Spin-Orbit Torque Magnetization Rotation Element
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Solution Overview
Problem
Spin-orbit torque magnetization rotational elements, such as XY-type, require high currents and large widths in the Y-direction for magnetization rotation, increasing energy consumption and reducing integration density, while also necessitating external magnetic fields for efficient operation.
Innovation Solution
A spin-orbit torque magnetization rotational element with a first ferromagnetic layer having shape anisotropy and a major axis aligned with the spin-orbit torque wiring layer, where the easy axis of magnetization is inclined relative to both the X and Y directions, allowing magnetization rotation without an external magnetic field and reducing current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the width in the Y direction of the spin-orbit torque wiring layer is increased to enable magnetization rotation, then magnetization rotation can be achieved, but the current density decreases and a larger current is required
Solution Approach 1:
The patent applies asymmetry by inclining the easy axis of magnetization at a specific angle (θ) relative to the X direction, creating an asymmetric magnetic configuration that enables efficient spin-orbit torque action. This asymmetric orientation allows the spin-orbit torque wiring layer to generate sufficient torque for magnetization rotation without requiring increased width or higher currents
Solution Approach 2:
The patent changes the magnetic parameter configuration by setting the easy axis of magnetization at a specific inclination angle θ with respect to the X direction. This parameter change optimizes the spin-orbit torque efficiency, enabling magnetization rotation with reduced current density and without increasing the wiring layer width
2Ease of operation
If the spin-orbit torque wiring layer width in the Y direction is increased, then magnetization rotation is enabled, but the integration density decreases
Solution Approach 1:
By introducing asymmetric orientation of the easy axis of magnetization at angle θ relative to the X direction, the patent achieves effective magnetization rotation within a compact wiring layer width. This asymmetric configuration maximizes the utilization of the spin-orbit torque effect without requiring additional lateral space
Solution Approach 2:
The patent utilizes the angular dimension by inclining the easy axis of magnetization at a specific angle θ with respect to the X direction. This dimensional approach allows magnetization rotation to be achieved through angular optimization rather than lateral expansion, maintaining compact device footprint and high integration density
3Speed
If external magnetic fields are applied to assist magnetization rotation in X-type and Z-type elements, then magnetization rotation speed is improved, but energy consumption and device complexity increase
Solution Approach 1:
The patent configures the Y-type magnetization rotation element where the spin-orbit torque wiring layer itself generates the necessary magnetic field through its current flow, eliminating the need for external magnetic fields. The inclined easy axis orientation enables the spin-orbit torque to directly induce magnetization rotation without external assistance, achieving self-service operation
Solution Approach 2:
The patent extracts and eliminates the external magnetic field component from the system by designing a Y-type element where the spin-orbit torque wiring layer's current generates sufficient internal field for magnetization rotation. This removes the external field requirement, reducing device complexity and energy consumption while maintaining rotation speed
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 efficient magnetization rotation with reduced current flow and without external magnetic fields, enhancing energy efficiency and integration density by aligning the first ferromagnetic layer's major axis with the spin-orbit torque wiring layer and inclining its easy axis, thus minimizing the width of the spin-orbit torque wiring layer.
Implementation Method 1
a pure spin current is generated due to a spin-orbit interaction or a Rashba effect at an interface between different materials
Implementation Method 2
a pure spin current is generated due to a spin-orbit interaction or a Rashba effect at an interface between different materials
Implementation Method 3
This pure spin current induces a spin-orbit torque (SOT) and causes magnetization rotation in a ferromagnetic material disposed on the spin-orbit torque wiring layer due to the SOT
Data Source
AI summary
The spin-orbit torque magnetization rotational element includes a spin-orbit torque wiring layer which extends in an X direction and a first ferromagnetic layer which is laminated on the spin-orbit torque wiring layer. The first ferromagnetic layer has shape anisotropy and has a major axis in the X direction. An easy axis of magnetization of the first ferromagnetic layer is inclined with respect to the X direction and a Y direction orthogonal to the X direction on a plane in which the spin-orbit torque wiring layer extends.