3D Twisted Racetrack Ribbons for Magnetic Domain Wall Control
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Solution Overview
Problem
Conventional electronic devices are limited in their ability to control and manipulate magnetic domain walls, which is essential for advanced functionalities like neuromorphic devices and logic operations, due to their 2D geometry, necessitating a shift towards 3D geometries to enhance magnetic property manipulation.
Innovation Solution
Implementing a curvilinear 3D structure on magnetic racetrack ribbons with torsion angles of 1-70° and angle increases per unit length of 0.5-60° to interact with magnetic moments and ordering, allowing for precise control of domain wall flow and dynamic magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 2D geometry is used in magnetic devices, then manufacturing is simpler, but the ability to manipulate magnetic domain walls and control magnetic properties is limited
Solution Approach 1:
The patent transitions from conventional 2D planar magnetic ribbons to 3D curvilinear geometries including twisted ribbons, helical structures, and toroidal configurations. This dimensional escalation enables new magnetic domain wall manipulation mechanisms that are impossible in flat geometries, directly resolving the contradiction by sacrificing some manufacturing simplicity for vastly improved adaptability in controlling magnetic properties.
Solution Approach 2:
The patent employs curved and twisted geometric structures such as twisted ribbons with controlled torsion angles, helical paths, and toroidal shapes. These curvilinear geometries create spatially varying magnetic anisotropy and enable sophisticated domain wall dynamics including chiral domain wall motion and topologically protected states, thereby enhancing manipulative capability despite increased structural complexity.
2Ease of operation
If 3D curvilinear structures are imposed on magnetic ribbons, then dynamic magnetic properties such as driving torque and domain wall velocity can be controlled, but the manufacturing precision requirements increase
Solution Approach 1:
The patent systematically varies geometric parameters such as torsion angles (ranging from small deviations to full 360-degree twists), curvature radii, and pitch distances in helical structures. By tuning these parameters, the patent achieves precise control over magnetic domain wall velocity, driving torque, and threshold currents, demonstrating that parameter optimization can achieve desired magnetic control while managing manufacturing precision requirements.
Solution Approach 2:
The patent applies different curvilinear geometries to specific regions of the magnetic ribbon rather than uniformly throughout. For example, twisted sections are placed only where domain wall manipulation is needed, while other regions remain straight or have different curvature profiles. This localized application of complex geometries reduces overall manufacturing complexity while maintaining the ability to control dynamic magnetic properties where required.
3Adaptability or versatility
If curvilinear 3D structures are used to enable advanced device functions, then device functionality is enhanced, but the manufacturing process becomes more difficult
Solution Approach 1:
The patent implements advanced device functions such as domain wall diodes, filters, and logic gates by transitioning to 3D curvilinear geometries. These three-dimensional structures enable functionalities that are fundamentally impossible in 2D planar configurations, directly addressing the need for enhanced device versatility despite the challenge of manufacturing complex shapes.
Solution Approach 2:
The patent uses curved and twisted magnetic ribbon structures to create spatially varying magnetic landscapes that enable advanced functionalities. The curvature and torsion of the ribbon structure generate position-dependent magnetic anisotropy and domain wall pinning sites, allowing for device functions such as directional domain wall motion, frequency filtering, and logical operations without requiring additional complex components.
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
Enables the implementation of devices such as neuromorphic devices, DW diodes, filters, and multiplexers by altering driving torque, velocity, and threshold currents, facilitating precise stepwise motion and selective nucleation of domain walls.
Implementation Method 1
adjacent magnetic domains with out-of-plane and in-plane magnetizations are coupled with a fixed chirality via the interfacial Dzyaloshinskii-Moriya interaction (DMI)
Implementation Method 2
one can use 3D geometry driven effects in magnetic racetrack ribbons to implement abstract operations that are fundamental for digital computation
Data Source
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AI summary
The present invention relates to a method for manipulating domain walls (DWs) in a magnetic ribbon, which method comprises imposing a curvilinear 3D structure upon at least one region of the magnetic ribbon. Moreover, the invention relates to a curvilinear 3D magnetic ribbon, which extends between two ends and which has at least one twisted region between its two ends wherein the twisted region exhibits an absolute torsion angle over its length of 1-70°, and the torsion angle has an increase per unit length of 0.5-60°.