Coplanar Thin-Film Magnetic Electrodes Antiparallel Alignment

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Solution Overview

Problem

Existing thin-film magnetic devices face challenges in controllably generating antiparallel magnetization alignment between adjacent magnetic electrodes, particularly at nanometer-scale separations and lateral arrangements, which is more difficult than achieving parallel alignment.

Innovation Solution

A magnetic device design featuring coplanar thin-film magnetic electrodes with oval shapes and small edge-to-edge separation, including tapers and an active element in the gap, allows for controllable magnetization alignment by applying an external magnetic field, enabling both parallel and antiparallel states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If two magnetic electrodes are arranged laterally adjacent with nanometer-scale separation to achieve compact device structure, then device integration density is improved, but the difficulty of generating antiparallel magnetization alignment increases significantly

Engineering Contradiction:

Improvedevice integration densityVSAvoiddifficulty of generating antiparallel magnetization alignment

Core Design Contradiction:

Area of moving objectVSEase of manufacture

Solution Approach 1:

A nonmagnetic spacer layer is introduced between the two ferromagnetic layers to mediate their magnetic interaction. This spacer layer enables antiparallel magnetization alignment through exchange coupling or dipolar interaction while maintaining nanometer-scale separation, solving the problem of difficult antiparallel alignment in laterally adjacent electrodes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetic anisotropy parameters of the ferromagnetic layers are engineered through material selection and thickness control. By adjusting the easy axis of magnetization and using perpendicular magnetic anisotropy materials, the system achieves stable antiparallel alignment at nanometer separations where conventional in-plane anisotropy would fail

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If two magnetic electrodes are stacked vertically to simplify magnetization alignment control, then the ease of generating parallel and antiparallel states is improved, but the device structure becomes less compact

Engineering Contradiction:

Improveease of generating magnetization alignmentVSAvoiddevice compactness

Core Design Contradiction:

Ease of operationVSArea of moving object

Solution Approach 1:

The patent transitions from vertical stacking to lateral arrangement by introducing a thin nonmagnetic spacer, effectively using the lateral dimension to achieve compact integration while maintaining controllable magnetic interaction through the spacer-mediated coupling

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Length of moving object

If the separation between magnetic electrodes is reduced to nanometer-scale to improve device miniaturization, then device size is reduced, but the precision required for magnetization control increases

Engineering Contradiction:

Improveelectrode separation distanceVSAvoidmagnetization control precision

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The nonmagnetic spacer layer acts as a precision-controlled intermediary that decouples the magnetic electrodes, allowing nanometer-scale separation to be achieved with standard fabrication tolerances. The spacer thickness controls the interaction strength, providing robust magnetization control despite small dimensional variations

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

The device effectively achieves controllable magnetization states, allowing for precise manipulation of magnetization vectors between magnetic electrodes, enhancing the functionality of thin-film magnetic devices.

Implementation Method 1

When subjected to an appropriate external magnetic field, the magnetic electrodes can advantageously be magnetized to controllably enter parallel and antiparallel magnetization states

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS20170372826A1Magnetization alignment in a thin-film device

Publication Date: 2017.12.28 NOKIA OF AMERICA CORP

AI summary

We disclose a magnetic device having a pair of coplanar thin-film magnetic electrodes arranged on a substrate with a relatively small edge-to-edge separation. In an example embodiment, the magnetic electrodes have a substantially identical footprint that can be approximated by an ellipse, with the short axes of the ellipses being collinear and the edge-to-edge separation between the ellipses being smaller than the size of the short axis. In some embodiments, the magnetic electrodes may have relatively small tapers that extend toward each other from the ellipse edges in the constriction area between the electrodes. Some embodiments may also include an active element inserted into the gap between the tapers and electrical leads connected to the magnetic electrodes for passing electrical current through the active element. When subjected to an appropriate external magnetic field, the magnetic electrodes can advantageously be magnetized to controllably enter parallel and antiparallel magnetization states.