Overview

Problem

Current magnetic recording and reproducing devices face limitations in increasing recording density due to the anisotropy of magnetic recording media and the generation of high-frequency magnetic fields required for efficient writing.

Innovation Solution

A magnetic head design incorporating a first magnetic layer, an intermediate layer, and a second magnetic layer, where the second magnetic layer is separated from the first magnetic layer, with the intermediate layer between them, and terminals connected to each layer to generate an oscillating high-frequency magnetic field, enhancing recording density by allowing current flow between the intermediate and second magnetic layers without flowing through the first magnetic layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional magnetic head structure is used, then the structure is simple, but the recording density cannot be increased due to limitations in generating high-frequency magnetic fields

Engineering Contradiction:

Improverecording densityVSAvoidmagnetic head structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The magnetic head is divided into three distinct magnetic layers (first magnetic layer, intermediate layer, and second magnetic layer) with different functions. The first and second magnetic layers generate high-frequency magnetic fields for assisted writing, while the intermediate layer provides magnetic coupling and stabilization, enabling increased recording density through functional segmentation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The magnetic head employs a composite magnetic layer structure where each layer has specific magnetic properties optimized for its function. The combination of hard magnetic materials (for stable magnetization) and soft magnetic materials (for high-frequency field generation) creates a composite structure that overcomes the limitations of conventional single-material magnetic heads

Inventive Principle:

Principle #40Composite materials

2Reliability

If high-frequency magnetic fields are generated for efficient writing, then the magnetization orientation is stabilized, but the current path becomes complex requiring separate terminal connections

Engineering Contradiction:

Improvemagnetization stabilityVSAvoidterminal connection configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal connections are arranged in a planar configuration where first and second terminals connect to the first magnetic layer, and third and fourth terminals connect to the second magnetic layer. This two-dimensional terminal arrangement simplifies the connection architecture while enabling independent control of current paths through each magnetic layer for stable magnetization switching

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If the second magnetic layer is separated from the first magnetic layer, then current can flow independently between intermediate and second layers, but the structure becomes more complex

Engineering Contradiction:

Improvecurrent path configurationVSAvoidmagnetic layer structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The intermediate layer serves as a magnetic mediator between the first and second magnetic layers. It provides magnetic coupling while allowing independent current flow paths, enabling the second magnetic layer to be driven independently for assisted writing without directly connecting to the first magnetic layer, thus enhancing adaptability with controlled structural complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

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 high-frequency assisted writing, effectively increasing recording density by generating a high-frequency magnetic field that stabilizes the second magnetic layer's magnetization, allowing for precise orientation of recording bit magnetization on the magnetic recording medium, even with high anisotropy media.

Implementation Method 1

a spin torque oscillator, a first terminal electrically connected to the spin torque oscillator, and a second terminal electrically connected to the spin torque oscillator

Methodology Applied

Scientific EffectSpin torque oscillator:

Implementation Method 2

generate an oscillating high-frequency magnetic field, enhancing recording density by allowing current flow between the intermediate and second magnetic layers without flowing through the first magnetic layer

Methodology Applied

Scientific EffectMagnetic field generation: Electromagnetic Induction

Data Source

PatentUS10424325B2Magnetic head with spin torque oscillator connection configuration

Publication Date: 2019.09.24 KK TOSHIBA

AI summary

According to one embodiment, a magnetic head includes a first magnetic layer, a second magnetic layer, an intermediate layer, a magnetic pole, a first terminal, and a second terminal. The second magnetic layer is separated from the first magnetic layer in a first direction. The intermediate layer is provided between the first magnetic layer and the second magnetic layer. A second direction from the first magnetic layer toward the magnetic pole crosses the first direction. The first terminal is electrically connected to the intermediate layer. The second terminal is electrically connected to the second magnetic layer.