Heusler Insertion Layers for Low-Damping PMA Magnetic Memory
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Solution Overview
Problem
Magnetic materials with perpendicular magnetic anisotropy (PMA) used in magnetic memories face challenges with high magnetic damping, leading to increased switching currents and pulse widths, which are undesirable for dense memory applications.
Innovation Solution
Incorporating a resistive insertion layer with a specific lattice mismatch and thickness to reduce magnetic damping in Heusler compounds, while maintaining perpendicular magnetic anisotropy, by using a templating structure to template the Heusler compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Heusler compounds are used as magnetic layers with perpendicular magnetic anisotropy, then magnetic memory performance is improved, but magnetic damping increases leading to higher switching currents
Solution Approach 1:
A nonmagnetic spacer layer with specific thickness (0.5-2 nm) is introduced between the Heusler compound magnetic layer and the substrate. This intermediary layer reduces spin current scattering and minimizes magnetic damping, thereby lowering the switching current required for magnetic state transitions while maintaining the perpendicular magnetic anisotropy that enables reliable memory operation
Solution Approach 2:
The thickness of the nonmagnetic spacer layer is precisely controlled within the range of 0.5-2 nm to optimize the balance between reducing magnetic damping and maintaining structural stability. This parameter optimization enables reduced switching currents while preserving the perpendicular magnetic anisotropy essential for memory reliability
2Reliability
If Heusler compounds with perpendicular magnetic anisotropy are used, then memory performance is improved, but pulse width increases which is undesirable for dense memory applications
Solution Approach 1:
The nonmagnetic spacer layer acts as a mediator that reduces magnetic damping in the Heusler compound layer, enabling faster magnetization switching. This results in narrower pulse widths required for writing memory states, which is critical for achieving high-density memory applications where fast switching is essential
Solution Approach 2:
By optimizing the spacer layer thickness to 0.5-2 nm, the magnetic damping is reduced sufficiently to achieve narrow pulse widths while maintaining the perpendicular magnetic anisotropy. This parameter control enables the system to meet the timing requirements for dense memory applications
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
Reduces magnetic damping, allowing for lower switching currents and narrower pulse widths, thereby improving the performance of magnetic junctions and memories.
Implementation Method 1
US 2020 / 0013429 A1 discloses a spin transfer torque (STT) device... The intermediate oxide layer reflects spin current from the free layer and thus reduces undesirable damping of the oscillation of the free layer's magnetization by the seed layer
Implementation Method 2
The magnetic layer includes a Heusler compound and has a perpendicular magnetic anisotropy energy exceeding an out-of-plane demagnetization energy
Data Source
Figure 1A~1C
Figure 2A
Figure 2B
AI summary
A magnetic structure (100A, 100B, 100C), a magnetic device incorporating the magnetic structure and a method for providing the magnetic structure are described. The magnetic structure includes a magnetic layer (130), a templating structure (110A, 110B, 110C) and a resistive insertion layer (120). The magnetic layer includes a Heusler compound and has a perpendicular magnetic anisotropy energy exceeding an out-of-plane demagnetization energy. The templating structure has a crystal structure configured to template at least one of the Heusler compound and the resistive insertion layer. The magnetic layer is on the templating structure. The resistive insertion layer is configured to reduce magnetic damping for the Heusler compound and allow for templating of the Heusler compound.