Microwave Assisted Magnetic Recording Head Spin Wave Suppression

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Solution Overview

Problem

In microwave-assisted magnetic recording heads, the interaction between the recording magnetic pole and the spin torque oscillator leads to suppressed oscillation, making reliable microwave-assisted magnetic recording difficult due to induced spin waves.

Innovation Solution

Incorporating an anti-ferromagnetic layer between the write shield magnetic pole and the spin torque oscillator, along with a non-magnetic metal layer between the spin torque oscillator and the anti-ferromagnetic layer, to suppress spin wave induction and enhance oscillation efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a spin torque oscillator is disposed between the main magnetic pole and the write shield magnetic pole to generate microwaves, then microwave-assisted magnetic recording is enabled, but spin waves are induced in the magnetic pole due to magnetic field interaction, suppressing oscillation and reducing reliability

Engineering Contradiction:

Improvereliable microwave-assisted magnetic recordingVSAvoidspin wave induction

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

A non-magnetic metal layer is introduced as an intermediary between the spin torque oscillator and the write shield magnetic pole. This intermediate layer prevents direct magnetic field interaction between the oscillator and the magnetic pole, thereby suppressing spin wave induction while allowing the oscillator to function properly for microwave-assisted magnetic recording

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The structure is segmented by introducing a non-magnetic metal layer that separates the spin torque oscillator from the write shield magnetic pole. This segmentation isolates the magnetic field interaction, preventing harmful spin wave induction in the magnetic pole while maintaining the oscillator's microwave generation capability

Inventive Principle:

Principle #1Segmentation

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 stable and efficient microwave-assisted magnetic recording by improving microwave oscillation efficiency and maintaining reliable recording performance.

Implementation Method 1

a spin torque oscillator which is used as a microwave generator is disposed between a main magnetic pole and a write shield magnetic pole, and a microwave is applied from the spin torque oscillator to the magnetic disk

Methodology Applied

Scientific EffectSpin transfer torque:

Implementation Method 2

Methodology Applied

Scientific EffectAnti-ferromagnetism:

Data Source

PatentUS9355659B2Microwave assisted magnetic recording head and magnetic recording device having the same

Publication Date: 2016.05.31 KK TOSHIBA

AI summary

A magnetic recording head includes a main magnetic pole in which a recording magnetic field is generated, a write shield magnetic pole disposed alongside the main magnetic pole with a gap therebetween, a spin torque oscillator disposed within the gap and configured to generate a microwave, an anti-ferromagnetic layer disposed within the gap between the write shield magnetic pole and the spin torque oscillator, and a non-magnetic metal layer disposed within the gap between the spin torque oscillator and the anti-ferromagnetic layer.