Magnetic Head Stacked Body with Iridium Layer for High Density Recording

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Solution Overview

Problem

Current magnetic heads face challenges in increasing recording density due to difficulties in effectively applying the magnetic field to the recording medium, especially when reducing the write gap to enhance resolution.

Innovation Solution

A magnetic head design incorporating a stacked body with a magnetic layer, a first nonmagnetic conductive layer including Ir, and a second nonmagnetic conductive layer, which allows for the effective orientation of the magnetic field towards the recording medium by reversing the magnetization of the magnetic layer, even when the write gap is reduced.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the write gap is reduced to enhance resolution, then recording density is improved, but the magnetic field application effectiveness deteriorates

Engineering Contradiction:

Improverecording densityVSAvoidmagnetic field application effectiveness

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent introduces a magnetic layer between the magnetic pole and shield that can reverse its magnetization direction. When the write gap is reduced, this magnetic layer inverts its magnetic polarity to compensate for the weakened magnetic field penetration, thereby maintaining effective magnetic field application to the recording medium while achieving higher recording density

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the magnetic parameters of the system by introducing a controllable magnetic layer with switchable magnetization direction. By adjusting the magnetization state of this intermediate layer, the magnetic field distribution and penetration effectiveness are optimized for reduced write gap configurations, enabling high-density recording without sacrificing field application reliability

Inventive Principle:

Principle #35Parameter changes

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 recording density by ensuring the magnetic field is effectively applied to the recording medium, even at reduced write gaps, thereby improving the magnetic recording and reproducing efficiency.

Implementation Method 1

a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, wherein the first conductive layer includes Ir

Methodology Applied

Scientific EffectSpin torque:

Data Source

PatentUS10950259B2Magnetic head and magnetic recording and reproducing device

Publication Date: 2021.03.16 KK TOSHIBA

AI summary

According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.