Spin Torque Oscillator Structure Without External Magnetic Field
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Solution Overview
Problem
Conventional spin torque oscillators require a large external magnetic field to generate high-frequency signals, which is difficult to supply effectively.
Innovation Solution
The development of oscillators that utilize a magnetic layer and a magnetization fixing element to induce precession of the magnetic moment without an external magnetic field, using a synthetic antiferromagnet structure and spin transfer torque, allowing for the generation of high-frequency signals through current application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large external magnetic field is applied to generate high-frequency signals, then the oscillation frequency is improved, but the device complexity and power consumption increase due to the difficulty of supplying such large magnetic fields
Solution Approach 1:
The invention extracts and eliminates the external magnetic field supply system from the oscillator structure. By using the magnetization fixing element to provide internal magnetic anisotropy, the patent removes the need for complex external magnetic field generation equipment, thereby reducing device complexity while maintaining high-frequency oscillation capability
Solution Approach 2:
The magnetization fixing element serves a dual function: it fixes the magnetization direction of the magnetic layer and simultaneously provides the magnetic anisotropy needed for high-frequency oscillation. This self-service mechanism eliminates the need for separate magnetic field supply systems, reducing both device complexity and power consumption
2Speed
If a large external magnetic field is applied to generate high-frequency signals, then the oscillation frequency is improved, but the power consumption increases
Solution Approach 1:
The magnetization fixing element provides internal magnetic anisotropy that enables high-frequency oscillation without requiring external magnetic field supply. This self-service approach eliminates continuous power consumption associated with maintaining large external magnetic fields, significantly reducing overall power consumption while maintaining high oscillation frequencies
3Stability of the object's composition
If the magnetization fixing element is added to fix magnetization direction, then the oscillation stability is improved, but the device structure becomes more complex
Solution Approach 1:
The magnetization fixing element merges multiple functions into a single structural component: it fixes the magnetization direction of the magnetic layer, provides magnetic anisotropy for high-frequency oscillation, and serves as part of the synthetic antiferromagnet structure. This merging approach improves oscillation stability while minimizing the increase in device complexity
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 generation of high-frequency signals without the need for an external magnetic field, achieving frequencies similar to those generated by oscillators operated in magnetic fields of 0.1 to 0.5 Tesla, with adjustable oscillation frequency through exchange coupling constants.
Implementation Method 1
An exchange coupling constant between the magnetic layer and the magnetization fixing element may be smaller than an exchange coupling constant between the second fixed layer and the second antiferromagnetic layer
Implementation Method 2
spin torque oscillators using a spin transfer torque phenomenon have been introduced
Implementation Method 3
the oscillator is configured to generate a signal by using precession of a magnetic moment of the magnetic layer
Data Source
AI summary
Oscillators and method of operating the same are provided, the oscillators include a magnetic layer, and a magnetization fixing element configured to fix a magnetization direction of the magnetic layer. The oscillators generate a signal by using precession of a magnetic moment of the magnetic layer.